CN114285423A

CN114285423A - Radio frequency L-PA Mid device, radio frequency transceiving system and communication equipment

Info

Publication number: CN114285423A
Application number: CN202011034167.1A
Authority: CN
Inventors: 冯斌
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2022-04-05
Anticipated expiration: 2040-09-27
Also published as: CN114285423B

Abstract

The application provides a radio frequency L-PA Mid device, radio frequency receiving and dispatching system and communication equipment, wherein, radio frequency L-PA Mid device is configured with at least one transmission port, a plurality of receiving ports, at least one antenna port, and radio frequency L-PA Mid device includes: the transmitting module is used for receiving the low-frequency signals and amplifying and filtering the received low-frequency signals; the first ends of the first switch units are respectively correspondingly connected with the transmitting module, and the second ends of the first switch units are connected with an antenna port; the receiving module is respectively connected with the plurality of first ends and the receiving ports of the first switch unit and comprises at least one low-noise amplifier, and the low-frequency signals after filtering processing are amplified by the low-noise amplifiers and then output at least one low-frequency signal; the first control unit is used for adjusting the gain coefficient of the low-noise amplifier so as to reduce the cascade noise coefficient of at least one low-frequency signal receiving channel and further improve the sensitivity of the radio frequency transceiving system.

Description

Radio frequency L-PA Mid device, radio frequency transceiving system and communication equipment

Technical Field

The present application relates to the field of radio frequency technologies, and in particular, to a radio frequency L-PA Mid device, a radio frequency transceiving system, and a communication device.

Background

With the development and progress of technology, in order to meet the increasing demands of various network systems and simultaneously solve the problem of the tense layout of the PCB, the high integration and miniaturization of devices are in a clear trend. From the Phase2 product which only supports single frequency band initially to the Phase7 product which supports integration of each system, the integration level of the device is higher and higher, and the packaging size of the device is smaller and smaller. A 2G, 3G or 4G architecture design defines a low-frequency power amplifier module with a built-in low-noise amplifier, but when the module is applied to a radio frequency transceiving system to receive a low-frequency signal, the sensitivity of a receiving path in the radio frequency transceiving system is low.

Disclosure of Invention

The embodiment of the application provides a radio frequency L-PA Mid device, a radio frequency transceiving system and communication equipment, and can improve the sensitivity of the radio frequency L-PA Mid device.

A radio frequency L-PA Mid device configured with at least one transmit port and a plurality of receive ports for connection to a radio frequency transceiver and at least one antenna port for connection to an antenna, the radio frequency L-PA Mid device comprising:

the transmitting module is connected with the transmitting port and used for receiving the low-frequency signals and amplifying and filtering the received low-frequency signals;

a plurality of first ends of the first switch unit are respectively and correspondingly connected with the transmitting module, and a second end of the first switch unit is connected with one antenna port;

a receiving module, connected to each first end of the first switch unit and each receiving port, respectively, and configured to receive a plurality of low-frequency signals and amplify and filter the received low-frequency signals, where the receiving module includes at least one low-noise amplifier, and the filtered low-frequency signals are amplified by each low-noise amplifier and then output at least one low-frequency signal;

and the first control unit is connected with at least one low-noise amplifier and used for adjusting the gain coefficient of the low-noise amplifier so as to reduce the cascade noise coefficient of at least one low-frequency signal receiving channel.

A radio frequency transceiving system comprising:

as in the radio frequency L-PA Mid devices described above,

the first antenna is connected with the antenna port and used for receiving and transmitting the low-frequency signal;

and the radio frequency transceiver is respectively connected with the transmitting port and the receiving port of the radio frequency L-PA Mid device, is used for transmitting the low-frequency signal to the radio frequency L-PA Mid device, and is also used for receiving the low-frequency signal amplified by the radio frequency L-PA Mid device so as to realize the transceiving control of the low-frequency signal.

A communication device comprises the radio frequency transceiving system.

The radio frequency L-PA Mid device, the radio frequency transceiving system and the communication equipment integrate the receiving module, the transmitting module and the first switch unit, can realize transceiving control on a plurality of low-frequency signals, can avoid externally arranging a corresponding switching circuit on the traditional radio frequency L-PA Mid device to realize receiving of the low-frequency signals, improve the integration level of the radio frequency L-PA Mid device, simultaneously can reduce link loss on a receiving path by omitting the externally arranged switching circuit and reduce the cascade noise coefficient of at least one low-frequency signal receiving path by adjusting the gain coefficient of a low-noise amplifier in the receiving module, and further can improve the sensitivity of the radio frequency L-PA Mid device.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative work.

FIG. 1 is one of the block diagrams of the structure of an RF L-PA Mid device in one embodiment;

FIG. 2a is a second block diagram of the RF L-PA Mid device in one embodiment;

FIG. 2b is a third block diagram of the RF L-PA Mid device in one embodiment;

FIG. 3 is a block diagram of the structure of an RF L-PA Mid device in one embodiment;

FIG. 4 is a block diagram of the structure of an RF L-PA Mid device in one embodiment;

FIG. 5 is a sixth block diagram illustrating the structure of an exemplary RF L-PA Mid device;

FIG. 6 is a seventh block diagram illustrating the structure of an exemplary RF L-PA Mid device;

FIG. 7 is an eighth block diagram illustrating the architecture of an exemplary RF L-PA Mid device;

FIG. 8 is a ninth block diagram illustrating the architecture of an exemplary RF L-PA Mid device;

FIG. 9 is a block diagram showing the structure of an exemplary RF L-PA Mid device;

fig. 10a is a pin diagram of the rf L-PA Mid device of fig. 8;

fig. 10b is a schematic view of a package structure of the rf L-PA Mid device in fig. 8;

fig. 11a is a pin diagram of the rf L-PA Mid device of fig. 9;

fig. 11b is a schematic view of a package structure of the rf L-PA Mid device in fig. 9;

FIG. 12 is a block diagram of an exemplary RF transceiver system;

FIG. 13 is a second block diagram of the RF transceiver system according to an embodiment;

FIG. 14 is a third block diagram of an exemplary functional RF transceiver system;

fig. 15 is a block diagram of an embodiment of an rf transceiver system.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application, and in the accompanying drawings, preferred embodiments of the present application are set forth. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present application, "a number" means at least one, such as one, two, etc., unless specifically limited otherwise.

