CN115208429A

CN115208429A - Radio frequency system

Info

Publication number: CN115208429A
Application number: CN202210834066.5A
Authority: CN
Inventors: 潘柳澄
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-10-18

Abstract

The embodiment of the application discloses a radio frequency system. The radio frequency system includes: a radio frequency transceiver configured with a first transmit port, a second transmit port, and a feedback input port; the first transmitting branch is connected with the first transmitting port and used for processing a first transmitting signal output by the radio frequency transceiver; the second transmitting branch is connected with the second transmitting port and used for processing a second transmitting signal output by the radio frequency transceiver; the second coupling branch is coupled with the first transmitting branch and used for acquiring a first feedback signal corresponding to the first transmitting signal; the fourth coupling branch is coupled with the second transmitting branch and used for acquiring a second feedback signal corresponding to the second transmitting signal; the combiner comprises a first input port, a second input port and a combining output port, wherein the first input port is connected with a first coupling branch, the second input port is connected with a second coupling branch, and the combining output port is connected with a feedback input port.

Description

Radio frequency system

Technical Field

The present invention relates to the field of radio frequency communications, and more particularly, to a radio frequency system.

Background

With the maturity of 5G technology, operators and equipment manufacturers are establishing 5G networks nationwide, the 5G networks are initially networked with NSA (Non Stand Alone) and SA (Stand Alone), and can be covered with LTE (Long Term Evolution), and users implement Dual Connectivity of E-UTRA-NR Dual Connectivity, E-UTRA-NR. Wherein, E-UTRA refers to an Evolved UMTS (Universal Mobile Telecommunications System, terrestrial Radio Access) Universal Mobile Telecommunications System, which is called Evolved-UMTS Terrestrial Radio Access, and NR refers to New Radio communication, which is called New Radio.

When the terminal device operates in the endec mode, the terminal device may use the coupler as a Feedback signal Receiver (FBRX) to acquire a Feedback signal from the antenna, and use the Feedback signal to detect and control a radio frequency signal transmitted by the radio frequency front end device.

When a radio frequency system supports the transmission of radio frequency signals of multiple frequency bands, multiple FBRX signals are generated, and a switching device is required to be used as a hardware interface of the multiple FBRX signals, which is accessed to a radio frequency transceiver device, so that the hardware cost is high.

Disclosure of Invention

In order to solve any one of the above technical problems, an embodiment of the present application provides a radio frequency system, including:

a radio frequency transceiver configured with a first transmit port, a second transmit port, and a feedback input port;

the first transmitting branch is connected with the first transmitting port and used for processing a first transmitting signal output by the radio frequency transceiver;

the second transmitting branch is connected with the second transmitting port and used for processing a second transmitting signal output by the radio frequency transceiver;

the second coupling branch is coupled with the first transmitting branch and used for acquiring a first feedback signal corresponding to the first transmitting signal;

the fourth coupling branch is coupled with the second transmitting branch and used for acquiring a second feedback signal corresponding to the second transmitting signal;

the combiner comprises a first input port, a second input port and a combiner output port, wherein the first input port is connected with the second coupling branch, the fourth coupling branch is connected with the second input port, and the combiner output port is connected with the feedback input port.

The technical scheme has the following advantages or beneficial effects:

the feedback signal received by the input port of the combiner is output by the output port of the combiner, so that the purpose of transmitting the feedback signal is realized, the purpose of utilizing the combiner as a hardware interface of a multi-path feedback signal to be accessed into the radio frequency transceiver is realized, the combiner can be used for replacing a switch device, and the hardware cost is reduced.

Additional features and advantages of the embodiments of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the present application. The objectives and other advantages of the embodiments of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the examples of the embodiments of the present application do not constitute a limitation of the embodiments of the present application.

