CN113872619A - Radio frequency front-end device, radio frequency transceiving system and communication equipment - Google Patents

Abstract

The present application discloses a radio frequency front-end device, a radio frequency transceiver system, and a communication device. By integrating an external pre-set low-frequency filter into the radio frequency front-end device, the integration degree is improved and the occupied mainboard area is reduced; The improvement of the integration level also reduces the cost; in addition, through integration, the matching between the various parts can be realized within the device, which reduces the port mismatch and improves the performance of the radio frequency transceiver system and communication equipment.

Description

RF front-end devices, RF transceiver systems and communication equipment

technical field

This application relates to, but is not limited to, radio frequency technology, especially a radio frequency front-end device, a radio frequency transceiver system, and a communication device.

Background technique

With the development and progress of technology, 5G mobile communication technology has gradually begun to be applied to electronic devices. N28 is a low-frequency band of 5G. N28 has low wireless frequency, relatively long wavelength, strong diffraction ability, and greater coverage. It will become an important low-frequency coverage of China's 5G network. In order to increase the download rate of the low-frequency network, it is necessary to obtain a larger throughput by configuring a multiple-input multiple-output (MIMO, Multi-input Multi-output) for the low-frequency network. In order to meet the requirements of the 5G LB MIMO function, more discrete components are required, which will inevitably lead to very tight space layout and wiring of the motherboard PCB, thereby reducing product performance.

SUMMARY OF THE INVENTION

The present application provides a radio frequency front-end device, a radio frequency transceiver system, and a communication device, which can improve the integration degree of the radio frequency device and improve product performance.

An embodiment of the present application provides a radio frequency front-end device (also referred to as a first radio frequency front-end device), which is provided with a first low-frequency transmitting port, at least one receiving port, a first low-frequency antenna port, and at least one external low-frequency frequency expansion port. One auxiliary transmit port, at least one auxiliary transceiver port and at least two auxiliary receive ports; wherein, the auxiliary transmit port and the auxiliary transceiver port are connected through an external circuit in a one-to-one correspondence; the radio frequency front-end device includes:

a first transmitting circuit, connected to the first low-frequency transmitting port and at least one auxiliary transmitting port, and used for amplifying the first low-frequency signal in the plurality of low-frequency signals from the first low-frequency transmitting port and outputting it through the auxiliary transmitting port ;

The first receiving circuit, with built-in at least one preset low-frequency filter, is connected to the receiving port and at least two auxiliary receiving ports, and is used for amplifying and outputting the second low-frequency signal from the auxiliary receiving port connected to the external circuit to the receiving port, and filtering and amplifying the third low-frequency signal from the auxiliary receiving port through the built-in preset low-frequency filter and outputting it to the receiving port;

A switch circuit, a plurality of first ends of the switch circuit are respectively connected to the first transmitting circuit, the first receiving circuit and at least one auxiliary transceiver port, and the second end of the switch circuit is connected to the first low-frequency antenna port for selectively conducting the a radio frequency path between the transmitting circuit, the receiving circuit and the at least one auxiliary transceiver port and the first low frequency antenna port respectively;

Wherein, the first low frequency signal, the second low frequency signal and the third low frequency signal are signals of the same preset low frequency.

In an exemplary example, the radio frequency front-end device is a radio frequency LB L-PA Mid device.

Embodiments of the present application further provide a radio frequency front-end device (also referred to as a second radio frequency front-end device), which is provided with at least two receiving ports, a second low-frequency antenna port for connecting to a low-frequency antenna, and an external frequency band extension At least two auxiliary low-frequency receiving ports and at least one low-frequency receiving port; the radio frequency front-end device includes:

The second receiving circuit, with built-in at least two preset low-frequency filters, is connected to the receiving port and the at least two auxiliary low-frequency receiving ports, and is used for passing the fifth low-frequency signal from the auxiliary low-frequency receiving port through a built-in preset low-frequency filter The filter performs filtering and amplifying processing and outputs it to the receiving port, and the fourth low-frequency signal from the low-frequency receiving port via the RF line is filtered and amplified by another preset low-frequency filter and output to the receiving port. ;

The second switch circuit, the multiple first ends of the second switch circuit are respectively connected to the second receiving circuit and at least one low frequency receiving port, and the second end of the second switch circuit is connected to the second low frequency antenna port for selectively conducting The second receiving circuit and the radio frequency path between the at least two low frequency receiving ports and the first low frequency antenna port respectively;

Wherein, the fourth low frequency band signal and the fifth low frequency band signal are signals of the same preset low frequency band.

In an exemplary example, the radio frequency front-end device is a low-frequency front-end module LFEM device.

The present application further provides a radio frequency transceiver system, including: a first antenna, a second antenna, a third antenna, a fourth antenna, a radio frequency transceiver, an external circuit, the first radio frequency front-end device described in any one of the above, and any of the above The second radio frequency front-end device of one item; wherein,

The radio frequency transceiver is connected to the first antenna through the first radio frequency front-end device and an external circuit, and constitutes a transmitting channel of low-frequency signals including at least the first low-frequency signal and a main set receiving channel of low-frequency signals including at least the second low-frequency signal ;

The radio frequency transceiver is connected to the second antenna through the first radio frequency front-end device, and forms a main set multiple-input multiple-output MIMO receiving channel of low-frequency signals including at least the second low-frequency signal;

The radio frequency transceiver is connected to the third antenna through the second radio frequency front-end device, and forms a diversity receiving channel of the low frequency signal including at least the fourth low frequency signal;

The radio frequency transceiver is connected to the fourth antenna via the second radio frequency front-end device, to form a diversity MIMO receiving channel of the low-frequency signal at least including the fifth low-frequency signal;

The first low-frequency signal, the second low-frequency signal, the third low-frequency signal, the fourth low-frequency signal, and the fifth low-frequency signal are signals of the same preset low-frequency frequency.

Embodiments of the present application further provide a communication device, including the radio frequency transceiver system described in any one of the above.

By using the RF front-end device provided by the embodiments of the present application, external filter components are no longer required, the PCB occupied area is reduced, the integration degree of the RF device is improved, and the cost is reduced, and after integration, the RF front-end device can be implemented inside the RF front-end device. The matching between the parts reduces the port mismatch, thereby improving the performance of the radio frequency transceiver system and communication equipment.

Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification. They are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

FIG. 1 is a schematic structural diagram of a first embodiment of a radio frequency front-end device in an embodiment of the application;

FIG. 2 is a schematic structural diagram of a second embodiment of a radio frequency front-end device in an embodiment of the application;

3 is a schematic structural diagram of a third embodiment of a radio frequency front-end device in an embodiment of the application;

4 is a schematic structural diagram of a first embodiment of a radio frequency LB L-PA Mid device in an embodiment of the application;

5 is a schematic structural diagram of a second embodiment of a radio frequency LB L-PA Mid device in an embodiment of the application;

6 is a schematic structural diagram of a third embodiment of a radio frequency LB L-PA Mid device in an embodiment of the application;

7 is a schematic structural diagram of a fourth embodiment of a radio frequency LB L-PA Mid device in an embodiment of the application;

FIG. 8 is a schematic structural diagram of a fourth embodiment of a radio frequency front-end device in an embodiment of the application;

9 is a schematic structural diagram of a fifth embodiment of a radio frequency front-end device in an embodiment of the application;

FIG. 10 is a schematic structural diagram of the first embodiment of the LFEM device in the embodiment of the application;

FIG. 11 is a schematic structural diagram of the second embodiment of the LFEM device in the embodiment of the application;

12 is a schematic structural diagram of a third embodiment of an LFEM device in an embodiment of the present application;

13 is a schematic structural diagram of the fourth embodiment of the LFEM device in the embodiment of the present application;

14 is a schematic structural diagram of a first embodiment of a radio frequency transceiver system in an embodiment of the application;

FIG. 15 is a schematic structural diagram of a second embodiment of a radio frequency transceiver system in an embodiment of the application;

16 is a schematic structural diagram of a third embodiment of a radio frequency transceiver system in an embodiment of the application;

17 is a schematic structural diagram of a fourth embodiment of a radio frequency transceiver system in an embodiment of the application;

FIG. 18 is a schematic structural diagram of a fifth embodiment of a radio frequency transceiver system according to an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, the embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other if there is no conflict.

In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. Embodiments of the present application are presented in the accompanying drawings. However, the application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application.

It can be understood that the terms "first" and "second" used in this application are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

It can be understood that the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between them.

As used herein, the singular forms "a," "an," and "the/the" can include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the terms "comprising/comprising" or "having" etc. designate the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more Possibilities of other features, integers, steps, operations, components, parts or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

FIG. 1 is a schematic structural diagram of a first embodiment of a radio frequency front-end device in an embodiment of the application. As shown in FIG. 1 , the radio frequency front-end device is provided with a first low-frequency transmit port 4G LB RFIN, at least two receive ports LNA OUT, a first A low-frequency antenna port LB ANT, at least one auxiliary transmit port LB TXOUT, at least one auxiliary transceiver port LB_TRX, and at least two auxiliary receive ports LNA_AUX for external low-frequency band extension; wherein, the auxiliary transmit port LB TXOUT and the auxiliary transmit and receive port LB_TRX pass through The external circuits are connected in one-to-one correspondence; the RF front-end device shown in Figure 1 at least includes:

The first transmitting circuit 110 is connected to the first low frequency transmitting port 4G LB RFIN and at least one auxiliary transmitting port LBTXOUT, and is configured to perform the first low frequency signal of the plurality of low frequency signals from the first low frequency transmitting port 4G LB RFIN. Amplify and output through the auxiliary transmit port LB TXOUT;

The first receiving circuit 120, with built-in at least one preset low-frequency filter, is connected with at least two receiving ports LNA OUT and at least two auxiliary receiving ports LNA_AUX, and is used for the second receiving circuit from the auxiliary receiving port LNA_AUX connected with the external circuit. The low-frequency signal is amplified and output to the receiving port LNA OUT, and the third low-frequency signal from the auxiliary receiving port LNA_AUX is filtered and amplified by the built-in preset low-frequency filter and output to the receiving port LNA OUT;

The first switch circuit 130. Multiple first ends of the first switch circuit 130 are respectively connected to the first transmit circuit 110, the first receive circuit 120 and at least one auxiliary transceiver port LB_TRX, and the second ends of the first switch circuit 130 are connected to the first transmit circuit 110, the first receive circuit 120 and at least one auxiliary transceiver port LB_TRX. A low-frequency antenna port LB ANT is connected to selectively conduct the radio frequency path between the first transmitting circuit 110, the first receiving circuit 120 and the at least one auxiliary transceiver port LB_TRX and the first low-frequency antenna port LB ANT;

Wherein, the first low frequency signal, the second low frequency signal and the third low frequency signal are signals of the same preset low frequency.

In an exemplary example, the first transmit circuit 110 is also connected to the first ends of the first switch circuit 130 in a one-to-one correspondence, for dividing the first low frequency band from the first low frequency transmit port 4G LB RFIN The multiple low-frequency signals other than the signal are amplified and output to the first switch circuit 130; the first receiving circuit 120 is also connected to the multiple first ends of the first switch circuit 130 in a one-to-one correspondence, and is used for receiving signals from the switch circuit 130. The multiple low frequency signals of the circuit 130 are amplified and output to the receiving port LNA OUT.

The RF front-end device provided by the embodiment shown in FIG. 1 of the present application supports the reception and transmission of low-frequency signals of multiple different frequency bands, and supports filtering processing of externally-connected preset low-frequency signals, so that multiple low-frequency signals can be processed. Receive switching control, transmit switching control, and switching control between transmit and receive. The plurality of low-band signals may include low-band signals of different frequency bands among 4G signals, 5G NR signals, or 6G signals. Exemplarily, the frequency bands of the multiple low frequency signals include at least B8, B12, B20, B26 frequency bands and a preset low frequency band, and the preset low frequency band may include but not limited to one or any combination of the following: N28, N5, N8 and other frequency bands . In one embodiment, the first low-frequency signal, the second low-frequency signal, and the third low-frequency signal may be signals in the N28 or N5 or N8 frequency bands.

It should be noted that the naming of the device ports in the embodiments of the present application and the accompanying drawings is only an identification, and is not used to limit the functions of the ports, that is, it is not used to limit the protection scope of the present application. For example, the name of the first low frequency transmission port is 4G LB RFIN, but it does not mean that the first low frequency transmission port can only be used for transmission in the 4G LB frequency band, and can also be applied to the 5G LB frequency band.

The RF front-end device shown in FIG. 1 can be understood as a package structure. As shown in FIG. 1 , the RF front-end device is provided with a first low-frequency transmitting port 4G LB RFIN for connecting to a radio frequency transceiver, at least two receiving ports LNA OUT, It is connected to the first low frequency antenna port LB ANT of the low frequency antenna, and at least one auxiliary transmit port LB TXOUT, at least one auxiliary transmit and receive port LB_TRX and at least two auxiliary receive ports LNA_AUX for external frequency band extension. Among them, the receiving port LNA OUT, the first low frequency transmitting port 4G LB RFIN, the first low frequency antenna port LB ANT, the auxiliary transmitting port LBTXOUT, the auxiliary transmitting and receiving port LB_TRX and the auxiliary receiving port LNA_AUX can be understood as the radio frequency pin terminals of the radio frequency front-end device, Used to connect with various external devices. In one embodiment, the receiving port LNA OUT and the first low-frequency transmitting port 4G LB RFIN can be used to connect with a radio frequency transceiver; the first low-frequency antenna port LB ANT can be used to connect to an antenna, and the radio frequency front-end device can be processed after processing. The multiple low-frequency signals of the antenna are output to the antenna, and the low-frequency signals received by the antenna can also be transmitted to the radio frequency front-end device; the auxiliary transmit port LB TXOUT and the auxiliary transceiver port LB_TRX can be connected one-to-one through an external circuit.