The radio frequency L-PA Mid device according to the embodiment of the present application may be applied to a communication device having a wireless communication function, where the communication device may be a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, and various forms of User Equipment (UE) (e.g., a Mobile phone), a Mobile Station (MS), and the like. For convenience of description, the above-mentioned devices are collectively referred to as a communication device. The network devices may include base stations, access points, and the like.

As shown in fig. 1, the embodiment of the present application provides a radio frequency L-PA Mid device. The rf L-PA Mid device can be understood as a Power Amplifier module (Power Amplifier Modules including LNAs) With a built-in low noise Amplifier. The radio frequency L-PA Mid device can support the receiving and the transmitting of low frequency signals of a plurality of frequency bands, and realize the receiving switching control, the transmitting switching control and the switching control between the transmitting and the receiving of the low frequency signals. The plurality of low frequency signals may include low frequency signals of different frequency bands among 2G signals, 3G signals, and 4G signals. Specifically, the frequency bands of the low-frequency signals may include at least two or any combination of B8, B12, B20, B26, B28A, B28B, B13, and B19, and at least include at least one overseas frequency band of B28A, B28B, B13, and B29. Therefore, the radio frequency L-PA Mid device in the embodiment of the present application may also be referred to as a Low frequency power amplifier module (Low Band PA Mid With LNA, LB L-PA Mid) With a built-in Low noise amplifier.

In one of the embodiments, the radio frequency L-PA Mid device may be understood as a package structure, and the radio frequency L-PA Mid device is configured with at least one transmitting port 4G LB RFIN and a plurality of receiving ports LNA OUT for connecting a radio frequency transceiver and at least one antenna port ANT for connecting an antenna. The receiving port LNA OUT, the transmitting port 4G LB RFIN and the antenna port ANT configured in the device can be understood as radio frequency pin terminals of a radio frequency L-PA Mid device, and are used for connecting with external devices. In particular, the receiving port LNA OUT and the transmitting port 4G LB RFIN may be used for connecting with a radio frequency transceiver. The antenna port ANT may be used for connection with an antenna. Illustratively, the transmitting port 4G LB RFIN is configured to receive a plurality of low-frequency signals transmitted by the radio frequency transceiver, and the radio frequency L-PA Mid device may perform filtering and amplifying processing on the plurality of input low-frequency signals to output the signals to the antenna interface, and transmit the signals through an antenna connected to the antenna port ANT, so as to implement transmission control on the plurality of low-frequency signals. The antenna port ANT is used for receiving a plurality of low-frequency signals received by the antenna, and the radio frequency L-PA Mid device can process, filter and amplify the plurality of input low-frequency signals to output the signals to the receiving port LNA OUT and output the signals to the radio frequency transceiver through the receiving port LNA OUT so as to realize the receiving control of the plurality of low-frequency signals.

Specifically, the radio frequency L-PA Mid device comprises: a transmitting module 110, a receiving module 120, a first switching unit 130 and a first control unit 140.

The transmitting module 110 includes an input terminal and a plurality of output terminals. The input end of the transmitting module 110 is connected to the transmitting port 4G LB RFIN, and the plurality of output ends of the transmitting module 110 are connected to the plurality of first ends of the first switch unit 130 in a one-to-one correspondence. Among them, the transmission port 4G LB RFIN, the transmission module 110, the first switching unit 130, and the antenna port ANT may constitute a plurality of transmission paths. That is, the transmitting module 110 receives a plurality of low frequency signals through the transmitting port 4G LB RFIN, amplifies and filters the received low frequency signals, and then selects any one of the low frequency signals from the plurality of low frequency signals after filtering and amplifying through the first switch unit 130 to output to the antenna port ANT, so as to implement switching transmission control of the plurality of low frequency signals.

The receiving module 120 includes a plurality of input terminals and at least one output terminal. A plurality of input ends of the receiving module 120 are connected to a plurality of first ends of the first switch unit 130 in a one-to-one correspondence manner, and are configured to receive a plurality of low-frequency signals and perform amplification and filtering processing on the received plurality of low-frequency signals, and at least one output end of the receiving module 120 is connected to at least one receiving port LNA OUT in a corresponding manner. The antenna port ANT, the first switch unit 130, the receiving module 120, and the receiving port LNA OUT may form a plurality of receiving paths. The receiving module 120 includes at least one low noise amplifier 121, and an output terminal of each low noise amplifier 121 is used as an output terminal of the receiving module 120. The filtered low-frequency signals are amplified by the low-noise amplifiers 121 and then output at least one low-frequency signal to the corresponding receiving port LNA OUT, so as to realize the switching receiving control of the low-frequency signals.

The first ends of the first switch unit 130 can be connected to the input ends of the receiving module 120 and the output ends of the transmitting module 110 in a one-to-one correspondence manner. The second end of the first switch unit 130 is connected to an antenna port ANT, and the first switch unit 130 can select a transmitting path or a receiving path for conducting any low frequency signal. For example, when the radio frequency L-PA Mid device is in a transmitting mode, the first switch unit 130 may be controlled to selectively conduct a path between the transmitting module 110 and the antenna port ANT to conduct a transmitting path of any low frequency signal, and when the radio frequency L-PA Mid device is in a receiving mode, the first switch unit 130 may be controlled to selectively conduct a path between the receiving module 120 and the antenna port ANT to conduct a receiving path of any low frequency signal.

It should be noted that, in the embodiment of the present application, in the radio frequency L-PA Mid device, a corresponding receiving path and a corresponding transmitting path are respectively configured for each low-frequency signal.

In one embodiment, a first terminal of the first switch unit 130 is connected to an input terminal of the receiving module 120 and/or an output terminal of the transmitting module 110. Specifically, the input terminal of the receiving module 120 and the output terminal of the transmitting module 110 are arranged in pairs. Further, the input/output terminals provided in pairs share the same transceiver terminal.

The first control unit 140 is connected to the at least one low-noise amplifier 121, and is configured to adjust a gain factor of the low-noise amplifier 121 to reduce a cascade noise factor of the at least one low-frequency signal receiving path.