Fig. 1 is a schematic diagram of an FBRX detection scheme in a radio frequency system;

fig. 2 is a schematic diagram of an FBRX detection scheme based on Phase 7LE architecture in the related art;

FIG. 3 is a schematic diagram of a fixed coupling coefficient coupler;

FIG. 4 is a schematic diagram of the connection of a coupler in the architecture of FIG. 2;

fig. 5 is a first schematic diagram of a radio frequency system according to an embodiment of the present application;

fig. 6 (a) is a second schematic diagram of a radio frequency system according to an embodiment of the present application;

fig. 6 (b) is a third schematic diagram of a radio frequency system according to an embodiment of the present application;

fig. 6 (c) is a schematic diagram of a first application of the rf system according to the embodiment of the present application;

fig. 7 is a comparison diagram of the working principle of the combiner and the SP 4T;

fig. 8 (a) is a fourth schematic diagram of a radio frequency system according to an embodiment of the present application;

fig. 8 (b) is a fifth schematic diagram of a radio frequency system according to an embodiment of the present application;

fig. 8 (c) is a schematic diagram of path switching provided in the embodiment of the present application;

fig. 8 (d) is a schematic diagram of a second application of the radio frequency system according to the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, in the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.

Fig. 1 is a schematic diagram of an FBRX signal in a radio frequency system. As shown in fig. 1, a coupler (coupler, CPL) is used to acquire an FBRX signal, so as to detect and control a transmission signal, which is implemented as follows:

the transmission signal is generated by a waveform generator (TXwave) and passed through a digital power amplifier (G) of the transmission signal _DIGtx ) And an analog power amplifier (G) _tx ) And then transmitted by the antenna.

And sampling the transmission signal by utilizing a radio frequency input interface of the CPL, and outputting the FBRX signal through a coupling output end.

The FBRX signal passes through an analog power amplifier (G) of the FBRX signal in turn _FBRX ) Digital power amplifier (G) for FBRX signals, analog-to-Digital Converter (ADC) _DIG ) And then enters an Inner Loop Power Control (ILPC) receiver.

The ILPC receiver detects the size and quality of the FBRX signal and feeds back the detected signal to a digital power amplifier (G) for transmitting the signal _DIGtx ) Power control is accomplished, wherein the power control includes control of signal size and/or signal quality.

Fig. 2 is a schematic diagram of an FBRX detection scheme based on a Phase 7LE architecture in the related art. As shown in fig. 2, the rf system includes 3 PAMID (PA Module integrated with Duplexer); wherein:

the Low frequency (LB) PAMID integrates a module of a Low frequency (LB 2G/3G/4G/NR) power Amplifier, a filter, a switch and a Low Noise Amplifier (LNA) for signal receiving (Receive, RX).

The MHB (Middle High Band, MHB) PAMID integrates a module of a MHB 3G/4G/NR (Mobile High Band/High frequency/low noise amplifier), a filter, a switch and an RX LNA (low-frequency amplifier).

An Ultra-High Band (UHB) PAMID module integrating a 5G (UHB N77/N78/N79) power amplifier, a filter, a switch and an RX LNA.

Specifically, the rf system includes an

rf transceiver

10, 4 transmitting branches, 4 CPLs and SP4T (Single Pole Four-way, single Pole Four-Throw); wherein:

a radio frequency transceiver 10 having a first transmit port TX1, a second transmit port TX2, a third transmit port TX3 and a fourth transmit port TX4 and a feedback input port FB; wherein:

a first transmission port TX1 for transmitting an LB signal, such as a B5 band;

a second transmission port TX2 for transmitting UHB signals, such as N77 band;

a third transmit port TX3 for transmitting an HB signal, such as an endec N41 band;

a fourth transmit port TX4 for transmitting MB signals, such as B3 signals;

and the feedback input port FB is used for receiving a feedback signal corresponding to the first radio frequency signal, the second radio frequency signal, the third radio frequency signal or the fourth radio frequency signal.