In an exemplary example, the external circuit is a switching circuit, and the switching circuit is respectively connected to the plurality of auxiliary transmit ports LB TXOUT, the plurality of auxiliary transmit and receive ports LB_TRX, and the plurality of auxiliary receive ports LNA_AUX. In one embodiment, the switching circuit may include a plurality of preset low-band duplexers.

In an exemplary example, as shown in FIG. 1 , the radio frequency front-end device may include: a first transmitting circuit 110 , a first receiving circuit 120 with a built-in preset low-frequency filter, and a first switching circuit 130 .

In an exemplary example, as shown in FIG. 1 , the input end of the first transmitting circuit 110 is connected to the first low frequency transmitting port 4G LB RFIN, and performs multiple low frequency signals received by the first low frequency transmitting port 4G LB RFIN on the first low frequency transmitting port 4G LB RFIN. Amplification processing; the output end of the first transmitting circuit 110 includes: a plurality of output ports connected to the first ends of the first switching circuit 130 in one-to-one correspondence, and at least one auxiliary transceiver with the first switching circuit 130 through an external circuit The ports LB_TRX correspond to at least one auxiliary transmit port LB TXOUT connected in a one-to-one correspondence.

In an embodiment, the first transmitting circuit 110 may amplify the multiple low frequency signals received by the first low frequency transmitting port 4G LB RFIN, wherein the first low frequency of the preset low frequency among the multiple low frequency signals After the frequency band signal is amplified, it is output through the corresponding auxiliary transmission port LB TXOUT, and the other low frequency signals are amplified and output to the switch circuit. In one embodiment, the first transmit circuit 110 may be provided with multiple transmit paths to support the transmit of multiple low frequency signals. Exemplarily, the frequency band corresponding to the low frequency band signal may at least include, for example, B8, B12, B20, B26 frequency bands and a preset low frequency band. In an embodiment, the transmit path may include: a transmit path formed by the first low frequency transmit port 4G LBRFIN, the first transmit circuit 110, the first switch circuit 130, the first low frequency antenna port LB ANT, and the first low frequency transmit The port 4G LB RFIN, the transmitting circuit 110, an external circuit (such as a preset low-frequency duplexer), the first switch circuit 130, and the first low-frequency antenna port LB ANT constitute a transmitting path together.

In an exemplary example, as shown in FIG. 1 , the first receiving circuit 120 is respectively connected with the first switching circuit 130 , the receiving port LNA OUT and the auxiliary receiving port LNA_AUX. The output end of the first receiving circuit 120 is connected to the receiving port LNAOUT. The input terminals of the first receiving circuit 120 include: a plurality of input ports connected to the first terminals of the first switching circuit 130 in a one-to-one correspondence, and at least two auxiliary receiving ports LNA_AUX connected to an external circuit. The first receiving circuit 120 amplifies the low-frequency signals from the plurality of input ports and the second low-frequency signal of the preset low frequency from the auxiliary receiving port LNA_AUX connected to the external circuit and outputs it to a receiving port LNA OUT, and , filter, amplify, and output the third low frequency signal of the preset low frequency band from the auxiliary transmit port LB TXOUT to a receive port LNA OUT. In this embodiment, the auxiliary receiving port LNA_AUX not only receives the second low frequency band signal from the external circuit, but also receives the radio frequency signal from the external external frequency band. In this embodiment, the third low-frequency signal is filtered by the preset low-frequency filter built in the first receiving circuit 120 , which reduces the number of external filter devices and improves the integration of the device.

The first receiving circuit 120 in this embodiment supports receiving control of any of the aforementioned low-frequency signals. In an embodiment, the auxiliary receiving port LNA_AUX may be used to receive at least low frequency signals of the N28 frequency band. In one embodiment, the first receiving circuit 120 may be provided with multiple receiving paths to support the receiving of multiple low-frequency frequency signals. In one embodiment, the receiving path may include: a receiving path jointly formed by the first low frequency antenna port LB ANT, the first switching circuit 130, the first receiving circuit 120, and any receiving port LNA OUT, and the first low frequency antenna port LB ANT, the first switch circuit 130, an external circuit (such as a preset low frequency duplexer), the first receiving circuit 120, the receiving path formed by any receiving port LNA OUT, and the auxiliary receiving port LNA_AUX, the first receiving circuit The preset low-frequency filter in 120, the first receiving circuit 120, and any receiving port LNA OUT jointly constitute a receiving path. That is, a receiving channel can be set for the low-frequency signal of each frequency band to support the receiving and processing of multiple low-frequency signals.

In one embodiment, the external circuit may be a preset low-band duplexer, an auxiliary transmit port LBTXOUT is correspondingly connected to an auxiliary transceiver port LB_TRX through the preset low-band duplexer, and the preset low-band duplexer The device is also connected to an auxiliary receiving port LNA_AUX, so that the preset low frequency duplexer realizes the isolation of the transmit signal of the preset low frequency band and the received signal of the preset low frequency band. In an embodiment, the external circuit includes a first preset low-band duplexer and a second preset low-band duplexer, and an auxiliary transmit port LB TXOUT communicates with an auxiliary transceiver through the first preset low-band duplexer The port LB_TRX is correspondingly connected, and the first preset low frequency duplexer is also connected with an auxiliary receiving port LNA_AUX, so as to realize the isolation of the transmitted signal of the first preset low frequency band and the received signal of the first preset low frequency band; One auxiliary transmit port LB TXOUT is correspondingly connected to another auxiliary transceiver port LB_TRX through a second preset low frequency duplexer, and the second preset low frequency duplexer is also connected to another auxiliary receiving port LNA_AUX, so as to realize the Isolation of the transmit signal of the second preset low frequency band and the received signal of the second preset low frequency band.

In an exemplary example, as shown in FIG. 1 , multiple first ends of the first switch circuit 130 are respectively connected to the first transmit circuit 110 , the first receive circuit 120 and at least one auxiliary transceiver port LB_TRX. The second end of the first switch circuit 130 is connected to the first low-frequency antenna port LB ANT, and the first switch circuit 130 is used to selectively turn on the first transmit circuit 110, the first receive circuit 120 and at least one auxiliary transceiver port LB_TRX respectively and the A radio frequency path between the low frequency antenna ports LB ANT.

The RF front-end device shown in FIG. 1 of the present application no longer needs external filter components, which reduces the PCB footprint, improves the integration of the RF device, and reduces the cost. After integration, it can be implemented inside the RF front-end device. The matching between the parts reduces port mismatch and improves product performance.

FIG. 2 is a schematic structural diagram of a second embodiment of a radio frequency front-end device in an embodiment of the present application. As shown in FIG. 2 , in an exemplary example, the radio frequency front-end device in an embodiment of the present application is further provided with coupling output ports CPLOUT and The coupling input port CPLIN, the radio frequency front-end device further includes a coupling circuit 140, which is arranged in the radio frequency path between the first switch circuit 130 and the first low frequency antenna port LB ANT, and is used for coupling the low frequency signal in the radio frequency path to be coupled The output port CPLOUT outputs the coupled signal. The coupled signal can be used to measure the forward coupling power and the reverse coupling power of the low frequency signal. The coupling input port CPLIN can be used to connect with other external radio frequency front-end devices with the coupling output port CPLOUT, and is used to receive the coupling signal output by other external radio frequency front-end devices. The coupling output port CPLOUT is output to realize the transmission of other external coupling signals.

FIG. 3 is a schematic structural diagram of a third embodiment of the radio frequency front-end device in the embodiment of the application. As shown in FIG. 3 , in an exemplary example, the radio frequency front-end device is further provided with a second low-frequency transmitting port 2G LB RFIN, a high-frequency transmitting port The port 2GHBIN and the high-frequency output port 2G HB OUT, the radio frequency front-end device further includes a second transmitting circuit 150 and a third transmitting circuit 160 . In one embodiment, the second transmit circuit 150 includes a power amplifier, and the third transmit circuit 160 includes a power amplifier.

The input end of the second transmitting circuit 150 is connected to the second low-frequency transmitting port 2G LB RFIN, and the output end of the second transmitting circuit 150 is connected to a first end of the first switching circuit 130, and is used for receiving 2G low-frequency signals. Perform amplification processing; among them, the low-frequency signals are 4G signals and 5G signals. The input end of the third transmitting circuit 160 is connected to the high frequency transmitting port 2GHB IN, and the output end of the third transmitting circuit 160 is connected to the high frequency output port 2G HB OUT for amplifying the received 2G high frequency signal.

In an embodiment, by setting the power amplifier included in the second transmission circuit 150, the transmission control of the low frequency signal of the 2G signal can be realized. By setting the power amplifier included in the third transmitting circuit 160, the transmission control of the high frequency signal of the 2G signal can be realized.

The radio frequency front-end device in the embodiment of the present application may be a low-band power amplifier module with a built-in low-noise amplifier (LB L-PA Mid, Low Band PA Mid With LNA), also referred to as a LB L-PA Mid device. A radio frequency front-end (RFFE, Radio Frequency Front-End) chip is a core component that realizes the communication function of a mobile phone and various mobile terminals. The LB L-PA Mid device provided in the embodiment of the present application can be used for the main set of antenna radio frequency links.

FIG. 4 is a schematic structural diagram of a first embodiment of a radio frequency LB L-PA Mid device in an embodiment of the application. As shown in FIG. 4 , the radio frequency LB L-PA Mid device is provided with a first low frequency transmit port for connecting to a radio frequency transceiver 4G LB RFIN, at least two receive ports LNA OUT, a first low frequency antenna port LB ANT for connecting a low frequency antenna, and at least one auxiliary transmit port LB TXOUT for external frequency band extension, at least one auxiliary transmit and receive port LB_TRX, and at least one auxiliary transmit and receive port LB_TRX Two auxiliary receive ports LNA_AUX. Among them, the receiving port LNA OUT, the first low frequency transmitting port 4G LB RFIN, the first low frequency antenna port LB ANT, the auxiliary transmitting port LB TXOUT, the auxiliary transmitting and receiving port LB_TRX and the auxiliary receiving port LNA_AUX can be understood as the radio frequency LB L-PA Mid device. RF pin terminals for connection to various external devices. In an embodiment, the receiving port LNA OUT and the first low frequency transmitting port 4G LB RFIN can be used to connect with the radio frequency transceiver; the first low frequency antenna port LB ANT can be used to connect to the antenna, and the radio frequency LB L-PA can be used for connecting The multiple low-frequency signals processed by the Mid device are output to the antenna, and the low-frequency signals received by the antenna can also be transmitted to the radio frequency LB L-PA Mid device; the auxiliary transmit port LB TXOUT and the auxiliary transceiver port LB_TRX can pass the external circuit ( The external circuit is also connected to the auxiliary receiving port LNA_AUX. In this way, the external circuit can be used to isolate the preset low-frequency transmission signal and the preset low-frequency receiving signal to ensure Receiving and transmitting work normally.

In an exemplary example, at least one auxiliary transmit port LB TXOUT may be used to transmit signals of preset low frequency bands such as N28, N8, and N5.

In an exemplary example, as shown in FIG. 4 , the first transmit circuit 110 may at least include: a first power amplifier 111 and a first switch unit 112 ; wherein the input end of the first power amplifier 110 is connected to the first low frequency transmit The port 4G LBRFIN is connected, and the output end of the first power amplifier 110 is connected to a first end of the first switching unit 112, which is used for the first low frequency signal of the plurality of low frequency signals received through the first low frequency transmitting port 4G LB RFIN. The frequency band signal is subjected to power amplification processing; part of the second end of the first switching unit 112 is correspondingly connected to at least one auxiliary transmit port LB TXOUT for outputting the amplified first low frequency band signal to the external circuit 10 . In an embodiment, the first transmitting circuit 110 may further include: a plurality of first filtering units 1131 , and another part of the second end of the first switching unit 112 is connected to the first switching circuit 130 through a first filtering unit 1131 respectively. , which is used to filter low-frequency signals except the first low-frequency signal among the plurality of low-frequency signals amplified and processed by the first power amplifier 111 and output to the first switch circuit 130 .

In an exemplary example, as shown in FIG. 4 , the first transmitting circuit 110 may include a first power amplifier 111 , a first switching unit 112 and a plurality of first filtering units 1131 . The input end of the first power amplifier 111 is connected to the first low frequency transmission port 4G LB RFIN, and the output end of the first power amplifier 111 is connected to a first end of the first switch unit 112 . Part of the second ends of the first switch unit 112 are respectively connected to the first switch circuit 130 via a first filter unit 1131 , that is, part of the second ends of the first switch unit 112 correspond to one end of a first filter unit 1131 The other end of each first filter unit 1131 is correspondingly connected to the first switch circuit 130, and part of the second end of the first switch unit 112 is corresponding to at least one auxiliary transmission port LB TXOUT (which can be denoted as LB TXOUT1, LB TXOUT2, LBTXOUT3 and LB TXOUT4) are connected. In an embodiment, the part of the first switching unit 112 corresponding to the second end connected to one end of a first filtering unit 1131 may include four, respectively corresponding to frequency bands such as B12, B8, B20, and B26. In an embodiment, the part of the first switch unit 112 corresponding to the second ends connected to the at least one auxiliary transmit port LB TXOUT may include four, and one of the second ends corresponds to the N28 frequency band.