In one embodiment, the first Control unit 140 may be a Mobile Industry Processor Interface (MIPI) -radio frequency Front End Control Interface (RFFE) Control unit. When the first control unit 140 is a MIPI-RFFE control unit, its radio frequency L-PA Mid device is also configured with an input pin CLK for a clock signal, an input or bi-directional pin SDATAS for a single/bi-directional data signal, a power supply pin VDD, a reference voltage pin VIO, and so on.

The receiving path of the rf L-PA Mid device is formed by a plurality of cascaded devices, such as an antenna port ANT, a first switch unit 130, a low noise amplifier 121 of the receiving module 120, and a receiving port LNA OUT, and the calculation formula of the cascaded noise coefficient is shown in formula 1:

NF-N1 + (N2-1)/G1+ (N3-1)/G1X G2+ (N4-1)/G1X G2X G3+ … (formula 1)

Where N1 to N4 represent the noise coefficients of the first stage to the fourth stage, respectively, and G1 to G3 represent the gains of the first stage to the third stage, respectively, the final cascade noise coefficient of the entire receiving path can be calculated by the formula (1). The noise figure of the low noise amplifier 121 can be changed by adjusting the gain figure of the low noise amplifier 121 in the receiving path, and thus the cascade noise figure can be changed.

Sensitivity is the minimum input signal level that the communication device can receive while meeting a certain Bit Error Rate (BER) performance. The 3GPP communication protocol specifies that, when testing the sensitivity index, the required bit error rate must be lower than 5%, i.e. Throughput is higher than 95%; under the above conditions, the minimum input level signal measured is the sensitivity of the communication device. The sensitivity can be calculated by a theoretical formula, and is specifically shown in formula (2):

sensitivity ═ 174+10lgBW + NF (equation 2)

BW refers to the bandwidth of the working frequency band of the communication device, and the unit is Hz; NF refers to the cascading noise figure of the communication device in dB. The sensitivity of the communication device can be correspondingly improved by reducing the cascade noise coefficient.

The receiving module 120, the transmitting module 110, and the first switch unit 130 are integrated in the radio frequency L-PA Mid device, so that transceiving control of a plurality of low-frequency signals can be realized, reception of low-frequency signals can be realized by avoiding externally arranging a corresponding switching circuit on the conventional radio frequency L-PA Mid device, the integration level of the radio frequency L-PA Mid device is improved, meanwhile, link loss on a receiving path can be reduced by omitting the externally arranged switching circuit, and a cascade noise coefficient of at least one low-frequency signal receiving path is reduced by adjusting a gain coefficient of the low-noise amplifier 121 in the receiving module 120, so that the sensitivity of the radio frequency L-PA Mid device can be improved.

As shown in fig. 2a, in one embodiment, the receiving module 120 further includes a plurality of receiving circuits 122 and a second switch unit 123. One receiving circuit 122 is correspondingly connected to one first end of the first switch unit 130, and the frequency band of the low-frequency signal output by each receiving circuit 122 is different. Specifically, each receiving circuit 122 may include a filter. The filter can filter the received low-frequency signal, wherein the filter only allows the low-frequency signal of the preset frequency band to pass through. For example, if the frequency bands of the low frequency signals can be eight different frequency bands, i.e., B8, B12, B20, B26, B28A, B28B, B13, and B19, eight receiving circuits 122 (i.e., eight filters) can be correspondingly disposed to implement the filtering process for the eight low frequency signals. After the filtering processing of the eight filters, the eight low frequency signals B8, B12, B20, B26, B28A, B28B, B13, and B19 can be correspondingly output to the second switch unit 123.

In one embodiment, the filter may be a band pass filter, a low pass filter, or the like. It should be noted that, in the embodiment of the present application, the type of the filter in each receiving circuit 122 is not further limited, and an appropriate filter may be selected according to the frequency band of the low-frequency signal to be filtered.

The second switch unit 123 includes a plurality of first terminals and at least one second terminal. A plurality of first terminals of the second switch unit 123 are connected to the plurality of receiving circuits 122 in a one-to-one correspondence, and are configured to receive the filtered plurality of low-frequency signals, and at least one second terminal of the second switch unit 123 is connected to an input terminal of the at least one low-noise amplifier 121 in a corresponding correspondence. The second switch unit 123 is configured to selectively turn on a path between the at least one second terminal and the plurality of first terminals, so as to simultaneously output at least one low frequency signal to the at least one low noise amplifier 121 connected thereto.

In one embodiment, the receiving module 120 includes a first low noise amplifier 121, a second switching unit 123, and a plurality of receiving circuits 122. The second switch unit 123 may include a plurality of first terminals and a second terminal. Illustratively, when there are eight receiving circuits 122, the second switching unit 123 may be a radio frequency SP8T switch. Eight selection terminals (i.e., first terminals) of the rf SP8T switch, one selection terminal is correspondingly connected to one receiving circuit 122, a single terminal (i.e., a second terminal) of the rf SP8T switch is connected to an input terminal of the first low noise amplifier 121, and an output terminal of the first low noise amplifier 121 is connected to any receiving port LNA OUT. The second switch unit 123 can select the eight received low frequency signals to turn on a path between any one of the receiving circuits 122 and the first low noise amplifier 121, thereby turning on a receiving path of a low frequency signal. The first control unit 140 is connected to the first low noise amplifier 121 and is configured to adjust a gain factor of the first low noise amplifier 121 to adjust a cascade noise factor of any receiving path.

As shown in fig. 2b, in one embodiment, the receiving module 120 includes a second switching unit 123, a plurality of receiving circuits 122, a second low noise amplifier 121a, a third low noise amplifier 121b and a third switching unit 124. The second switch unit 123 includes a plurality of first terminals and two second terminals, and the plurality of first terminals are connected to the plurality of receiving circuits 122 in a one-to-one correspondence. The input terminal of the second low noise amplifier 121a is connected to a second terminal of the second switching unit 123; an input terminal of the third low noise amplifier 121b is connected to another second terminal of the second switching unit 123. The second and third

low noise amplifiers

121a and 121b may be configured to amplify the received low frequency signal.