4 transmitting branches, namely a first transmitting branch 21, a second transmitting branch 22, a third transmitting branch 23 and a fourth transmitting branch 24; wherein:

the first transmitting branch 21 includes an LB PAMID, and is connected to the radio frequency transceiver 10 through a first transmitting port TX1, and configured to process an LB signal;

the second transmitting branch 22 includes a UHB PAMID, and is connected to the radio frequency transceiver 10 through a second transmitting port TX2, for processing the UHB signal;

the third transmitting branch 23 includes MHB PAMID, and is connected to the radio frequency transceiver 10 through a third transmitting port TX3, and is configured to process HB;

the fourth transmitting branch 24 includes an MHB PAMID, and is connected to the rf transceiver 10 through a fourth transmitting port TX4 for processing the MB signal;

4 CPLs, namely CPL1, CPL2, CPL3 and CPL4; wherein:

the CPL1 is coupled with the third transmitting branch and is used for acquiring a feedback signal FBRX _ HB corresponding to the HB signal;

the CPL2 is coupled with the first transmitting branch 21 and used for acquiring a feedback signal FBRX _ LB corresponding to the LB signal;

CPL3, coupled to the fourth transmitting branch 24, and configured to acquire a feedback signal FBRX _ MB corresponding to the MB signal;

and CPL4, coupled to the second transmitting branch 22, and configured to acquire a feedback signal FBRX _ UHB corresponding to the UHB signal.

SP4T having 4 first terminals (RFIN 1, RFIN2, RFIN3 and RFIN 4) and 1 second terminal RFOUT, wherein:

RFIN1, connected to CPL2, for receiving feedback signal FBRX _ LB;

RFIN2, connected to CPL4, for receiving feedback signal FBRX _ UHB;

RFIN3, connected to CPL1, for receiving feedback signal FBRX _ HB;

RFIN4, connected to CPL3, for receiving feedback signal FBRX _ MB;

RFOUT, for receiving feedback signals output from 4 input ports.

In the above radio frequency system, in order to ensure that the FBRX functions normally, the radio frequency system uses 4 CPLs, which include an external CPL and three internal CPLs. Each signal has an independent CPL for FBRX detection, and finally passes through SP4T and is input into a radio frequency transceiver (Transciver).

The external CPL is CPL1 and is used for coupling high-frequency signals.

Fig. 3 is a schematic diagram of a coupler with a fixed coupling coefficient. As shown in fig. 3, the external CPL is a passive coupler, and can only perform coupling operation. The passive coupler cannot be controlled because its operating characteristics determine that it has only one fixed operating state.

The embedded CPL is a CPL integrated in the PAMID, when the PAMID works, the CPL has 4 working states which are respectively an OFF (OFF), a forward coupling Forward (FWD), a reverse coupling Reverse (REV) and a bypass (bypass) state, wherein:

detecting the transmitted signals according to different slots of different transmission frames, wherein only one signal is detected each time, the time of each detection can be 20us, and the working state at the moment is an FWD state;

when the coupler does not work, the working state is an OFF state;

controlling the CPL to be in the REV state while managing a tuner (tuner) of the antenna;

when the coupler is used as a pass-through transmission device, the working state is bypass state, and the state can be used for cascading with other CPLs.

Fig. 4 is a connection diagram of a coupler in the architecture shown in fig. 2. As shown in fig. 4, in the application of the scheme shown in fig. 2, 4 CPLs are connected in parallel to the SP4T, and are combined by the SP4T and then input to the radio frequency transceiver, where the CPL connection mode may be referred to as parallel connection.

As can be seen from the structures shown in fig. 2 and 4, the above-described architecture has the following problems, including:

since the rf transceiver has only one feedback input port FB, when multiple CPLs are used in the actual rf application scheme, one SP4T must be used for combining, which increases the cost.

During normal operation, when FBRX detection is performed on the SA signal, SP4T is in an operating state only 20us of the operation of CPL, and is in an OFF state for the rest of time. And the circuit is always periodically cycled for 6ms, and the non-linearity is generated by the constant switching of the switch, so that low-frequency noise is brought, namely the noise of the transmitted signal falls in a receiving frequency band. Causing deterioration of low-frequency reception sensitivity.