Wherein, on the one hand, the first power amplifier 111 can perform power amplification processing on multiple low-frequency signals received through the first low-frequency transmission port 4G LB RFIN, and then the low-frequency signals processed by the first power amplifier 111 can be processed by the first power amplifier 111. The switching unit 112 is transmitted to each of the first filtering units 1131 . The first filtering unit 1131 is configured to perform filtering processing on the low-frequency signal, and the frequency bands of the low-frequency signal output by each first filtering unit 1131 are different. It can be understood that the filtering paths in the multiple transmitting paths are independent of each other and do not overlap with each other. The first filtering unit 1131 may correspondingly include a filter, the filter only allows the low frequency signal of the corresponding frequency band to pass. Exemplarily, the frequency bands of the multiple low-frequency frequency signals include four different frequency bands of B12, B8, B20, and B26, and four first filtering units 1131 (ie, four filters) can be set correspondingly to realize the Filtering of low frequency signals. On the other hand, the first power amplifier 111 may perform power amplification processing on the preset low frequency band signal received through the first low frequency transmission port 4G LB RFIN, and then the preset low frequency band signal processed by the first power amplifier 111 is processed by the first power amplifier 111. A switch unit 112 transmits to the corresponding auxiliary transmit port LB TXOUT. Exemplarily, the preset frequency band of the low frequency band signal may include the N28 frequency band. Correspondingly, the first switch unit 112 may be an SP8T switch, wherein the first end of the SP8T switch is connected to the output end of the first power amplifier 111 . Four of the second ends of the SP8T switch are connected to the four first filter units 1131 in a one-to-one correspondence. After the filtering processing of the four first filter units 1131, four corresponding outputs such as B12, B8, B20 and B26 can be output. The low frequency signal is sent to the first switch circuit 130 . The remaining four second ends of the SP8T switch can be connected to the four auxiliary transmit ports LB TXOUT in a one-to-one correspondence, and output the preset low frequency signal to the first switch circuit 130 through an external circuit correspondingly connected to the auxiliary transmit ports LB TXOUT.

In an embodiment, the transmit path may include: a first low frequency transmit port 4G LB RFIN, a first power amplifier 111, a first switch unit 112, a first filter unit 1131, a first switch circuit 130, and a first low frequency antenna port A transmission path formed by LBANT, and the first low frequency transmission port 4G LB RFIN, the first power amplifier 111, the first switch unit 112, the auxiliary transmission port LB TXOUT, an external circuit (such as a preset low frequency duplexer) , another transmission path formed by the first switch circuit 130 and the first low frequency antenna port LB ANT.

In an exemplary example, the first receiving circuit 120 may include: a first low noise amplifier 124, a second low noise amplifier 125, a second switch unit 122, a third switch unit 123, a fourth switch unit 126, a first Preset low frequency filter 121; wherein,

A second end of the second switch unit 122 or the third switch unit 123 is connected to the auxiliary receiving port LNA_AUX via the first preset low frequency filter 121, and is used for filtering the third low frequency signal and outputting it to the auxiliary receiving port LNA_AUX. The first low noise amplifier 124 or the second low noise amplifier 125; the other second end of the second switch unit 122 or the third switch unit 123 is connected to another auxiliary receiving port LNA_AUX for outputting the second low frequency signal to the the first low noise amplifier 124 or the second low noise amplifier 125;

After the first low-noise amplifier 124 or the second low-noise amplifier 125 respectively amplifies the received low-frequency signal, the signal is output to the receiving port LNA OUT through the fourth switch unit 126 .

In an exemplary example, the first receiving circuit 120 may further include a plurality of second filtering units 1132 . The input end of each second filter unit 1132 is connected to the first switch circuit 130 correspondingly; the output end of each second filter unit 1132 is corresponding to a second end of the second switch unit 122 or the third switch unit 123 The connection is used for filtering the received low-frequency signal, and the frequency bands of the low-frequency signal output by each second filtering unit 1132 are different.

In an exemplary example, as shown in FIG. 4 , the first receiving circuit 120 is connected with two receiving ports LNA OUT (respectively denoted as LNA OUT1 and LNA OUT2 ), four auxiliary receiving ports LNA_AUX (respectively denoted as LNA OUT2 ) LNA_AUX1, LNA_AUX2, LNA_AUX3, and LNA_AUX4). In an embodiment, the first receiving circuit 120 may include: a first low noise amplifier 124, a second low noise amplifier 125, a second switch unit 122, a third switch unit 123, a fourth switch unit 126, a first preset Low frequency band filter 121 and a plurality of second filtering units 1132 . In one embodiment, the fourth switch unit 126 may be a DPDT switch, and the second switch unit 122 and the third switch unit 123 are both SP4T switches. The two first ends of the fourth switch unit 126 are connected to the two receiving ports LNA OUT in a one-to-one correspondence, and the two second ends of the fourth switch unit 126 are connected to the first low-noise amplifier 124, the second low-noise amplifier 124 and the second low-noise amplifier 126. The output terminal of the noise amplifier 125 is connected. The single terminal of the second switch unit 122 is connected to the input terminal of the first low noise amplifier 124 , the two second terminals of the second switch unit 122 are respectively connected to the two second filter units 1132 in one-to-one correspondence, and the second switch unit 122 The two second ends are respectively connected to the two auxiliary receiving ports LNA_AUX (LNA_AUX1 and LNA_AUX2 in FIG. 4 ) in a one-to-one correspondence. Wherein, the two second filtering units 1132 connected to the two second ends of the second switching unit 122 may include two filters for filtering the two low frequency signals B26 and B8 respectively. The single terminal of the third switch unit 123 is connected to the input terminal of the second low noise amplifier 125 , the two second terminals of the third switch unit 123 are respectively connected to the two second filter units 1132 in one-to-one correspondence, and the third switch unit 123 A second end of the third switch unit 123 is connected to an auxiliary receiving port LNA_AUX (as shown in FIG. 4 ) through the first preset low frequency filter 121, and a second end of the third switching unit 123 is connected to an auxiliary receiving port LNA_AUX (as shown in FIG. 4 ) 4 in the LNA_AUX4) connection. Wherein, the two second filtering units 1132 connected to the two second ends of the third switching unit 123 may include two filters for filtering the two low frequency signals B12 and B20 respectively. It should be noted that, in the embodiment of the present application, the second filter unit 1132 connected to the second switch unit 122 and the third switch unit 123 respectively is not further limited, and can be set according to actual needs. Wherein, the second filtering units 1132 are respectively used for filtering the received low-frequency signals, and the frequency bands of the low-frequency signals output by each of the second filtering units 1132 are different. The functions of the second filtering unit 1132 and the first filtering unit 1131 are the same, which will not be repeated here.

In one embodiment, the receive path may include: the first low frequency antenna port LB ANT, the first switch circuit 130, the second switch unit 122 or the third switch unit 123, the first low noise amplifier 124 or the second low noise amplifier 125, a fourth switch unit 126, a receiving path formed by any receiving port LNA OUT, and a first low frequency antenna port LB ANT, a first switch circuit 130, an external circuit (such as a preset low frequency duplexer) , another receiving path formed by the second switch unit 122 or the third switch unit 123, the first low noise amplifier 124 or the second low noise amplifier 125, the fourth switch unit 126, and any receiving port LNA OUT, and, Auxiliary receiving port LNA_AUX, first preset low frequency filter 121, second switch unit 122 or third switch unit 123, first low noise amplifier 124 or second low noise amplifier 125, fourth switch unit 126, any receiving Another receiving path formed by the port LNA OUT.

In an exemplary example, as shown in FIG. 4 , the first switch circuit 130 includes a fifth switch unit 131 . In one embodiment, the fifth switch unit 131 may be a multi-channel selection switch 131 such as SP9T. Part of the first ends of the fifth switching unit 131 are respectively connected to the plurality of first filtering units 1131 and the plurality of second filtering units 1132 in a one-to-one correspondence. Part of the ports to which the second filtering unit 1132 is connected in a one-to-one correspondence includes four, corresponding to frequency bands B12, B8, B20, and B26 respectively. Part of the first ends of the fifth switch unit 131 are respectively connected to a plurality of auxiliary transceiver ports LB_TRX (such as LB_TRX1 , LB_TRX2 , LB_TRX3 , and LB_TRX4 in FIG. 4 ) in a one-to-one correspondence.

It should be noted that, in the embodiments of the present application, the switch units in the figures are only some examples, and are not used to limit the number and types of switches included in the switch units. The switch units in the embodiments of the present application can be based on The number of circuits it is connected to is set.

In an exemplary example, the radio frequency LB L-PA Mid device is further provided with a coupling output port CPLOUT, and the radio frequency LB L-PA Mid device further includes a coupling circuit 140, which is provided at the fifth switch unit 131 and the first low frequency antenna port LBANT In the radio frequency path between them, it is used to couple the low frequency signal in the radio frequency path, so as to output the coupled signal through the coupling output port CPLOUT.

In an exemplary example, the radio frequency LB L-PA Mid device is further provided with a second low frequency transmit port 2G LBRFIN, a high frequency transmit port 2G HB IN and a high frequency output port 2G HB OUT, and the radio frequency LB L-PA Mid device further includes The second transmitting circuit 150 and the third transmitting circuit 160 , wherein the second transmitting circuit 150 includes a second power amplifier 151 , and the third transmitting circuit 160 includes a third power amplifier 161 .

The input end of the second power amplifier 151 is connected to the second low-frequency transmitting port 2G LB RFIN, and the output end of the second power amplifier 151 is connected to a first end of the fifth switch unit 131 for receiving 2G low-frequency signals. Perform amplification processing; among them, the low-frequency signals are 4G signals and 5G signals. The input end of the third power amplifier 161 is connected to the high frequency transmitting port 2G HB IN, and the output end of the third power amplifier 161 is connected to the high frequency output port 2G HB OUT for amplifying the received 2G high frequency signal. In an embodiment, by setting the second power amplifier 150, the transmission control of the low frequency signal of the 2G signal can be realized. By setting the third power amplifier 160, the transmission control of the high frequency band signal of the 2G signal can be realized.

In an exemplary example, the radio frequency LB L-PA Mid device may further include: a first controller 170 and a second controller 180 . The first controller 170 is respectively connected to each switch unit and each power amplifier in the radio frequency LB L-PA Mid device, and is used to control the on-off of each switch unit and control the working state of each power amplifier. The second controller 180 may be connected to each of the low-noise amplifiers for adjusting the gain coefficient of each of the low-noise amplifiers.

The first controller 170 and the second controller 180 may be Mobile Industry Processor Interface (MIPI, Mobile Industry Processor Interface)-RF Front End Control Interface (RFFE, RF Front End Control Interface) control units or RF Front End Control Interface (RFFE, RF Front Control Interface) End Control Interface) control unit, which conforms to the control protocol of the RFFE bus. When the first controller 170 and the second controller 180 are MIPI-RFFE control units or RFFE control units, the radio frequency LB L-PA Mid device is further provided with an input pin CLK for a clock signal, an input for a uni/bidirectional data signal or Bidirectional pin SDATAS, power supply pin VDD, reference voltage pin VIO, etc., are used to control the power amplifier, each switch unit and low noise amplifier in the RF LBL-PA Mid device.

Based on the development trend of miniaturization of mainboards of terminal equipment, an embodiment of the present application provides a radio frequency LB L-PAMid device, the composition of which is shown in FIG. 4 . The whole chip integrates multi-band transmit and receive channels, including B8, B12, B20, B26 and 2G LB and 2G HB GSM, and 4 auxiliary ports for the expansion of external frequency bands such as N28 frequency band.

FIG. 5 is a schematic structural diagram of the second embodiment of the radio frequency LB L-PA Mid device in the embodiment of the application. In FIG. 5, an external circuit is used as the preset low-frequency duplexer 10 and the combiner 82 as an example. In this embodiment, the preset low-band duplexer 10 may be an N28 duplexer. In the embodiment shown in FIG. 5 , one of the output ports of the preset low frequency duplexer 10 is connected to an auxiliary transmit port LB TXOUT4 for outputting a plurality of low frequency signals from the first low frequency transmit port 4G LB RFIN The first low-frequency signal in The duplexer 10 ; the other output port of the preset low frequency duplexer 10 is connected to an auxiliary receiving port LNA_AUX1 for outputting the received second low frequency signal of the preset low frequency band to the first receiving circuit 120 . In one embodiment, a first end of the combiner 82 is connected to an auxiliary receiving port LNA_AUX3 for outputting the received third low frequency signal of the preset low frequency to the first receiving circuit 120 . A preset low frequency filter 121 .