The third switching unit 124 is connected to the output terminal of the second low noise amplifier 121a, the output terminal of the third low noise amplifier 121b, and the two receiving ports LNA OUT, respectively. Specifically, the third switching unit 124 may be a radio frequency DPDT switch. Two first ends of the radio frequency DPDT switch are respectively connected to the output end of the second low noise amplifier 121a and the output end of the third low noise amplifier 121b, and two first ends of the radio frequency DPDT switch are respectively connected to the two receiving ports LNA OUT. The third switching unit 124 may be used to selectively output two low frequency signals to the rf transceiver.

As shown in fig. 3, in one embodiment, the second switching unit 123 includes a first SP4T switch 1231 and a second SP4T switch 1232. Wherein the four selection terminals of the first SP4T switch 1231 and the four selection terminals of the second SP4T switch 1232 serve as the plurality of second terminals of the second switch unit 123, and the single terminal of the first SP4T switch 1231 and the single terminal of the second SP4T switch 1232 serve as the two second terminals of the second switch unit 123. For example, the plurality of receiving circuits 122 connected to the four selection terminals of the first SP4T switch 1231 may include four filters for filtering four low frequency signals, i.e., B26, B8, B28A, and B28B, respectively, and the plurality of receiving circuits 122 connected to the four selection terminals of the first SP4T switch 1231 may include four filters for filtering four low frequency signals, i.e., B12, B20, B13, and B19, respectively.

The four filters connected to the first SP4T switch 1231 are used to filter the four low frequency signals having adjacent frequency bands, and the four filters connected to the second SP4T switch 1232 are used to filter the four low frequency signals having adjacent frequency bands. In the embodiment of the present invention, the four receiving circuits 122 connected to the first SP4T switch 1231 and the four receiving circuits 122 connected to the second SP4T switch 1232 are not limited to a specific one, and may be set according to actual needs.

In one embodiment, the first low noise amplifier 121, the second low noise amplifier 121a, and the third low noise amplifier 121b are gain-adjustable amplification devices. The first control unit 140 may be configured to adjust gain coefficients of the first low noise amplifier 121, the second low noise amplifier 121a, and the third low noise amplifier 121b, so as to reduce a cascade noise coefficient of each receiving path. Further, the first control unit 140 may also adjust the gain level of each low noise amplifier 121 according to the power value of the low frequency signal. For example, considering the in-band blocking scenario, a large signal may cause the in-band blocking, and the gain level of each low-noise amplifier 121 may be adjusted to avoid the power of the low-frequency signal approaching or exceeding the maximum input power of the radio frequency transceiver, which may cause damage to the radio frequency transceiver.

Based on the rf L-PA Mid device shown in fig. 2a, 2b, and 3, the gain of each of the

low noise amplifiers

121, 121a, and 121b can be adjusted, so as to reduce the cascade noise coefficient of any receiving channel, thereby improving the sensitivity of the rf L-PA Mid device. Meanwhile, the radio frequency L-PA Mid device can realize the transceiving control of eight low-frequency signals, namely B8, B12, B20, B26, B28A, B28B, B13 and B19, can avoid the arrangement of an additional switching circuit outside the radio frequency L-PA Mid device to support the transceiving control of overseas frequency bands, for example, B28A, B28B, B13 and B29, can improve the integration level of the radio frequency L-PA Mid device and reduce the cost, and meanwhile, because the receiving channels of the B28A, B28B, B13 and B29 are all arranged inside the radio frequency L-PA Mid device, can reduce the link loss of the receiving channels of the four low-frequency signals, namely B28A, B28B, B13 and B29, and can reduce the noise coefficient in cascade connection, and further improve the sensitivity of the radio frequency L-PA Mid device and can correspondingly reduce the power consumption of the radio frequency L-PA Mid device.

As shown in fig. 4, in one embodiment, on the basis of the rf L-PA Mid device shown in fig. 2a, the rf L-PA Mid device further includes: a fourth switching unit 125 and a first attenuator 126. Specifically, the fourth switching unit 125 is respectively connected to the output end of the first low noise amplifier 121, and at least one receiving port LNA OUT. The first attenuator 126 is connected to the fourth switching unit 125, and is configured to attenuate the low frequency signal output by the first low noise amplifier 121. Specifically, the fourth switch unit 125 may be an rf SPDT switch, a first end of the rf SPDT switch is connected to the output end of the first low noise amplifier 121, a second end of the rf SPDT switch is connected to a receiving port LNA OUT through the first attenuator 126, and another second end of the rf SPDT switch is directly connected to another receiving port LNA OUT. The fourth switching unit 125 may be configured to selectively turn on a direct path between the first low noise amplifier 121 and a receiving port LNA OUT, and may also be configured to selectively turn on a receiving path where the first attenuator 126 is located.

Optionally, the fourth switch unit 125 may further include a radio frequency DPDT switch, two first ends of the radio frequency DPDT switch are respectively and correspondingly connected to a second end of the radio frequency SPDT switch and the first attenuator 126, and two first ends of the radio frequency DPDT switch are respectively and correspondingly connected to the two receiving ports LNA OUT.

In the embodiment of the present application, the type and the number of the fourth switching units 125 are not limited as long as the receiving path on which the first attenuator 126 is located can be selected to be turned on.

In the radio frequency L-PA Mid device in this embodiment, the first attenuator 126 is disposed between the output end of the first low-noise amplifier 121 and the receiving port LNA OUT, and if the received low-frequency signal is a high-power signal, the attenuation coefficient of the first attenuator 126 may be correspondingly adjusted to increase the attenuation of the low-frequency signal, so as to avoid adverse effects on the radio frequency L-PA Mid device and/or the radio frequency transceiver due to too high power.

As shown in fig. 5, in one embodiment, the low noise amplifier 121 circuit further includes a fifth switch unit 127 and a second attenuator 128 on the basis of the radio frequency L-PA Mid device shown in fig. 3. Wherein, a control terminal of the fifth switching unit 127 is connected to the output terminal of the second low noise amplifier 121a, and a selection terminal of the fifth switching unit 127 is connected to the third switching unit 124; the other selection terminal of the fifth switching unit 127 is connected to the other second terminal of the third switching unit 124 through the second attenuator 128.