In addition, the SP4T is a device that needs radio frequency control, and the operation of the device is controlled by radio frequency software to be in different operation states, i.e., OFF and ON (RFIN 1, RFIN2, RFIN3, RFIN 4), which inevitably causes consumption of electric energy.

Based on the above analysis, the embodiments of the present application provide the following solutions, including:

fig. 5 is a first schematic diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 5, the radio frequency system includes a radio frequency transceiver 10, a first transmitting branch 21, a second transmitting branch 22, a second coupling branch 32, a fourth coupling branch 34, and a combiner 40.

The radio frequency transceiver 10 may have a plurality of transmission ports, each for outputting a radio frequency signal of a different frequency band.

Specifically, the radio frequency transceiver 10 has a first transmission port TX1 and a second transmission port TX2, where the first transmission port TX1 is used to output a first radio frequency signal; the second radio frequency port is used for outputting a second radio frequency signal. The first radio frequency signal may be a radio frequency signal of the same network, or a signal of a different network, and both the first radio frequency signal and the second radio frequency signal are 4G or 5G signals, or one of the first radio frequency signal and the second radio frequency signal is a 4G signal and the other is a 5G signal.

In addition, the radio frequency transceiver 10 further has a feedback input port FB for receiving a feedback signal.

Specifically, the feedback input port FB may receive a first feedback signal corresponding to the first transmission signal or a second feedback signal corresponding to the second transmission signal.

A first transmitting branch 21, configured to process a first transmitting signal output by the radio frequency transceiver 10;

specifically, the first transmitting branch 21 is connected to the radio frequency transceiver 10 through the first transmitting port TX1, receives a first transmitting signal from the first transmitting port TX1, amplifies and filters the received first transmitting signal, and transmits the amplified first transmitting signal.

A second transmitting branch 22, configured to process a second transmitting signal output by the radio frequency transceiver 10;

specifically, the second transmitting branch 22 is connected to the radio frequency transceiver 10 through the second transmitting port TX2, receives a second transmitting signal from the second transmitting port TX2, amplifies and filters the received second transmitting signal, and transmits the amplified second transmitting signal.

The second coupling branch 32 performs coupling processing on the received first transmit signal through coupling with the first transmit branch 21, and uses a signal obtained through the coupling processing as a first feedback signal, so as to realize acquisition of the first feedback signal corresponding to the first transmit signal.

The fourth coupling branch 34 couples the second transmitting signal received by the second transmitting branch 22, and uses the signal obtained by the coupling processing as a second feedback signal, so as to acquire the second feedback signal corresponding to the second transmitting signal.

The combiner 40 has a plurality of input ports and a combined output port RFOUT.

Specifically, the combiner 40 includes a first input port RFIN1 and a second input port RFIN2, where the first input port RFIN1 is connected to the second coupling branch 32, and is configured to receive the first feedback signal output by the second coupling branch 32; the second input port RFIN2 is connected to the fourth coupling branch 34, and is configured to receive the second feedback signal output by the fourth coupling branch 34.

The combining output port RFOUT is connected to the feedback input port FB of the radio frequency transceiver 10, and is configured to output the signal received by the input port of the combiner 40 to the radio frequency transceiver 10.

The combiner 40 outputs the feedback signal received at the input port of the combiner 40.

Specifically, the combiner 40 may receive a feedback signal through one of the first input port RFIN1 and the second input port RFIN2, and output the received feedback signal to the feedback input port FB of the radio frequency transceiver 10 through the combined output port RFOUT.

The related art adopts SP4T to control one feedback signal received at any time to be output to the rf transceiver 10. The combiner 40 is used for combining the multiple signals received by the input ports and outputting the combined signals. In the radio frequency system provided in the embodiment of the present application, the feedback signal received by the input port of the combiner 40 only has one path at any time, so that combining processing of multiple paths of signals is not required, and the combiner 40 can replace a switch device to achieve the purpose of transmitting the feedback signal.