Based on the RF LB L-PA Mid device shown in Figure 4 and Figure 5, the transceiver control of any low frequency signal and preset low frequency signal can be realized. Exemplarily, the implementation of the low-frequency signal in the B12 frequency band and the low-frequency signal in the preset low frequency band N28 is used as an example for description.

The transmission path of the B12 frequency band is as follows:

The first low frequency transmit port 4G LB RFIN → the first power amplifier 111 → the first switch unit 112 → the B12TX channel → the first filter unit 1131 → the contact 5 of the multi-channel selection switch 131 → the contact 0 of the multi-channel selection switch 131 → The first low frequency antenna port LB ANT.

The receive path of the B12 frequency band is as follows:

The first low frequency antenna port LB ANT→contact 0 of the multi-channel selection switch 131→contact 5 of the multi-channel selection switch 131→the second filter unit 1132→B12 RX path→the third switch unit 123→the second low noise amplifier 125 →Contact 4 of the fourth switch unit 126→The fourth switch unit 126 switches to the contact 2→Receive port LNA OUT2→RF transceiver.

The transmission path of the first low-frequency signal of the N28 frequency band is as follows:

First low frequency transmit port 4G LB RFIN→first power amplifier 111→first switch unit 112→auxiliary transmit port LB TXOUT4→one output port of N28 duplexer 10→common port of N28 duplexer 10→auxiliary transceiver port LB_TRX4 →Contact 4 of the multi-channel selection switch 131→Contact 0 of the multi-channel selection switch 131→First low frequency antenna port LB ANT.

The receiving path of the second low frequency signal of the N28 frequency band is as follows:

The first low frequency antenna port LB ANT→contact 0 of the multi-channel selection switch 131→contact 4 of the multi-channel selection switch 131→auxiliary transceiver port LB_TRX4→common port of the N28 duplexer 10→the other of the N28 duplexer 10 Output port→auxiliary receive port LNA_AUX1→second switch unit 122→first low noise amplifier 124→contact 3 of fourth switch unit 126→fourth switch unit 126 switches to contact 1→receive port LNA OUT1→RF transceiver .

The receiving path of the third low-band signal of the N28 frequency band is as follows:

The third low frequency band signal from the combiner 82 → the auxiliary receiving port LNA_AUX3 → the N28 filter 121 → the second RF switch 123 → the second low noise amplifier 125 → the contact 4 of the fourth switch unit 126 → the fourth switch unit 126 Switch to Contact 2 → Receive Port LNA OUT2 → RF Transceiver.

In one embodiment shown in FIG. 4 and FIG. 5 , the first preset low-frequency filter 121 is arranged at the front end of the third switch unit 123 , and is connected to the third switch unit 123 through the contact 3 of the third switch unit 123 , namely the first The connection of a preset low frequency filter 121 to the auxiliary receiving port LNA_AUX3 is only an embodiment, and is not used to limit the setting position of the first preset low frequency filter 121 . In one embodiment, the first preset low-frequency filter 121 may be disposed at the front end of the third switch unit 123 , and the third switch unit 123 is connected through the contact 4 of the third switch unit 123 . In an embodiment, the first preset low frequency filter 121 may be disposed at the front end of the second switch unit 122 , and is connected to the second switch unit 122 through the contact 3 of the second switch unit 122 . In an embodiment, the first preset low frequency filter 121 may be disposed at the front end of the second switch unit 122 , and the second switch unit 122 is connected to the second switch unit 122 through the contact 4 of the second switch unit 122 . When the position where the first preset low-frequency filter 121 is set is changed, it is only necessary to relocate the internal circuit of the device.

For example, FIG. 6 is a schematic structural diagram of a third embodiment of a radio frequency LB L-PA Mid device according to an embodiment of the application. As shown in FIG. 6 , the first preset low-frequency filter 121 is disposed at the front end of the second switch unit 122 , the second switch unit 122 is connected through the contact 3 of the second switch unit 122. In this case, the implementation of the low frequency signal of the B12 frequency band and the low frequency signal of the preset low frequency band N28 is still used as an example for description.

The transmit path and receive path of the B12 frequency band have not changed, and the transmit path of the first low-frequency signal of the N28 frequency band has not changed either.

The receiving path of the second low frequency signal of the N28 frequency band is as follows:

The first low frequency antenna port LB ANT→contact 0 of the multi-channel selection switch 131→contact 4 of the multi-channel selection switch 131→auxiliary transceiver port LB_TRX4→common port of the N28 duplexer 10→the other of the N28 duplexer 10 Output port→auxiliary receive port LNA_AUX3→third switch unit 123→second low noise amplifier 125→contact 4 of fourth switch unit 126→fourth switch unit 126 switches to contact 2→receive port LNA OUT2→RF transceiver .

The receiving path of the third low-band signal of the N28 frequency band is as follows:

The third low frequency band signal from the combiner 82 → the auxiliary receiving port LNA_AUX1 → the N28 filter 121 → the first RF switch 122 → the first low noise amplifier 124 → the contact 3 of the fourth switch unit 126 → the fourth switch unit 126 Switch to Contact 1 → Receive Port LNA OUT1 → RF Transceiver.

For example, FIG. 7 is a schematic structural diagram of a fourth embodiment of a radio frequency LB L-PA Mid device according to an embodiment of the present application. As shown in FIG. 7 , the first preset low frequency filter 121 is disposed at the front end of the second switch unit 122 , the second switch unit 122 is connected through the contact 4 of the second switch unit 122 . In this case, the implementation of the low frequency signal of the B12 frequency band and the low frequency signal of the preset low frequency band N28 is still used as an example for description.

The transmit path and receive path of the B12 frequency band have not changed, and the transmit path of the first low-frequency signal of the N28 frequency band has not changed either.

The receiving path of the second low frequency signal of the N28 frequency band is as follows:

The first low frequency antenna port LB ANT→contact 0 of the multi-channel selection switch 131→contact 4 of the multi-channel selection switch 131→auxiliary transceiver port LB_TRX4→common port of the N28 duplexer 10→the other of the N28 duplexer 10 Output port→auxiliary receive port LNA_AUX4→third switch unit 123→second low noise amplifier 125→contact 4 of fourth switch unit 126→fourth switch unit 126 switches to contact 2→receive port LNA OUT2→RF transceiver .

The receiving path of the third low-band signal of the N28 frequency band is as follows:

The third low frequency band signal from the combiner 82 → the auxiliary receiving port LNA_AUX2 → the N28 filter 121 → the first RF switch 122 → the first low noise amplifier 124 → the contact 3 of the fourth switch unit 126 → the fourth switch unit 126 Switch to Contact 1 → Receive Port LNA OUT1 → RF Transceiver.

FIG. 8 is a schematic structural diagram of a fourth embodiment of a radio frequency front-end device according to an embodiment of the application. As shown in FIG. 8 , the radio frequency front-end device is provided with at least two receiving ports LNA OUT (LB OUT and LMHB OUT in FIG. 8 ) , a second low-frequency antenna port LB ANT for connecting a low-frequency antenna, and at least two auxiliary low-frequency receiving ports AUX_LB and at least one low-frequency receiving port LB_RX for external frequency band expansion. The receiving port LNA OUT, the first low-frequency antenna port LBANT, the auxiliary low-frequency receiving port AUX_LB, and the low-frequency receiving port LB_RX can be understood as the radio frequency pin terminals of the radio frequency front-end device, which are used for connection with various external devices. In one embodiment, the receiving port LNA OUT can be used to connect with the radio frequency transceiver; the first low frequency antenna port LB ANT can be used to connect to the antenna, and can transmit the low frequency signals received by the antenna to the radio frequency front-end device; The receiving port LB_RX can be used to transmit the received radio frequency signal to the auxiliary low frequency receiving port AUX_LB through the radio frequency line; the auxiliary low frequency receiving port AUX_LB can also be used to receive the external radio frequency signal. The RF front-end device shown in Figure 8 includes at least:

The second receiving circuit 220 has built-in at least two preset low frequency filters, and is connected to the receiving port LNA OUT and at least two auxiliary low frequency receiving ports AUX_LB, and is used for receiving the fourth low frequency signal from the low frequency receiving port LB_RX via the radio frequency line A built-in preset low-frequency filter is used to filter and amplify and output to the receiving port LNAOUT. The fifth low-frequency signal from the auxiliary low-frequency receiving port AUX_LB is filtered and amplified by another built-in preset low-frequency filter. Process and output to the receiving port LNA OUT;

The second switch circuit 230, a plurality of first terminals of the second switch circuit 230 are respectively connected to the second receiving circuit 220 and at least two low frequency receiving ports LB_RX, and the second terminal of the second switch circuit 230 is connected to the second low frequency antenna port LB ANT connection, for selectively conducting the radio frequency path between the second receiving circuit 220 and the at least two low frequency receiving ports LB_RX and the first low frequency antenna port LB ANT;

Wherein, the fourth low frequency band signal and the fifth low frequency band signal are signals of the same preset low frequency band.

The RF front-end device provided by the embodiment shown in FIG. 8 of the present application supports the reception of multiple low-frequency signals in different frequency bands and supports filtering processing of externally connected preset low-frequency signals, so as to realize the communication between multiple low-frequency signals. Receive switch control. The plurality of low-band signals may include low-band signals of different frequency bands among 4G signals, 5G NR signals, or 6G signals. Exemplarily, the frequency bands of the multiple low frequency signals include at least B8, B12, B20, B26 frequency bands and a preset low frequency band, and the preset low frequency band may include but not limited to one or any combination of the following: N28, N5, N8 and other frequency bands . In one embodiment, the fourth low frequency band signal and the fifth low frequency band signal may be signals in the N28 or N5 or N8 frequency bands.

In an exemplary example, as shown in FIG. 8 , the radio frequency front-end device may include: a second receiving circuit 220 and a second switching circuit 230 with two built-in preset low-frequency filters.

In an exemplary example, as shown in FIG. 8 , the second receiving circuit 220 is connected to the second switching circuit 230 , the receiving port LNA OUT and the auxiliary low-frequency receiving port AUX_LB, respectively. The output end of the second receiving circuit 220 is connected to the receiving port LNA OUT. The input terminals of the second receiving circuit 220 include: multiple input ports connected to the multiple first terminals of the second switching circuit 230 in a one-to-one correspondence, and at least one auxiliary low-frequency receiving port AUX_LB connected to an external circuit. The second receiving circuit 220 performs filtering, amplifying processing on the low frequency signals from the multiple input ports and the fourth low frequency signal and the fifth low frequency signal of the preset low frequency from the auxiliary low frequency receiving port AUX_LB, and outputs it to a receiver port. In this embodiment, the fourth low-frequency signal and the fifth low-frequency signal are filtered through the two built-in preset low-frequency filters in the second receiving circuit 220, thereby reducing the number of external filter components and improving the performance of the components. Integration.

The second receiving circuit 120 in this embodiment supports receiving control of any of the aforementioned low-frequency signals. In one embodiment, the auxiliary low frequency receiving port AUX_LB may be used to receive at least low frequency signals of the N28 frequency band. In one embodiment, the second receiving circuit 220 may be provided with multiple receiving paths to support the receiving of multiple low frequency signals. In one embodiment, the receiving path may include: a receiving path jointly formed by the second low-frequency antenna port LB ANT, the second switching circuit 230, the second receiving circuit 220, and any receiving port LNA OUT, and the second low-frequency antenna port LB ANT, the second switch circuit 230, the low-frequency receiving port LB_RX, the auxiliary low-frequency receiving port AUX LB, the preset low-frequency filter in the second receiving circuit 220, the second receiving circuit 120, and any receiving port LNA OUT are composed together. A receiving path, and a receiving path jointly formed by the auxiliary low-frequency receiving port AUX LB, the preset low-frequency filter in the second receiving circuit 220, the second receiving circuit 220, and any receiving port LNA OUT. That is, a receiving channel can be set for the low-frequency signal of each frequency band to support the receiving and processing of multiple low-frequency signals.

In an exemplary example, as shown in FIG. 8 , the multiple first ends of the second switch circuit 230 are respectively connected to the second receiving circuit 220 and the low-frequency receiving port LB_RX, respectively. The second end of the second switch circuit 230 is connected to the second low frequency antenna port LB ANT, and the second switch circuit 230 is used to selectively conduct between the second receiving circuit 120 and the low frequency receiving port LB_RX and the second low frequency antenna port LB ANT, respectively the radio frequency path.

The RF front-end devices shown in Figures 8 and 9 of the present application no longer require external filter components, which reduces the PCB footprint, improves the integration of RF devices, and reduces costs. The matching between the parts can be realized, the port mismatch is reduced, and the product performance is improved.

In an exemplary example, as shown in FIG. 9 , the RF front-end device is further provided with: a third antenna port MHB ANT for connecting a mid-to-high frequency antenna, and a plurality of auxiliary mid-to-high frequency receiving ports for external frequency band expansion AUX_MHB and multiple medium and high frequency receiving ports RX; the RF front-end device further includes: a third receiving circuit 240 and a third switching circuit 250 for supporting diversity receiving and processing of multiple intermediate frequency signals and multiple high frequency signals.