Specifically, the fifth switching unit 127 may be a radio frequency SPDT switch, and the third switching unit 124 is a radio frequency 3P3T switch. A first terminal (i.e., a control terminal) of the rf SPDT switch is connected to the output terminal of the second low noise amplifier 121a, a second terminal (i.e., a selection terminal) of the rf SPDT switch is connected to a second terminal of the rf 3P3T switch, another second terminal (i.e., another selection terminal) of the rf SPDT switch is connected to another second terminal of the third switch unit 124 through the second attenuator 128, and a second terminal of the rf 3P3T switch is connected to the output terminal of the third low noise amplifier 121 b. The fifth switch unit 127 may be configured to selectively turn on a direct path between the second low noise amplifier 121a and a receiving port LNA OUT, and may also be configured to selectively turn on a receiving path where the second attenuator 128 is located.

In the radio frequency L-PA Mid device in this embodiment, the second attenuator 128 is disposed between the output end of the second low noise amplifier 121a and the receiving port LNA OUT, and if the received low frequency signal is a high power signal, the attenuation coefficient of the second attenuator 128 may be correspondingly adjusted to increase the attenuation of the low frequency signal, so as to avoid adverse effects on the radio frequency L-PA Mid device and/or the radio frequency transceiver due to too high power.

In one embodiment, the radio frequency L-PA Mid device further includes a sixth switching unit and a third attenuator on the basis of the radio frequency L-PA Mid device shown in fig. 4. A control end of the sixth switching unit is connected to the output end of the third low noise amplifier 121b, and a selection end of the sixth switching unit is connected to the third switching unit 124; the other selection terminal of the sixth switching unit is connected to the other second terminal of the third switching unit 124 through the third attenuator. The sixth switching unit may be configured to selectively turn on a direct connection path between the third low noise amplifier 121b and a receiving port LNA OUT, and may also be configured to selectively turn on a receiving path where the third attenuator is located.

In the radio frequency L-PA Mid device in this embodiment, the third attenuator is disposed between the output end of the third low-noise amplifier 121b and the receiving port LNA OUT, and if the received low-frequency signal is a high-power signal, the attenuation coefficient of the third attenuator may be correspondingly adjusted to increase the attenuation of the low-frequency signal, so as to avoid adverse effects on the radio frequency L-PA Mid device and/or the radio frequency transceiver due to too high power.

In one embodiment, on the basis of the radio frequency L-PA Mid device shown in fig. 4, the radio frequency L-PA Mid device may further include a second attenuator 128, a third attenuator, a fifth switching unit 127 and a sixth switching unit. That is, the second attenuator 128 is disposed between the output end of the second low noise amplifier 121a and the receiving port LNA OUT, and the third attenuator is disposed between the output end of the third low noise amplifier 121b and the receiving port LNA OUT, so that if the received low frequency signal is a high power signal, the attenuation coefficients of the second attenuator 128 and the third attenuator can be correspondingly adjusted to increase the attenuation of the low frequency signal, so as to avoid the adverse effect of the excessively high power on the radio frequency L-PA Mid device and/or the radio frequency transceiver.

As shown in fig. 6 and 7, in one embodiment, the transmitting module 110 includes a first power amplifier 111, a seventh switching unit 112, and a plurality of transmitting circuits 113. The input end of the first power amplifier 111 is connected to a transmit port 4G LB RFIN, and is configured to amplify the received low-frequency signal.

The seventh switching unit 112 includes a first terminal and a plurality of second terminals. A first terminal of the seventh switching unit 112 is connected to the output terminal of the first power amplifier 111, and a plurality of second terminals of the seventh switching unit 112 are correspondingly connected to the plurality of transmitting circuits 113. The seventh switching unit 112 is used for selectively conducting a path between the first terminal and any one of the second terminals. An input terminal of a transmitting circuit 113 is correspondingly connected to a second terminal of the seventh switching unit 112, and an output terminal of a transmitting circuit 113 is correspondingly connected to a first terminal of the first switching unit 130. The transmitting circuits 113 are configured to perform filtering processing on the low-frequency signal amplified by the first power amplifier 111, and frequency bands of the low-frequency signal output by each transmitting circuit 113 are different.

Specifically, each transmitting circuit 113 may include a filter. The filter can filter the received low-frequency signal, wherein the filter only allows the low-frequency signal of the preset frequency band to pass through. For example, if the frequency bands of the low frequency signals can be eight different frequency bands, i.e., B8, B12, B20, B26, B28A, B28B, B13, and B19, eight transmitting circuits 113 (i.e., eight filters) can be correspondingly disposed to filter the eight low frequency signals. After the filtering processing of the eight filters, the eight low frequency signals B8, B12, B20, B26, B28A, B28B, B13, and B19 can be correspondingly output to the first switch unit 130.

In one embodiment, the filter may be a band pass filter, a low pass filter, or the like. It should be noted that, in the embodiment of the present application, the type of the filter in each transmitting circuit 113 is not further limited, and an appropriate filter may be selected according to the frequency band of the low-frequency signal to be filtered.

Wherein the transmitting circuit 113 and the receiving circuit 122 are provided in pair correspondence. That is, one transmission circuit 113 and one reception circuit 122 need to be provided for each low-frequency signal. That is, two filters need to be provided for each low-frequency signal, one filter for performing filtering processing on the low-frequency signal in the reception path, and the other filter for performing filtering processing on the low-frequency signal in the transmission path. For example, if the frequency bands of the low-frequency signals are eight different frequency bands, i.e., B8, B12, B20, B26, B28A, B28B, B13, and B19, eight pairs of the transmitting circuit 113 and the receiving circuit 122, i.e., 16 filters, are required. The output end of each pair of the transmitting circuits 113 and the input end of the receiving circuit 122 share the same port, that is, the output end and the input end of each pair of the transmitting circuits 113 and the receiving circuit 122 share the same port, that is, the output end and the receiving circuit include eight ports, and the eight ports are connected to the eight first ends of the first switches in a one-to-one correspondence.