As shown in FIG. 9, in an exemplary example, the RF front-end device shown in FIG. 8 may also be provided with five receiving ports OUT (OUT1, OUT2, OUT3, OUT4 and OUT5 in FIG. 9) for Connect the third antenna port MHB ANT of the mid-high frequency antenna, as well as seven auxiliary mid-high frequency receiving ports AUX_MHB and two mid-high frequency receiving ports RX for external frequency band expansion. Among them, the receiving port OUT, the third antenna port MHB ANT, the auxiliary receiving port AUX_MHLB and the two receiving ports RX can be understood as the radio frequency pin terminals of the radio frequency front-end device, which are used for connection with various external devices. As shown in FIG. 9 , the radio frequency front-end device further includes: a third receiving circuit 240 and a third switching circuit 250 for supporting diversity receiving and amplifying processing of multiple intermediate frequency signals and multiple high frequency signals. As shown in Figure 10, the mid- and high-frequency processing part of the RF front-end device shown in Figure 9 integrates multiple low-noise amplifiers, filters, switches and other components to realize the transceiver processing of multiple mid- and high-frequency 4G signals. The 4G signals in the middle and high frequency bands may at least include signals in frequency bands such as B4, B66, B1, B25, B3, B32, B34, B39, B30, B7, B40, and B41.

In an embodiment, the RF front-end device shown in FIG. 9 can be understood as a package structure, and the RF front-end device is provided with at least two receiving ports LNA OUT and a second low-frequency antenna port LB ANT for connecting a low-frequency antenna, And at least two auxiliary low frequency receiving ports AUX_LB and at least two low frequency receiving ports LB_RX for external frequency band extension, five receiving ports OUT, a third antenna port MHB ANT for connecting mid-high frequency antennas, and for external Seven auxiliary mid-to-high frequency receive ports AUX_MHB and two mid-to-high frequency receive ports RX for frequency band extension. The receiving port LNA OUT, the second low frequency antenna port LB ANT, the auxiliary low frequency receiving port AUX_LB, the low frequency receiving port LB_RX, the receiving port OUT, the third antenna port MHB ANT, the auxiliary medium and high frequency receiving port AUX_MHB and the medium and high frequency receiving port RX may be It is understood as the RF pin terminal of the RF front-end device, which is used to connect with various external devices.

The RF front-end devices shown in Figures 8 and 9 of the present application no longer require external filter components, which reduces the PCB footprint, improves the integration of RF devices, and reduces costs. The matching between the parts can be realized, the port mismatch is reduced, and the product performance is improved.

The radio frequency front-end device in the embodiment of the present application may be a low-frequency front-end module (LFEM, L Frontend Module) device, which may be used for a diversity antenna radio frequency link.

FIG. 10 is a schematic structural diagram of the first embodiment of the LFEM device in the embodiment of the application. As shown in FIG. 10 , the LFEM device is provided with at least two receiving ports LNA OUT (LB OUT and LMHB OUT in FIG. A second low-frequency antenna port LB ANT for connecting a low-frequency antenna, and at least two auxiliary low-frequency receiving ports AUX_LB and at least two low-frequency receiving ports LB_RX for external frequency band expansion. The receiving port LNA OUT, the first low-frequency antenna port LB ANT, the auxiliary low-frequency receiving port AUX_LB, and the low-frequency receiving port LB_RX can be understood as the radio frequency pin terminals of the LFEM device, which are used to connect with external devices. In one embodiment, the receiving port LNA OUT can be used to connect with the radio frequency transceiver; the first low frequency antenna port LB ANT can be used to connect to the antenna, and can transmit the low frequency signals received by the antenna to the radio frequency front-end device; The receiving port LB_RX can be used to transmit the received radio frequency signal to the auxiliary low frequency receiving port AUX_LB through the radio frequency line; the auxiliary low frequency receiving port AUX_LB can also be used to receive the external radio frequency signal.

In an exemplary example, the second receiving circuit 220 may at least include: a third low noise amplifier 225, a fourth low noise amplifier 226, a sixth switching unit 223, a seventh switching unit 224, an eighth switching unit 227, a Two preset low-frequency filters 221, and a third preset low-frequency filter 222; wherein,

A second end of the sixth switch unit 223 or the seventh switch unit 224 is connected to the auxiliary low-frequency receiving port AUX_LB via the second preset low-frequency filter 221 for filtering the fifth low-frequency signal and outputting it To the third low noise amplifier 225 or the fourth low noise amplifier 226; the other second end of the sixth switch unit 223 or the seventh switch unit 224 passes through the third preset low frequency filter 222 and another auxiliary low frequency receiving port AUX_LB connected to filter the fourth low-frequency signal and output it to the third low-noise amplifier 225 or the fourth low-noise amplifier 226;

The single terminals of the sixth switch unit 223 and the seventh switch unit 224 are respectively connected to the input ends of the third low noise amplifier 225 and the fourth low noise amplifier 226; the third low noise amplifier 225 or the fourth low noise amplifier 226 respectively After the received low-frequency signal is amplified, it is output to the receiving port LNA OUT through the eighth switch unit 227 .

In an exemplary example, the second receiving circuit 220 further includes: a plurality of third filtering units 2232;

The input end of each third filter unit 2232 is correspondingly connected to the second switch circuit 230; the output end of each third filter unit 2232 is correspondingly connected to a second end of the sixth switch unit 223 or the seventh switch unit 224, for The received low-frequency signal is filtered, and the frequency band of the low-frequency signal output by each second filtering unit 2232 is different.

In an exemplary example, as shown in FIG. 10 , the second receiving circuit 220 is connected with two receiving ports LNAOUT (respectively denoted as LB OUT and LMHB OUT), and four auxiliary low-frequency reception ports AUX_LB (respectively denoted as LMHB OUT) AUX_LB2, AUX_LB1, AUX LB_28+20 and AUX LB_28). In an embodiment, the second receiving circuit 220 may include: a third low noise amplifier 225, a fourth low noise amplifier 226, a sixth switch unit 223, a seventh switch unit 224, an eighth switch unit 227, a second preset A low frequency filter 221 , a third preset low frequency filter 222 and a plurality of third filtering units 2232 . In one embodiment, the eighth switch unit 227 may be a DPDT switch, and the sixth switch unit 223 and the seventh switch unit 224 are both SP4T switches. The two first ends of the eighth switch unit 227 are connected to the receiving port LB OUT and the receiving port LMHB OUT in one-to-one correspondence, and the two second ends of the eighth switch unit 227 are connected to the third low-noise amplifier 225, The output terminal of the fourth low noise amplifier 226 is connected. The single terminal of the sixth switch unit 223 is connected to the input terminal of the third low noise amplifier 225 , the two second terminals of the sixth switch unit 223 are respectively connected to the two third filter units 2232 in one-to-one correspondence, and the sixth switch unit 223 A second end is connected to an auxiliary low frequency receiving port AUX_LB (AUXLB_28+20 in FIG. 10 , a second end of the sixth switching unit 223 is connected to an auxiliary low frequency receiving port AUX_LB through the third preset low frequency filter 222 (AUX LB_28 in FIG. 10 ). Wherein, the two third filtering units 2232 connected to the two second ends of the sixth switching unit 223 may include two low-frequency signals for B12/B13 and B20 respectively. Two filters for filtering. The single terminal of the seventh switch unit 224 is connected to the input terminal of the fourth low noise amplifier 226, and the two second terminals of the seventh switch unit 224 are respectively connected to the two third filter units 2232. In a corresponding connection, a second end of the seventh switch unit 224 is connected to an auxiliary low frequency receiving port AUX_LB (AUX_LB2 in FIG. 10 ) through the second preset low frequency filter 221 , and a second end of the seventh switch unit 224 The terminal is connected to an auxiliary low-frequency receiving port AUX_LB (AUX_LB1 in FIG. 10 ).Wherein, the two third filtering units 2232 connected to the two second terminals of the seventh switch unit 224 Two filters for filtering the two low-frequency signals respectively. It should be noted that, in the embodiment of the present application, the third filtering unit 2232 connected to the sixth switching unit 223 and the seventh switching unit 224 is not performed. Further limitations can be set according to actual requirements, wherein the third filtering units 2232 are respectively used to filter the received low-frequency signals, and the frequency bands of the low-frequency signals output by each third filtering unit 2232 are different.

In one embodiment, the receive path may include: the second low frequency antenna port LB ANT, the second switch circuit 230, the sixth switch unit 223 or the seventh switch unit 224, the third low noise amplifier 225 or the fourth low noise amplifier 226, the eighth switch unit 227, a receiving path formed by any receiving port LNA OUT, and the second low frequency antenna port LB ANT, the second switch circuit 230, the low frequency receiving port LB_RX, the auxiliary low frequency receiving port AUX LB, The preset low frequency filter in the second receiving circuit 220, the sixth switch unit 223 or the seventh switch unit 224, the third low noise amplifier 225 or the fourth low noise amplifier 226, the eighth switch unit 227, any receiving port Another receiving path formed by the LNA OUT, and the auxiliary low-frequency receiving port AUX LB, the preset low-frequency filter in the second receiving circuit 220, the sixth switching unit 223 or the seventh switching unit 224, the third low-noise The amplifier 225 or the fourth low noise amplifier 226, the eighth switch unit 227, and any receiving port LNA OUT form another receiving path together.

In an exemplary example, as shown in FIG. 10 , the second switch circuit 230 includes a ninth switch unit 231 . In one embodiment, the ninth switch unit 231 may be a multi-channel selection switch 231 such as SP8T. Part of the first ends of the ninth switch unit 231 are respectively connected with the plurality of third filtering units 2232 in a one-to-one correspondence. In an embodiment, some of the ports connected with the plurality of third filtering units 2232 in a one-to-one correspondence include four, Corresponding to B8, B6, B12/B13, B20 frequency bands respectively. Part of the first ends of the ninth switch unit 231 are respectively connected to a plurality of low frequency receiving ports LB_RX (such as LB RX2 , LB RX1 , LBTRX2 , and LB TRX_DC in FIG. 10 ) in a one-to-one correspondence.

It should be noted that, in the embodiments of the present application, the switch units in the figures are only some examples, and are not used to limit the number and types of switches included in the switch units. The switch units in the embodiments of the present application can be based on The number of circuits it is connected to is set.

In an illustrative example, the LFEM device is further provided with five receive ports OUT (such as OUT1, OUT2, OUT3, OUT4, and OUT5 in FIG. 10 ), a third antenna port MHB ANT for connecting mid-to-high frequency antennas, and Seven auxiliary mid-to-high frequency receive ports AUX_MHB and two mid-to-high frequency receive ports RX for external frequency band expansion. Among them, the receiving port OUT, the third antenna port MHB ANT, the auxiliary receiving port AUX_MHLB and the two receiving ports RX can be understood as the radio frequency pin terminals of the radio frequency front-end device, which are used for connection with various external devices. As shown in FIG. 10 , the LFEM device further includes: a third receiving circuit 240 and a third switching circuit 250, which are used to support diversity receiving and amplifying processing of multiple intermediate frequency signals and multiple high frequency signals.

In an exemplary example, the LFEM device may further include: a third controller 190, which is respectively connected to each switch unit in the LFEM device, and used to control the on-off of each switch unit.

Based on the development trend of miniaturization of mainboards of terminal equipment, an embodiment of the present application provides an LFEM device, the composition of which is shown in FIG. 10 . The whole chip integrates multiple low, medium and high frequency receiving channels, including B8, B6, B12/B13, B20, B4, B66, B1, B25, B3, B32, B34, B39, B30, B7, B40, B41 and many more. Auxiliary ports are used for the expansion of external frequency bands such as N28 frequency band.

FIG. 11 is a schematic structural diagram of the second embodiment of the LFEM device according to the embodiment of the present application, which is described by taking the implementation of receiving the low frequency signal of the preset low frequency N28 as an example.

The receiving path of the fourth low frequency band signal of the N28 frequency band is as follows:

The second low frequency antenna port LB ANT→contact 5 of the multi-channel selection switch 231→low frequency receiving port LB RX2→auxiliary low frequency receiving port AUX LB_28→N28 filter 222→sixth switch unit 223→third low noise amplifier 225→th Contact 3 of the eight switch unit 227→the eighth switch unit 227 switches to contact 1→any receiving port LMHB OUT→RF transceiver.

The receiving path of the fifth low-band signal of the N28 frequency band is as follows:

The fifth low frequency signal from the combiner 84 → the auxiliary low frequency receiving port AUX LB2 → the N28 filter 221 → the seventh switch unit 224 → the fourth low noise amplifier 226 → the contact 4 of the eighth switch unit 227 → the eighth switch Unit 227 switches to Contact 2→Receive Port LB OUT→RF Transceiver.

In one embodiment shown in FIGS. 10 and 11 , the second preset low-frequency filter 221 is arranged at the front end of the seventh switch unit 224 , and is connected to the seventh switch unit 224 through the contact 4 of the seventh switch unit 224 . The preset low frequency filter 222 is arranged at the front end of the sixth switch unit 223, and is connected to the sixth switch unit 223 through the contact 3 of the sixth switch unit 223, that is, the second preset low frequency filter 221 and the auxiliary low frequency receiving port AUX LB2 The connection and the connection between the third preset low frequency filter 222 and the auxiliary low frequency receiving port AUX LB_28 is only an example, and is not used to limit the setting positions of the second preset low frequency filter 221 and the third preset low frequency filter 222 . In an embodiment, the second preset low frequency filter 221 may be disposed at the front end of the sixth switch unit 223, and the sixth switch unit 223 is connected through the contact 3 of the sixth switch unit 223, and the third preset low frequency filter The filter 222 may be disposed at the front end of the seventh switch unit 224 , and is connected to the seventh switch unit 224 through the contact 4 of the seventh switch unit 224 . In one embodiment, the second preset low frequency filter 221 may be disposed at the front end of the seventh switch unit 224, and the seventh switch unit 224 is connected through the contact 3 of the seventh switch unit 224, and the third preset low frequency filter The filter 222 is disposed at the front end of the sixth switch unit 223 , and is connected to the sixth switch unit 223 and so on through the contact 4 of the sixth switch unit 223 . When the positions of the second preset low-frequency filter 221 and the third preset low-frequency filter 222 are changed, it is only necessary to change the internal circuit of the device.