Based on the rf L-PA Mid device shown in fig. 7, the transceiving control of the B28B signal is taken as an example for explanation:

emission control: the low-frequency signal enters through a transmitting port 4G LB RFIN of the L-PA Mid device, is amplified by the first power amplifier 111, and is output to a single port (i.e., a second end) of the seventh switching unit 112, a receiving path of the B28B signal is conducted by the seventh switching unit 112, the low-frequency signal is filtered by a filter in the transmitting circuit 113, and then a B28B signal is output to a first end of the first switching unit 130, a receiving path of the B28B signal is conducted by the first switching unit 130, and then a B28B signal is output to an antenna port ANT, so as to implement transmission control of the B28B signal.

Receiving and controlling: the low-frequency signal enters through an antenna port ANT of the L-PA Mid device, is switched to the receiving circuit 122 of the B28B through the first switch unit 130, is filtered by a corresponding filter, and then outputs a B28B signal to the first rf SP4T switch, and the receiving path of the B28B signal is switched through the first rf SP4T switch, so as to be input to the second low noise amplifier 121a, and then is switched to the third switch unit 124 through the fifth switch unit 127 from the output end of the second low noise amplifier 121a, and is switched to the receiving port LNA OUT through the third switch unit 124, so as to implement receiving control of the B28B signal, or is switched to the second attenuator 128 through the fifth switch unit 127, and then is switched to the receiving port LNA OUT through the third switch unit 124, so as to implement receiving control of the B28B signal.

As shown in fig. 6 and 7, in one embodiment, the rf L-PA Mid device is further configured with a coupling output port CLPOUT, and the rf L-PA Mid device further includes a coupling circuit 150 disposed in the transmit path. The coupling circuit 150 is used for coupling the low frequency signal in the transmission path to output a coupled signal through the coupled output port CLPOUT, and the coupled signal output by the coupling circuit can be used for measuring the forward coupling power and the reverse coupling power of the low frequency signal. Specifically, the coupling circuit 150 includes a coupling unit and a coupling switch. The coupling unit comprises an input end, an output end, a first coupling end and a second coupling end. Also, the coupling unit comprises a main line extending between the input and the output, and a secondary line extending between the first and the second coupling.

The input end of the coupling unit is connected to the first switch unit 130, the output end of the coupling unit 341 is connected to the antenna port ANT, and the first coupling end is configured to couple the low-frequency signal received by the input end and output a forward coupled signal; and the second coupling end is used for coupling the reflected signal of the low-frequency signal received by the output end and outputting a reverse coupling signal. Based on the forward coupling signal output by the first coupling end, the forward power information of the low-frequency signal can be detected; based on the reverse coupling signal outputted from the second coupling terminal, the reverse power information of the low frequency signal can be correspondingly detected, and the detection mode is defined as a reverse power detection mode.

The coupling switch is respectively connected with the first coupling end, the second coupling end and the coupling output port CLPOUT, and is used for selectively conducting a first coupling path of the first coupling end and the coupling output port CLPOUT to realize the detection of the forward power of the low-frequency signal and defining the detection mode as a reverse power detection mode, or conducting a second coupling path of the second coupling end and the coupling output port CLPOUT to realize the detection of the reverse power of the low-frequency signal and defining the detection mode as a reverse power detection mode. That is, the coupled switch is used to switch between a forward power detection mode and a reverse power detection mode.

In this embodiment, the radio frequency L-PA Mid device is provided with only one coupling output port CLPOUT, and since low-frequency signals of multiple frequency bands are not transmitted simultaneously, one coupling output port CLPOUT can also meet communication requirements, and also reduces the complexity of radio frequency routing inside the radio frequency L-PA Mid device, and can also improve the isolation performance of each routing of the radio frequency L-PA Mid device.

As shown in fig. 8 and 9, in one embodiment, the radio frequency L-PA Mid device further includes a second power amplifier 160, an input terminal of the second power amplifier 160 is connected to another transmission port 2G HB RFIN, and an output terminal of the second power amplifier 160 is connected to the first terminal of the first switching unit 130, for amplifying a low frequency band signal of the received 2G signal.

In the radio frequency L-PA Mid device in this embodiment, the second power amplifier 160 is provided, so that the transmission control of the low-frequency band signal of the 2G signal can be realized. The low-frequency band signal of the 2G signal may include a 900M frequency band of a GSM system, an 800M frequency band of a CDMA system, and the like.

In one embodiment, the radio frequency L-PA Mid device is further configured with a high frequency transmission port 4G HB RFIN, and the radio frequency L-PA Mid device further includes a third power amplifier 170, wherein an input terminal of the third power amplifier 170 is connected to the high frequency transmission port 4G HB RFIN, and an output terminal of the third power amplifier 170 is connected to the high frequency antenna port 4G HB OUT, for amplifying a high frequency band signal of the received 2G signal.

In the radio frequency L-PA Mid device in this embodiment, the third power amplifier 170 is provided, so that the transmission control of the high-frequency band signal of the 2G signal can be realized. The low-frequency band signal of the 2G signal may include a 900M frequency band of a GSM system, an 800M frequency band of a CDMA system, and the like.

In one embodiment, the radio frequency L-PA Mid device further comprises a second control unit 180. The second control unit 180 is connected to each of the switch units, for example, the first switch unit 130, the second switch units 123, …, the seventh switch circuit unit, the first power amplifier 111, the second power amplifier 160, and the third power amplifier 170, and is configured to control on/off of each of the switch units and to control an operating state of each of the power amplifiers.

The second control unit 180 is of the same type as the first control unit 140, and may be a MIPI-RFFE control unit, which conforms to the control protocol of the RFFE bus.

It should be noted that, in the embodiment of the present application, the control logic of each switch unit matches with the control logic of the first control unit 140 and the second control unit 180, and in the embodiment of the present application, specific types of each switch unit, the first control unit 140, and the second control unit 180 are not further limited.

In one embodiment, each device in the rf L-PA Mid device shown in fig. 8 can be integrally packaged in the same package module, and as shown in fig. 10a, each pin in the rf DRX device (package chip) corresponds to a plurality of ports configured in the rf L-PA Mid device. By package integration, the package specification of the rf L-PA Mid device is shown in fig. 10 b. Correspondingly, each device in the radio frequency L-PA Mid device shown in fig. 9 can be integrally packaged in the same package module, and as shown in fig. 11a, each pin in the radio frequency DRX device (package chip) corresponds to a plurality of ports configured in the radio frequency L-PA Mid device one to one. By package integration, the package specification of the rf L-PA Mid device is shown in fig. 11 b.