For example, FIG. 12 is a schematic structural diagram of a third embodiment of an LFEM device in an embodiment of the present application. As shown in FIG. 12 , the second preset low-frequency filter 221 is disposed at the front end of the seventh switch unit 224 , and the seventh switch The contact 4 of the unit 224 is connected to the seventh switch unit 224, the third preset low frequency filter 222 is arranged at the front end of the sixth switch unit 223, and the sixth switch unit 223 is connected through the contact 4 of the sixth switch unit 223. In this case, the implementation of the low frequency signal of the preset low frequency band N28 is still taken as an example for description.

The receiving path of the fourth low frequency band signal of the N28 frequency band is as follows:

Second low frequency antenna port LB ANT→contact 6 of multi-channel selection switch 231→low frequency receiving port LB RX1→auxiliary low frequency receiving port AUX LB_28+20→N28 filter 222→sixth switch unit 223→third low noise amplifier 225 →Contact 3 of the eighth switch unit 227→The eighth switch unit 227 switches to the contact 1→any receiving port LMHBOUT→RF transceiver.

The receiving path of the fifth low-band signal of the N28 frequency band is as follows:

The fifth low frequency signal from the combiner 84 → the auxiliary low frequency receiving port AUX LB2 → the N28 filter 221 → the seventh switch unit 224 → the fourth low noise amplifier 226 → the contact 4 of the eighth switch unit 227 → the eighth switch Unit 227 switches to Contact 2→Receive Port LB OUT→RF Transceiver.

For example, FIG. 13 is a schematic structural diagram of the LFEM device according to the fourth embodiment of the present application. As shown in FIG. 13 , the second preset low-frequency filter 221 is disposed at the front end of the seventh switch unit 224 , and the seventh switch The contact 3 of the unit 224 is connected to the seventh switch unit 224, the third preset low frequency filter 222 is arranged at the front end of the sixth switch unit 223, and is connected to the sixth switch unit 223 through the contact 4 of the sixth switch unit 223. In this case, the implementation of the low frequency signal of the preset low frequency band N28 is still taken as an example for description.

The receiving path of the fourth low frequency band signal of the N28 frequency band is as follows:

Second low frequency antenna port LB ANT→contact 6 of multi-channel selection switch 231→low frequency receiving port LB RX1→auxiliary low frequency receiving port AUX LB_28+20→N28 filter 222→sixth switch unit 223→third low noise amplifier 225 →Contact 3 of the eighth switch unit 227→The eighth switch unit 227 switches to the contact 1→any receiving port LMHBOUT→RF transceiver.

The receiving path of the fifth low-band signal of the N28 frequency band is as follows:

The fifth low frequency signal from the combiner 84 → the auxiliary low frequency receiving port AUX LB1 → the N28 filter 221 → the seventh switch unit 224 → the fourth low noise amplifier 226 → the contact 4 of the eighth switch unit 227 → the eighth switch Unit 227 switches to Contact 2→Receive Port LB OUT→RF Transceiver.

N28 is a low-frequency band of 5G. N28 has low wireless frequency, relatively long wavelength, strong diffraction ability, and greater coverage. It will become an important low-frequency coverage of China's 5G network. In order to increase the download rate of the low-frequency network, it is necessary to obtain a larger throughput (Throughput) by configuring a multiple-input multiple-output (MIMO, Multi-input Multi-output) for the low-frequency network.

The RF front-end device provided by the embodiment of the present application does not require external filter components, reduces the PCB footprint, improves the integration of the RF device, and reduces the cost, and after integration, each part can be implemented inside the RF front-end device The matching between the ports reduces the port mismatch, thereby improving the product performance. In order to meet the requirements of the 5G LB MIMO function, an embodiment of the present application further provides a radio frequency transceiver system, and the radio frequency transceiver system is implemented by the 5G radio frequency LB L-PA Mid device and the LFEM device provided by the embodiment of the present application.

FIG. 14 is a schematic structural diagram of a first embodiment of a radio frequency transceiver system according to an embodiment of the application. As shown in FIG. 14 , in one embodiment, the radio frequency transceiver system at least includes: a first antenna ANT1, a second antenna ANT2, a first antenna The three antennas ANT1, the fourth antenna ANT4, the radio frequency transceiver 40, the external circuit 10, the radio frequency front-end device in any of the foregoing embodiments in FIG. 1 to FIG. Mid device 50) and the radio frequency front-end device in any of the foregoing embodiments in FIG. 8 to FIG. 13 (referred to as a second radio frequency front-end device for distinction, such as the LFEM device 60). in,

The radio frequency transceiver 40 is connected to the first antenna ANT1 via the radio frequency LB L-PA Mid device 50 and the external circuit 10 to form a transmission channel of the low frequency signal including at least the first low frequency signal and a low frequency frequency including at least the second low frequency signal The main set of signal receiving channels;

The radio frequency transceiver 40 is connected to the second antenna ANT2 through the radio frequency LB L-PA Mid device 50 to form a main set of MIMO receiving channels of low frequency signals including at least the second low frequency signal;

The radio frequency transceiver 40 is connected to the third antenna ANT3 via the LFEM60 to form a diversity receiving channel of the low-frequency signal at least including the fourth low-frequency signal;

The radio frequency transceiver 40 is connected to the fourth antenna ANT4 via the LFEM60 to form a diversity MIMO receiving channel of the low-frequency signal at least including the fifth low-frequency signal;

The first low-frequency signal, the second low-frequency signal, the third low-frequency signal, the fourth low-frequency signal, and the fifth low-frequency signal are signals of the same preset low-frequency frequency.

In an exemplary example, the preset low frequency band may include, but is not limited to, one or any combination of the following: N28, N5, N8 and other frequency bands.

In an illustrative example, the external circuit 10 is a preset low-band duplexer. In one embodiment, the preset low-band duplexer is an N28 duplexer.

In one embodiment, the first antenna ANT1 may be used for low frequency signal transmission and main set reception, and the first antenna ANT1 is connected to the first low frequency antenna port LB ANT of the radio frequency LB L-PA Mid device 50 . The second antenna ANT2 can be used for the main MIMO reception of low-frequency signals, and the second antenna ANT2 is connected to an auxiliary receiving port LNA_AUX of the radio frequency LB L-PA Mid device 50 . The third antenna ANT3 may be used to implement diversity reception of low frequency signals, and the third antenna ANT3 is connected to the second low frequency antenna port LB ANT of the LFEM device 60 . The fourth antenna ANT4 can be used to implement diversity MIMO reception, and the fourth antenna ANT4 is connected to an auxiliary low frequency receiving port AUX_LB of the LFEM device 60 .

In the radio frequency transceiver system provided by the embodiments of the present application, on the one hand, since the external filter is built into the radio frequency front-end device, the integration degree is improved, thereby reducing the occupied mainboard area; on the other hand, because the device integration degree is improved, only packaging First, the cost is reduced; secondly, through integration, the matching between various parts can be realized within the device, which reduces port mismatch and improves product performance.

In an exemplary example, as shown in FIG. 15 , the radio frequency transceiver system shown in FIG. 14 may further include: a transceiver module 70 , a first combiner 81 , a second combiner 82 , and a third combiner 83 and the fourth combiner 84 . Among them, the transceiver module 70 is used to support the main set of transceiver processing of multiple mid-band and multiple high-frequency radio frequency signals;

It should be noted that the specific implementation of the transceiver module 70 in the embodiment of the present application is not used to limit the protection scope of the present application.

In an exemplary example, a first end of the first combiner 81 is connected to the first low frequency antenna port LB ANT of the radio frequency LB L-PA Mid device 50 , and the other first end of the first combiner 81 It is connected to an antenna port ANT1 of the transceiver module 70, and the second end of the first combiner 81 is connected to the first antenna ANT1. A first end of the second combiner 82 is connected to an auxiliary receiving port LNA_AUX of the radio frequency LB L-PA Mid device 50 , and the other first end of the second combiner 82 is connected to the MIMO port of the transceiver module 70 . The second end of the two combiner 82 is connected to the second antenna ANT2. A first end of the third combiner 83 is connected to the second low frequency antenna port LB ANT of the LFEM device 60 , and the other first end of the third combiner 83 is connected to the medium and high frequency antenna port MHB ANT of the LFEM device 60 , The second end of the third combiner 83 is connected to the third antenna ANT3. A first end of the fourth combiner 84 is connected to an auxiliary low frequency receiving port AUX_LB of the LFEM device 60 , and the other first end of the fourth combiner 84 is connected to an auxiliary medium and high frequency receiving port AUX_MHB of the LFEM device 60 , The second end of the fourth combiner 84 is connected to the fourth antenna ANT4.

In an exemplary example, an embodiment of the present application further provides a radio frequency transceiver system. As shown in FIGS. 15-18 , the radio frequency transceiver system may include an antenna group, a radio frequency LB L-PA Mid device 50 , a transceiver module 70 , a radio frequency transceiver 20 , an LFEM device 60 , multiple switch modules and multiple combiners.

The antenna group includes a first antenna ANT1, a second antenna ANT2, a third antenna ANT3 and a fourth antenna ANT4. The first antenna ANT1, the second antenna ANT2, the third antenna ANT3, and the fourth antenna ANT4 are all antennas capable of supporting the 4G frequency band and the 5G NR frequency band. In one embodiment, the first antenna ANT1, the second antenna ANT2, the third antenna ANT3 and the fourth antenna ANT4 may be directional antennas or non-directional antennas. Exemplarily, the first antenna ANT1, the second antenna ANT2, the third antenna ANT3 and the fourth antenna ANT4 may be formed using any suitable type of antenna. For example, the first antenna ANT1, the second antenna ANT2, the third antenna ANT3 and the fourth antenna ANT4 may include antennas with resonant elements formed by the following antenna structures: array antenna structure, loop antenna structure, patch antenna structure, slot antenna At least one of a structure, a helical antenna structure, a strip antenna, a monopole antenna, a dipole antenna, and the like. Different types of antennas can be used for different frequency band combinations of RF signals.

The radio frequency LB L-PA Mid device 50 is used for supporting the sending and receiving processing of multiple low frequency radio frequency signals, and filtering and processing the received signals of the external preset low frequency frequency band. The radio frequency LB L-PA Mid device 50 may be the radio frequency LB L-PA Mid device in any of the foregoing embodiments in FIG. 1 to FIG. 7 . Exemplarily, the frequency bands of the multiple low frequency signals may at least include B8, B12, B20, B26 frequency bands and a preset low frequency band, and the preset low frequency band may include but not limited to one or any combination of the following: N28, N5, N8, etc. frequency band. In one embodiment, the first low-frequency signal, the second low-frequency signal, and the third low-frequency signal may be signals in the N28 or N5 or N8 frequency bands.

The transceiver module 70, which may be a radio frequency L-PA Mid device, is used to support the transmission and reception of medium and high frequency radio frequency signals. The mid- and high-frequency radio frequency signals may specifically include mid-frequency radio frequency signals and high-frequency radio frequency signals.

The LFEM device 60 is configured with a low-frequency antenna port, a medium-high frequency antenna port, and a medium-high frequency transceiver port, which is used to support the diversity receiving and amplifying processing of multiple radio frequency signals in the low-frequency, medium-frequency and high-frequency bands, and the external preset low frequency The received signal of the frequency band is filtered. The LFEM device 60 may be the LFEM device in any of the foregoing embodiments in FIGS. 8 to 13 . In an embodiment, the plurality of radio frequency signals of the low frequency band, the middle frequency band and the high frequency band may at least include B8, B6, B12, B20, B4, B66, B1, B25, B3, B32, B34, B39, B30, B7 , B40, B41 and multiple auxiliary ports are used for the expansion of external frequency bands, that is, preset low frequency bands such as N28 frequency bands.

FIG. 16 is a schematic structural diagram of the third embodiment of the radio frequency transceiver system according to the embodiment of the application. Based on the radio frequency transceiver system shown in FIG. 16 and in combination with FIG. 4 , FIG. 5 , FIG. 10 , and FIG. 11 , the preset low frequency band is N28 Band Analysis The working principle of the N28 band is as follows.

TX link: the transmit signal (ie the first low frequency signal) is output from the TXO LB1 port of the radio frequency transceiver 40, and goes through the radio frequency line to the first low frequency transmit port 4G LB RFIN of the radio frequency LB L-PA Mid device 50; After a power amplifier 111 amplifies the signal, it goes to the single port of the first switch unit 112 (SP8T switch); the first switch unit 112 switches to the contact 4, to the auxiliary transmit port LB TXOUT4; through the N28 duplexer 10, to the auxiliary transceiver Port LB_TRX4; the multi-channel selection switch 131 (SP9T switch) switches the single port to the first low frequency antenna port LB ANT; via Path02, to combiner 81; via Path01, to transmit from the first antenna ANT1.