The radio frequency L-PA Mid device in the embodiment of the application has high integration level, can reduce the space occupied by each device and is convenient for miniaturization of the radio frequency L-PA Mid device.

As shown in fig. 12 and 13, an embodiment of the present application further provides a radio frequency transceiving system. In one embodiment, the rf transceiving system includes the rf L-PA Mid device 10, the first antenna Ant1 and the rf transceiver 20 in any of the foregoing embodiments.

In one embodiment, the first antenna Ant1 is connected to an antenna port Ant of the rf L-PA Mid device 10 for transceiving low-frequency signals. Specifically, the first antenna Ant1 may be formed using any suitable type of antenna. For example, the first antenna Ant1 may include an antenna with a resonant element formed from the following antenna structure: at least one of an array antenna structure, a loop antenna structure, a patch antenna structure, a slot antenna structure, a helical antenna structure, a strip antenna, a monopole antenna, a dipole antenna, and the like. Different types of antennas may be used for different frequency bands and frequency band combinations. In the embodiment of the present application, the type of the first antenna Ant1 is not further limited.

In the radio frequency transceiving system, by providing the radio frequency L-PA Mid device 10 in any of the embodiments, the link loss of the low frequency signal receiving path can be reduced, and the cascade noise coefficient of the receiving path is further reduced, so as to improve the sensitivity of the radio frequency transceiving system.

According to the requirements of the communication protocol 3GPP, the performance index requirements for the sensitivity of a part of frequency bands under the test bandwidth of 5MHz are shown in table 1 below.

Table 13 sensitivity index requirements of GPP protocol

Frequency band	B5	B8	B12	B13	B20	B28B	B28B
								Sensitivity (dBm)	-98	-97	-97	-97	-97	-98.5	-98.5

The rf transceiving system shown in fig. 12 is constructed based on the rf L-PA Mid device 10 shown in fig. 9. The rf transceiver system shown in fig. 12 illustrates the operation principle of the B28B signal:

emission control: the transmission signal is output from the rf transceiver 20 to the receiving port LNA OUT of the rf L-PA Mid device 10, amplified by the first power amplifier 111, transmitted to the single port of the seventh switch unit 112, switched to the transmission path of the B28B signal, filtered by the filter, and output to the B28B channel of the first switch unit 130, switched to the single port of the first switch unit 130, and then output to the first antenna ANT1 through the antenna port ANT of the rf L-PA Mid device 10.

Receiving and controlling: the receiving signal is switched from the first antenna Ant1 to the antenna port Ant of the rf L-PA Mid device 10, from the first switch unit 130 to the B28B channel, the B28B signal after filter filtering is output to the receiving path of the B28B signal, the receiving path of the B28B signal is conducted through the first rf SP4T switch to be input to the second low noise amplifier 121a, and then the output end of the second low noise amplifier 121a is switched to the third switch unit 124 through the fifth switch unit 127, and switched to the rf transceiver 20 through the third switch unit 124, or switched to the second attenuator 128 through the fifth switch unit 127, and then switched to the rf transceiver 20 through the third switch unit 124.

In combination with the sensitivity calculation formula, when the bandwidth of the working frequency band is determined, the noise coefficient of the receiving path directly affects the sensitivity index of the radio frequency transceiving system. Therefore, the noise figure of the reception path of the B28B signal was analyzed, as shown in table 2:

table 2 original scheme receiving link budget

In table 2, the insertion loss from the first antenna Ant1 to the radio frequency L-PA Mid device 10, including the antenna socket, the combiner, the switch and the routing, is 1.3 to 1.6dB within a frequency band of 699 to 915 MHz. The insertion losses of the first switch unit 130, the first rf SP4T switch, and the third switch unit 124 are shown in tables 3-5. The noise figure of the second low noise amplifier 121a is shown in table 6.

Table 3 insertion loss of the first switching element (rf SP8T switch)

Frequency of	Insertion loss
		704～960	0.65
1710～1980	0.8
		2110～2180	0.9

Table 4 first rf SP4T switch insertion loss

Frequency of	Insertion loss
		698～960	0.4
1710～1980	0.5
		2110～2180	0.5

Table 5 insertion loss of the third switching unit (radio frequency 3P3T switch)

Frequency of	Insertion loss
		704～960	0.7
1710～1980	0.8
		2110～2180	0.9

TABLE 6 second Low noise Amplifier parameter information

Device with a metal layer	Gain (dB)	Noise figure (dB)
			Index (I)	15.5	3

Trace 1 may be understood as a trace between the rf L-PA Mid device 10 and the rf transceiver 20, and its insertion loss is about 1 dB; the noise figure of the radio frequency transceiver 20 is 10 dB. As shown in Table 2, the obtained sensitivity is-101.5 dBm/5MHz, which is improved by 1.4dB compared with the traditional radio frequency transceiving system; meanwhile, the sensitivity index of the radio frequency transceiving system in the embodiment is higher than the requirement of-101 dBm/5MHz required by research and development.

Based on the receiving path budget in table 2, the influence of the second low noise amplifier 121a and the second attenuator 128 of the B28B signal receiving channel on the sensitivity index in response to different interference signals is calculated, as shown in table 7.

TABLE 7 sensitivity data

As can be seen from the analysis of the data in table 7, as the attenuation increases, the deterioration of the sensitivity due to the increase in the attenuation of the second attenuator 128 is larger than the effect of the decrease in the gain of the second low noise amplifier 121 a; it follows that to cope with blocking large signals, the gain can be reduced by the second low noise amplifier 121a, without using the second attenuator 128. The rf transceiver system shown in fig. 12 reduces the second attenuator 128 and the fifth switch unit 127, thereby making room for the layout of other modules, facilitating the performance optimization thereof, and reducing the cost.