PRX link: the received signal (ie the second low frequency signal) enters from the first antenna ANT1, goes through the Path01 path, to the combiner 81; passes through the Path02 path, to the first low frequency antenna port of the RF LB L-PA Mid device 50 LB ANT; the multi-channel selection switch 131 (SP9T switch) switches to contact 4, through the N28 duplexer 10, to the auxiliary receiving port LNA_AUX1; the second switch unit 122 (SP4T#1 switch) switches the single port to the first low noise Amplifier 124 (LNA1) channel; after being amplified by the first low noise amplifier 124 (LNA1), it goes to the fourth switch unit 126 (DPDT switch); the fourth switch unit 126 (DPDT switch) switches to the contact 1, to the receiving port LNA OUT1 output; the received signal enters the radio frequency transceiver 40 through the SDR PRXE port.

DRX link: The received signal (ie, the fourth low frequency signal) enters from the third antenna ANT3, goes through Path05, to the combiner 83; passes through Path06, to the second low frequency antenna port LB ANT of the LFEM device 60; multi-channel selection switch 231 (SP8T switch) is switched to contact 5, to the low frequency receiving port LB RX2, through the RF line to the auxiliary low frequency receiving port AUX LB_28; through the N28 filter 222, to the sixth switch unit 223 (SP4T#4 switch); sixth The switch unit 223 (SP4T#4 switch) switches the single port, and after being amplified by the third low noise amplifier 225 (LNA6), it goes to the eighth switch unit 227 (DPDT switch); the eighth switch unit 227 (DPDT switch) switches to the contact 1. Output to the receiving port LMHB OUT port; the received signal enters the radio frequency transceiver 40 through the SDR DRXE port.

PRX MIMO link: the received signal (ie, the third low frequency band signal) enters from the second antenna ANT2, goes through Path03, goes to the combiner 82; goes through Path04, goes to the auxiliary receive port LNA_AUX3 of the RF LB L-PA Mid device 50, goes through Path04 After being filtered by the N28 filter 121, it goes to the second RF switch 123 (SP4T#2 switch); the second RF switch 123 (SP4T#2 switch) switches the single port, and after being amplified by the second low noise amplifier 125 (LNA2), it goes to the second RF switch 123 (SP4T#2 switch). Four switch units 126 (DPDT switch); the fourth switch unit 126 (DPDT switch) switches to contact 2 and outputs to the receiving port LNA OUT2; the received signal enters the radio frequency transceiver 40 through the SDR PRX10 port;

DRX MIMO link: the received signal (ie, the fifth low frequency band signal) enters from the fourth antenna ANT4, goes through the Path07 path, to the combiner 84; goes through the Path08 path, to the auxiliary low frequency receiving port AUX LB2 of the LFEM device 60, N28 is filtered After filtering by the filter 221, it goes to the seventh switch unit 224 (SP4T#5 switch); the seventh switch unit 224 (SP4T#5 switch) switches the single port, and after being amplified by the fourth low noise amplifier 226 (LNA7), it goes to the eighth switch Unit 227 (DPDT switch); the eighth switch unit 227 (DPDT switch) switches to contact 2, to the receiving port LB OUT; the received signal enters the RF transceiver 40 through the SDR DRX10 port.

FIG. 17 is a schematic structural diagram of the fourth embodiment of the radio frequency transceiver system according to the embodiment of the application. Based on the radio frequency transceiver system shown in FIG. 17 and in conjunction with FIG. 6 , FIG. 10 , and FIG. The working principle of the N28 frequency band is as follows.

TX link: the transmit signal (ie the first low frequency signal) is output from the TXO LB1 port of the radio frequency transceiver 40, and goes through the radio frequency line to the first low frequency transmit port 4G LB RFIN of the radio frequency LB L-PA Mid device 50; After a power amplifier 111 amplifies the signal, it goes to the single port of the first switch unit 112 (SP8T switch); the first switch unit 112 switches to the contact 4, to the auxiliary transmit port LB TXOUT4; through the N28 duplexer 10, to the auxiliary transceiver Port LB_TRX4; the multi-channel selection switch 131 (SP9T switch) switches the single port to the first low frequency antenna port LB ANT; via Path02, to combiner 81; via Path01, to transmit from the first antenna ANT1.

PRX link: the received signal (ie the second low frequency signal) enters from the first antenna ANT1, goes through the Path01 path, to the combiner 81; passes through the Path02 path, to the first low frequency antenna port of the RF LB L-PA Mid device 50 LB ANT; the multi-channel selection switch 131 (SP9T switch) switches to contact 4, through the N28 duplexer 10, to the auxiliary receiving port LNA_AUX3; the third switch unit 123 (SP4T#2 switch) switches the single port to the first low noise Amplifier 124 (LNA1) channel; after being amplified by the first low noise amplifier 124 (LNA1), it goes to the fourth switch unit 126 (DPDT switch); the fourth switch unit 126 (DPDT switch) switches to the contact 2 and goes to the receiving port LNA OUT2 output; the received signal enters the radio frequency transceiver 40 through the SDR PRX10 port.

DRX link: The received signal (ie, the fourth low frequency signal) enters from the third antenna ANT3, goes through Path05, to the combiner 83; passes through Path06, to the second low frequency antenna port LB ANT of the LFEM device 60; multi-channel selection switch 231 (SP8T switch) is switched to contact 5, to the low frequency receiving port LB RX2, through the RF line to the auxiliary low frequency receiving port AUX LB_28; through the N28 filter 222, to the sixth switch unit 223 (SP4T#4 switch); sixth The switch unit 223 (SP4T#4 switch) switches the single port, and after being amplified by the third low noise amplifier 225 (LNA6), it goes to the eighth switch unit 227 (DPDT switch); the eighth switch unit 227 (DPDT switch) switches to the contact 1. Output to the receiving port LMHB OUT port; the received signal enters the radio frequency transceiver 40 through the SDR DRXE port.

PRX MIMO link: the received signal (ie, the third low frequency band signal) enters from the second antenna ANT2, goes through Path03, goes to the combiner 82; goes through Path04, goes to the auxiliary receive port LNA_AUX1 of the radio frequency LB L-PA Mid device 50, goes through Path04 After being filtered by the N28 filter 121, it goes to the first RF switch 122 (SP4T#1 switch); the first RF switch 122 (SP4T#1 switch) switches the single port, and after being amplified by the first low noise amplifier 124 (LNA1), it goes to the first RF switch 122 (SP4T#1 switch). Four switch units 126 (DPDT switch); the fourth switch unit 126 (DPDT switch) switches to contact 1 and outputs to the receiving port LNA OUT1; the received signal enters the radio frequency transceiver 40 through the SDR PRXE port;

DRX MIMO link: the received signal (ie, the fifth low frequency band signal) enters from the fourth antenna ANT4, goes through the Path07 path, to the combiner 84; goes through the Path08 path, to the auxiliary low frequency receiving port AUX LB2 of the LFEM device 60, N28 is filtered After filtering by the filter 221, it goes to the seventh switch unit 224 (SP4T#5 switch); the seventh switch unit 224 (SP4T#5 switch) switches the single port, and after being amplified by the fourth low noise amplifier 226 (LNA7), it goes to the eighth switch Unit 227 (DPDT switch); the eighth switch unit 227 (DPDT switch) switches to contact 2, to the receiving port LB OUT; the received signal enters the RF transceiver 40 through the SDR DRX10 port.

FIG. 18 is a schematic structural diagram of a fifth embodiment of the radio frequency transceiver system in the embodiment of the application. Based on the radio frequency transceiver system shown in FIG. 18 and in conjunction with FIG. 7 and FIG. 13 , the working principle of the N28 frequency band is analyzed by taking the preset low frequency band as N28 as follows.

TX link: the transmit signal (ie the first low frequency signal) is output from the TXO LB1 port of the radio frequency transceiver 40, and goes through the radio frequency line to the first low frequency transmit port 4G LB RFIN of the radio frequency LB L-PA Mid device 50; After a power amplifier 111 amplifies the signal, it goes to the single port of the first switch unit 112 (SP8T switch); the first switch unit 112 switches to the contact 4, to the auxiliary transmit port LB TXOUT4; through the N28 duplexer 10, to the auxiliary transceiver Port LB_TRX4; the multi-channel selection switch 131 (SP9T switch) switches the single port to the first low frequency antenna port LB ANT; via Path02, to combiner 81; via Path01, to transmit from the first antenna ANT1.

PRX link: the received signal (ie the second low frequency signal) enters from the first antenna ANT1, goes through the Path01 path, to the combiner 81; passes through the Path02 path, to the first low frequency antenna port of the RF LB L-PA Mid device 50 LB ANT; the multi-channel selection switch 131 (SP9T switch) switches to contact 4, through the N28 duplexer 10, to the auxiliary receiving port LNA_AUX4; the third switch unit 123 (SP4T#2 switch) switches the single port to the second low noise Amplifier 125 (LNA2) channel; after being amplified by the second low noise amplifier 125 (LNA2), it goes to the fourth switch unit 126 (DPDT switch); the fourth switch unit 126 (DPDT switch) switches to the contact 4 and goes to the receiving port LNA OUT2 output; the received signal enters the radio frequency transceiver 40 through the SDR PRX10 port.

DRX link: The received signal (ie, the fourth low frequency signal) enters from the third antenna ANT3, goes through Path05, to the combiner 83; passes through Path06, to the second low frequency antenna port LB ANT of the LFEM device 60; multi-channel selection switch 231 (SP8T switch) is switched to contact 6, to the low frequency receiving port LB RX1, via the radio frequency line to the auxiliary low frequency receiving port AUX LB_28+20; via the N28 filter 222, to the sixth switch unit 223 (SP4T#4 switch); The sixth switch unit 223 (SP4T#4 switch) switches the single port, and after being amplified by the third low noise amplifier 225 (LNA6), it goes to the eighth switch unit 227 (DPDT switch); the eighth switch unit 227 (DPDT switch) switches to Contact 1 is output to the receiving port LMHB OUT port; the received signal enters the radio frequency transceiver 40 through the SDR DRXE port.

PRX MIMO link: the received signal (ie, the third low frequency band signal) enters from the second antenna ANT2, goes through Path03, goes to the combiner 82; goes through Path04, goes to the auxiliary receive port LNA_AUX2 of the RF LB L-PA Mid device 50, goes through Path04 After being filtered by the N28 filter 121, it goes to the first RF switch 122 (SP4T#1 switch); the first RF switch 122 (SP4T#1 switch) switches the single port, and after being amplified by the first low noise amplifier 124 (LNA1), it goes to the first RF switch 122 (SP4T#1 switch). Four switch units 126 (DPDT switch); the fourth switch unit 126 (DPDT switch) switches to contact 1 and outputs to the receiving port LNA OUT1; the received signal enters the radio frequency transceiver 40 through the SDR PRXE port;

DRX MIMO link: the received signal (ie, the fifth low frequency band signal) enters from the fourth antenna ANT4, goes through the Path07 path, to the combiner 84; passes through the Path08 path, to the auxiliary low frequency receiving port AUX LB1 of the LFEM device 60, N28 is filtered After filtering by the filter 221, it goes to the seventh switch unit 224 (SP4T#5 switch); the seventh switch unit 224 (SP4T#5 switch) switches the single port, and after being amplified by the fourth low noise amplifier 226 (LNA7), it goes to the eighth switch Unit 227 (DPDT switch); the eighth switch unit 227 (DPDT switch) switches to contact 2, to the receiving port LB OUT; the received signal enters the RF transceiver 40 through the SDR DRX10 port.

The radio frequency transceiver system in the example of this application supports four-antenna reception (4Rx) modes with preset low frequency bands such as N28, N5, and N8, can receive signals from more paths, supports high-order MIMO, and improves network efficiency and user perception rate; and , in the embodiment of the present application, by integrating the external preset low-frequency filter into the radio frequency front-end device, the integration degree is improved and the occupied mainboard area is reduced; It also reduces the cost; moreover, through integration, the matching between the various parts can be realized within the device, which reduces the port mismatch and improves the performance of the radio frequency transceiver system. The radio frequency transceiver system in the example of this application also realizes the transceiver control of B8, B12, B20, B26 frequency bands, preset low frequency bands, and 2G LB and 2G HB GSM signals, which expands the communication frequency band of the radio frequency transceiver system and improves the Communication performance of radio frequency transceiver systems. The radio frequency transceiver system in the example of this application also supports the 4Rx mode for medium and high frequency bands.

An embodiment of the present application further provides a communication device, the communication device is provided with the radio frequency transceiver system in any of the above embodiments, and by setting the radio frequency transceiver system in the communication device, the integration of an external filter with a preset low frequency band is realized. In the RF front-end device, the integration level is improved and the occupied mainboard area is reduced; moreover, due to the improvement of the device integration level, it only needs to be packaged once, which also reduces the cost; moreover, through integration, it can be realized inside the device. The matching between the parts reduces the port mismatch and improves the performance of the communication device.

Although the embodiments disclosed in the present application are as above, the described contents are only the embodiments adopted to facilitate the understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which this application belongs, without departing from the spirit and scope disclosed in this application, can make any modifications and changes in the form and details of the implementation, but the scope of patent protection of this application must still be The scope defined by the appended claims shall prevail.

Claims (23)

1. A radio frequency front-end device is characterized by being provided with a first low-frequency transmitting port, at least two receiving ports, a first low-frequency antenna port, at least one auxiliary transmitting port, at least one auxiliary receiving and transmitting port and at least two auxiliary receiving ports, wherein the at least one auxiliary transmitting port, the at least two auxiliary receiving ports and the at least two auxiliary receiving ports are used for external low-frequency band expansion; the auxiliary transmitting port and the auxiliary receiving and transmitting port are connected in a one-to-one correspondence mode through an external circuit; the radio frequency front end device comprises:

the first transmitting circuit is connected with the first low-frequency transmitting port and the at least one auxiliary transmitting port and is used for amplifying a first low-frequency band signal in the plurality of low-frequency band signals from the first low-frequency transmitting port and outputting the first low-frequency band signal through the auxiliary transmitting port;

the first receiving circuit is internally provided with at least one preset low-frequency filter, is connected with the receiving port and the at least two auxiliary receiving ports, and is used for amplifying a second low-frequency band signal from the auxiliary receiving port connected with an external circuit and outputting the second low-frequency band signal to the receiving port, and filtering and amplifying a third low-frequency band signal from the auxiliary receiving port through the internally arranged preset low-frequency band filter and outputting the third low-frequency band signal to the receiving port;

the first ends of the switch circuit are respectively connected with the first transmitting circuit, the first receiving circuit and the at least one auxiliary receiving and transmitting port, and the second end of the switch circuit is connected with the first low-frequency antenna port and used for selectively conducting a radio frequency channel between the first transmitting circuit, the receiving circuit and the at least one auxiliary receiving and transmitting port and the first low-frequency antenna port;

the first low-frequency band signal, the second low-frequency band signal and the third low-frequency band signal are signals of the same preset low-frequency band.

2. The radio frequency front end device of claim 1, wherein the radio frequency front end device is a radio frequency LB L-PA Mid device.

3. The radio frequency front end device of claim 2, wherein the first transmit circuit comprises: a first power amplifier, a first switching unit; wherein,

the input end of the first power amplifier is connected with the first low-frequency transmitting port, and the output end of the first power amplifier is connected with a first end of the first switching unit and used for performing power amplification processing on the first low-frequency band signal received by the first low-frequency transmitting port;

and part of second ends of the first switch units are correspondingly connected with at least one auxiliary transmitting port and used for outputting a first low-frequency-band signal in the amplified low-frequency-band signals to the external circuit.

4. The radio frequency front end device of claim 3, the first transmit circuit further comprising: a plurality of first filtering units;

and the second ends of the other part of the first switch unit are respectively connected with the first switch circuit through a first filtering unit, and are used for filtering the low-frequency band signals except the first low-frequency band signal in the plurality of low-frequency band signals amplified by the first power amplifier and outputting the low-frequency band signals to the first switch circuit.

5. The radio frequency front end device of claim 2, wherein the first receive circuit comprises: the low-noise amplifier comprises a first low-noise amplifier, a second switch unit, a third switch unit, a fourth switch unit and a first preset low-frequency band filter; wherein,

a second end of the second switch unit or the third switch unit is connected with the auxiliary receiving port through a first preset low-frequency filter, and is used for filtering the third low-frequency signal and outputting the third low-frequency signal to the first low-noise amplifier or the second low-noise amplifier; the other second end of the second switch unit or the third switch unit is connected with the other auxiliary receiving port and is used for outputting the second low-frequency band signal to the first low-noise amplifier or the second low-noise amplifier;

the single terminals of the second switching unit and the third switching unit are respectively connected with the input ends of the first low-noise amplifier and the second low-noise amplifier; and the first low-noise amplifier or the second low-noise amplifier respectively amplifies the received low-frequency band signals and outputs the amplified low-frequency band signals to the receiving port through the fourth switching unit.

6. The radio frequency front end device of claim 5, the first receive circuit further comprising a plurality of second filtering units;

the input end of each second filtering unit is correspondingly connected with the first switch circuit; the output end of each second filtering unit is correspondingly connected with a second end of the second switch unit or the third switch unit, and is used for filtering the received low-frequency band signals, and the frequency bands of the low-frequency band signals output by each second filtering unit are different.

7. The radio frequency front end device of claim 1, wherein the external circuit is a preset low band duplexer;

the auxiliary transmitting port is connected with one output port of a preset low-frequency band duplexer and used for outputting the first low-frequency band signal;

the auxiliary receiving and transmitting port is connected with a public port of a preset low-frequency band duplexer and used for outputting the received second low-frequency band signal to the preset low-frequency band duplexer;

and the auxiliary receiving port is connected with the other output port of the preset low-frequency band duplexer and used for outputting the second low-frequency band signal to the first receiving circuit.

8. The radio frequency front end device according to claim 7, wherein the preset low frequency band comprises one or any combination of the following: n28, N5, N8 frequency bands;

the preset low-band duplexer comprises one or any combination of the following components: an N28 duplexer, an N5 duplexer, and an N8 duplexer.

9. The radio frequency front end device of claim 1, further provided with a coupled output port;

the radio frequency front-end device further comprises a coupling circuit, which is arranged in a radio frequency path between the first switch circuit and the first low-frequency antenna port and is used for coupling a low-frequency band signal in the radio frequency path so as to output a coupled signal through a coupling output port.

10. The rf front-end device of claim 1, further provided with a second low frequency transmit port, a high frequency transmit port, and a high frequency output port;

the radio frequency front-end device also comprises a second transmitting circuit and a third transmitting circuit; wherein,

the input end of the second transmitting circuit is connected with the second low-frequency transmitting port, and the output end of the second transmitting circuit is connected with a first end of the first switch circuit and used for amplifying the received 2G low-frequency signal;

the input end of the third transmitting circuit is connected with the high-frequency transmitting port, and the output end of the third transmitting circuit is connected with the high-frequency output port and used for amplifying the received 2G high-frequency signals.

11. The radio frequency front end device according to any one of claims 1 to 10, wherein the frequency bands of the plurality of low frequency band signals other than the preset low frequency band include B8, B12, B20, B26 frequency bands.

12. A radio frequency front-end device is characterized by being provided with at least two receiving ports, a second low-frequency antenna port for connecting a low-frequency antenna, at least two auxiliary low-frequency receiving ports for external frequency band expansion and at least one low-frequency receiving port; the radio frequency front end device comprises:

the second receiving circuit is internally provided with at least two preset low-frequency band filters, is connected with the receiving port and the at least two auxiliary low-frequency receiving ports, and is used for filtering, amplifying and outputting a fifth low-frequency band signal from the auxiliary low-frequency receiving port to the receiving port through the built-in preset low-frequency band filter, and filtering, amplifying and outputting a fourth low-frequency band signal from the low-frequency receiving port through the radio frequency line to the receiving port through the built-in other preset low-frequency band filter;

the first ends of the second switch circuit are respectively connected with the second receiving circuit and the at least one low-frequency receiving port, and the second end of the second switch circuit is connected with the second low-frequency antenna port and used for selectively conducting the radio-frequency paths between the second receiving circuit and the at least two low-frequency receiving ports and the first low-frequency antenna port;

and the fourth low-frequency band signal and the fifth low-frequency band signal are signals of the same preset low-frequency band.

13. The rf front-end device of claim 12, wherein the rf front-end device is a low frequency front-end module, LFEM, device.

14. The radio frequency front end device of claim 13, wherein the second receive circuit comprises: the first low-noise amplifier, the second low-noise amplifier, the sixth switching unit, the seventh switching unit, the eighth switching unit, the second preset low-frequency filter and the third preset low-frequency filter are connected in series; wherein,

a second end of the sixth switching unit or the seventh switching unit is connected with the auxiliary low-frequency receiving port through a second preset low-frequency filter, and is used for filtering the fifth low-frequency signal and outputting the fifth low-frequency signal to the third low-noise amplifier or the fourth low-noise amplifier; the other second end of the sixth switching unit or the seventh switching unit is connected with the other auxiliary low-frequency receiving port through a third preset low-frequency filter, and is used for filtering the fourth low-frequency signal and outputting the fourth low-frequency signal to a third low-noise amplifier or a fourth low-noise amplifier;

the single terminals of the sixth switching unit and the seventh switching unit are respectively connected with the input ends of the third low noise amplifier and the fourth low noise amplifier; and the third low-noise amplifier or the fourth low-noise amplifier respectively amplifies the received low-frequency band signals and outputs the amplified low-frequency band signals to the receiving port through the eighth switching unit.

15. The radio frequency front end device of claim 14, the second receive circuit further comprising: a plurality of third filtering units;

the input end of each third filtering unit is correspondingly connected with the second switch circuit; the output end of each third filtering unit is correspondingly connected with a second end of the sixth switching unit or the seventh switching unit, and is used for filtering the received low-frequency band signals, and the frequency bands of the low-frequency band signals output by each second filtering unit are different.

16. The radio frequency front end device of claim 15, wherein the frequency bands of the plurality of low frequency band signals filtered by the plurality of third filtering units include B8, B12, B20, and B26 frequency bands.

17. The radio frequency front end device according to any one of claims 12 to 16, further provided with: a third antenna port for connecting a medium-high frequency antenna, a plurality of auxiliary medium-high frequency receiving ports for external frequency band extension and two medium-high frequency receiving ports;

the radio frequency front end device further comprises: and a third receiving circuit and a third switching circuit for supporting diversity reception processing of the plurality of intermediate frequency signals and the plurality of high frequency signals.

18. The rf front-end device of claim 17, wherein the plurality of intermediate frequency signals, the plurality of bands of high frequency signals, comprise: b4, B66, B1, B25, B3, B32, B34, B39, B30, B7, B40, B41.

19. A radio frequency transceiver system, comprising: a first antenna, a second antenna, a third antenna, a fourth antenna, a radio frequency transceiver, external circuitry, a first radio frequency front end device as claimed in any of claims 1 to 11 and a second radio frequency front end device as claimed in any of claims 12 to 18; wherein,

the radio frequency transceiver is connected with the first antenna through a first radio frequency front-end device and an external circuit to form a transmitting channel of low-frequency band signals at least comprising first low-frequency band signals and a main set receiving channel of low-frequency band signals at least comprising second low-frequency band signals;

the radio frequency transceiver is connected with a second antenna through a first radio frequency front-end device to form a main set multiple-input multiple-output (MIMO) receiving channel at least comprising low-frequency band signals of second low-frequency band signals;

the radio frequency transceiver is connected with a third antenna through a second radio frequency front-end device to form a diversity receiving channel of low-frequency band signals at least comprising a fourth low-frequency band signal;

the radio frequency transceiver is connected with a fourth antenna through a second radio frequency front-end device to form a diversity MIMO receiving channel of low-frequency band signals at least comprising a fifth low-frequency band signal;

the first low-frequency band signal, the second low-frequency band signal, the third low-frequency band signal, the fourth low-frequency band signal and the fifth low-frequency band signal are signals of the same preset low-frequency band.

20. The radio frequency transceiver system of claim 19, wherein the first antenna is connected to a first low frequency antenna port of the first radio frequency front end device; the second antenna is connected with an auxiliary receiving port of the first radio frequency front-end device; the third antenna is connected with a second low-frequency antenna port of the second radio-frequency front-end device; the fourth antenna is connected with an auxiliary low-frequency receiving port of the second radio-frequency front-end device.

21. The radio frequency transceiving system of claim 19, further comprising: the first combiner comprises a receiving and transmitting module, a first combiner, a second combiner, a third combiner and a fourth combiner; wherein,

the receiving and transmitting module is used for supporting the main set receiving and transmitting processing of the radio frequency signals of a plurality of middle frequency bands and a plurality of high frequency bands; the second radio frequency front-end device is also used for supporting diversity reception processing of radio frequency signals of a plurality of middle frequency bands and a plurality of high frequency bands;

a first end of the first combiner is connected with a first low-frequency antenna port of the first radio-frequency front-end device, the other first end of the first combiner is connected with an antenna port of the transceiver module, and a second end of the first combiner is connected with the first antenna; one first end of the second combiner is connected with one auxiliary receiving port of the first radio frequency front-end device, the other first end of the second combiner is connected with the MIMO port of the transceiver module, and the second end of the second combiner is connected with the second antenna; one first end of the third combiner is connected with the second low-frequency antenna port of the second radio-frequency front-end device, the other first end of the third combiner is connected with the medium-high frequency antenna port of the second radio-frequency front-end device, and the second end of the third combiner is connected with the third antenna; a first end of the fourth combiner is connected with an auxiliary low-frequency receiving port of the second radio-frequency front-end device, another first end of the fourth combiner is connected with an auxiliary medium-high-frequency receiving port of the second radio-frequency front-end device, and a second end of the fourth combiner is connected with the fourth antenna.

22. The radio frequency transceiver system of any one of claims 19 to 21, wherein the frequency bands of the low frequency band signals include B8, B12, B20, B26 frequency bands; the preset low frequency band comprises one or any combination of the following components: n28, N5 and N8 frequency bands.

23. A communication device comprising a radio frequency transceiver system as claimed in any one of claims 19 to 22.

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