As shown in fig. 14 and fig. 15, in one embodiment, the radio frequency transceiving system may further include a second antenna Ant2, wherein the second antenna Ant2 is connected to the high frequency transmitting port 4G LB RFIN of the radio frequency L-PA Mid device 10 in the foregoing embodiment, and is configured to transceive 2G high frequency signals.

The radio frequency transceiving system in the embodiment includes the first antenna Ant1 and the second antenna Ant2, so that transceiving control of a plurality of low-frequency signals can be realized, transmission control of high-frequency band signals in 2G signals can also be realized, and wireless communication performance of the radio frequency transceiving system is improved.

The embodiment of the application further provides a communication device, wherein the communication device is provided with the radio frequency transceiving system in any one of the embodiments, and the radio frequency transceiving system is arranged on the communication device, so that the sensitivity of the communication device for receiving low-frequency signals can be improved, and the wireless communication performance of the communication device is improved.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims

1. A radio frequency L-PA Mid device configured with at least one transmit port and a plurality of receive ports for connection to a radio frequency transceiver and at least one antenna port for connection to an antenna, the radio frequency L-PA Mid device comprising:

the transmitting module is connected with the transmitting port and used for receiving a plurality of low-frequency signals and amplifying and filtering the received low-frequency signals;

2. The radio frequency L-PA Mid device of claim 1, wherein the receiving module further comprises:

a plurality of receiving circuits, each of which is correspondingly connected to a first end of the first switch unit, and is used for filtering the received low-frequency signal, and the frequency bands of the low-frequency signal output by each of the receiving circuits are different;

the second switch unit is respectively connected with the receiving circuits and the input end of at least one low-noise amplifier, and is used for receiving a plurality of low-frequency signals and selecting at least one low-frequency signal to output.

3. The radio frequency L-PA Mid device of claim 2, wherein at least one of the low noise amplifiers comprises:

and the input end of the first low-noise amplifier is connected with the second switch unit, and the output end of the first low-noise amplifier is connected with one receiving port.

4. The radio frequency L-PA Mid device of claim 2, wherein the second switch unit includes a plurality of first terminals and two second terminals, the plurality of first terminals are connected to the plurality of receiving circuits in a one-to-one correspondence; wherein at least one of the low noise amplifiers comprises:

the input end of the second low noise amplifier is connected with a second end of the second switch unit;

a third low noise amplifier, an input terminal of which is connected to the other second terminal of the second switching unit;

and the third switching unit is respectively connected with the output end of the second low noise amplifier, the output end of the third low noise amplifier and the two receiving ports and is used for selectively outputting the low-frequency signals of the two frequency bands to the radio frequency transceiver.

5. The radio frequency L-PA Mid device of claim 4, wherein the second switching unit comprises:

a first SP4T switch, a control terminal of the first SP4T switch being connected to an input terminal of the second low noise amplifier, a plurality of selection terminals of the first SP4T switch being connected to a first number of the receiving circuits in a one-to-one correspondence;

a second SP4T switch, a control terminal of the second SP4T switch being connected to the input terminal of the third low noise amplifier, a plurality of selection terminals of the second SP4T switch being connected to a second number of the receiving circuits in a one-to-one correspondence; wherein a sum of the first number and the second number is less than or equal to a sum of the receiving circuits.

6. The radio frequency L-PA Mid device of claim 3, wherein the low noise amplifier circuit further comprises:

the fourth switching unit is respectively connected with the output end of the first low noise amplifier and at least one receiving port;

and the first attenuator is connected with the fourth switching unit and is used for attenuating the low-frequency signal output by the first low-noise amplifier.

7. The radio frequency L-PA Mid device of claim 4, wherein the low noise amplifier circuit further comprises:

a control end of the fifth switching unit is connected with an output end of the second low noise amplifier, and a first selection end of the fifth switching unit is connected with the third switching unit;

and the second attenuator is connected with the first selection end of the fifth switch unit and is used for attenuating the low-frequency signal output by the second low-noise amplifier.

8. The radio frequency L-PA Mid device of claim 7, wherein the low noise amplifier circuit further comprises:

a control end of the sixth switching unit is connected with an output end of the third low noise amplifier, and a first selection end of the sixth switching unit is connected with the third switching unit;

and the third attenuator is connected with the first selection end of the sixth switching unit and is used for attenuating the low-frequency signal output by the third low-noise amplifier.

9. The radio frequency L-PA Mid device of claim 1, wherein the transmit module comprises:

the input end of the first power amplifier is connected with one transmitting port and is used for amplifying the received low-frequency signal;

the transmitting circuits are used for filtering the received low-frequency signals, and the frequency bands of the low-frequency signals output by the transmitting circuits are different;

a first end of the seventh switching unit is connected with an output end of the first power amplifier, a plurality of second ends of the seventh switching unit are connected with input ends of the transmitting circuits in a one-to-one correspondence manner, and the seventh switching unit is used for selectively conducting a path between the first power amplifier and any transmitting circuit.

10. The radio frequency L-PA Mid device according to any of claims 1-9, wherein the frequency band of the low frequency signal comprises: b8, B12, B20, B26, B28A, B28B, B13, and B19 frequency bands.

11. The radio frequency L-PA Mid device according to claim 1, further comprising:

and the input end of the second power amplifier is connected with the other transmitting port, and the output end of the second power amplifier is connected with the first end of the first switch unit and used for amplifying the received 2G low-frequency signal.

12. The radio frequency L-PA Mid device according to claim 1, further configured with a high frequency transmit port and a high frequency antenna port, the radio frequency L-PA Mid device further comprising:

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

13. The radio frequency L-PA Mid device according to claim 1, further configured with a coupled output port, the radio frequency L-PA Mid device further comprising:

the coupling circuit is arranged in a transmitting path and used for coupling the low-frequency signal in the transmitting path so as to output a coupled signal through the coupling output port.

14. A radio frequency transceiver system, comprising:

the radio frequency L-PA Mid device of any of claims 1-13,

15. The rf transceiving system of claim 14, wherein the rf L-PA Mid device is configured with a high frequency transmit port, the rf transceiving system further comprising:

and the second antenna is connected with the high-frequency transmitting port and used for transceiving 2G high-frequency signals.

16. A communication device comprising a radio frequency transceiver system according to any one of claims 14-15.