As known from the detection mechanism of FBRX, there is only one feedback signal at the same time. Specifically, when the radio frequency system operates in the SA mode, the radio frequency system has only one radio frequency signal, and correspondingly has only one feedback signal, and the input port of the combiner 40 receives only one feedback signal. When the radio frequency system operates in the NSA mode, two paths in the NSA mode perform FBRX detection in a time-sharing manner, so that only one feedback signal exists at any time, and only one feedback signal is received by the input port of the combiner 40. Based on the detection mechanism of FBRX, the signal received by the combiner 40 has only one path at any time, there is no case of combining the multiple paths of signals,

feedback signals received in the first input port RFIN1 and the second input port RFIN2 are output through the combiner 40 through the combiner output port RFOUT, so that the purpose of transmitting the feedback signals is achieved, the combiner 40 is used for replacing a switch device, and the hardware cost is saved.

Fig. 6 (a) is a second schematic diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 6 (a), the radio frequency system further includes a third transmitting branch 23 and a first coupling branch 31; wherein:

the rf transceiver 10 is further configured with a third transmitting port TX3 for outputting a third rf signal.

A third transmitting branch 23, configured to process a third transmitting signal output by the radio frequency transceiver 10;

specifically, the third transmitting branch 23 is connected to the radio frequency transceiver 10 through the third transmitting port TX3, receives a third transmitting signal from the third transmitting port TX3, amplifies and filters the received third transmitting signal, and transmits the amplified third transmitting signal.

The first coupling branch 31 couples with the third transmitting branch 23 to perform coupling processing on the received third transmitting signal, and the signal obtained through the coupling processing is used as a third feedback signal, so as to realize acquisition of the third feedback signal corresponding to the third transmitting signal.

The combiner 40 further includes a third input port RFIN3 connected to the first coupling branch 31, and configured to receive a third feedback signal output by the first coupling branch 31.

The combiner 40 may receive a feedback signal through one of the first input port RFIN1, the second input port RFIN2, and the third input port RFIN3, and output the received feedback signal to the feedback input port FB of the radio frequency transceiver 10 through the combined output port RFOUT.

Fig. 6 (b) is a third schematic diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 6 (b), the rf system further includes a fourth transmitting branch 24 and a third coupling branch 33; wherein:

the rf transceiver 10 is further configured with a fourth transmitting port TX4 for outputting a fourth rf signal.

A third transmitting branch 23, configured to process a fourth transmitting signal output by the radio frequency transceiver 10;

specifically, the fourth transmitting branch 24 is connected to the radio frequency transceiver 10 through the fourth transmitting port TX4, receives a fourth transmitting signal from the fourth transmitting port TX4, amplifies and filters the received fourth transmitting signal, and transmits the amplified fourth transmitting signal.

The third coupling branch 33 couples with the fourth transmitting branch 24 to perform coupling processing on the received fourth transmitting signal, and the signal obtained through the coupling processing is used as a fourth feedback signal, so as to realize acquisition of the fourth feedback signal corresponding to the fourth transmitting signal.

The combiner 40 further includes a fourth input port RFIN4 connected to the third coupling branch 33, and configured to receive a fourth feedback signal output by the third coupling branch 33.

The combiner 40 may receive a feedback signal through one of the first input port RFIN1, the second input port RFIN2, the third input port RFIN3, and the fourth input port RFIN4, and output the received feedback signal to the feedback input port FB of the radio frequency transceiver 10 through the combined output port RFOUT.

Fig. 6 (c) is a schematic diagram of a first application of the radio frequency system according to the embodiment of the present application. As shown in fig. 6 (c), the radio frequency system includes a

radio frequency transceiver

10, 4 transmitting branches, 4 CPLs, and a combiner 40; wherein:

a first transmission port TX1 for transmitting an LB signal, such as a B5 band;

a second transmission port TX2 for transmitting UHB signals, e.g., N77 band;

a third transmitting port TX3 for transmitting an HB signal, such as an endec N41 band;

a fourth transmit port TX4 for transmitting MB signals, such as B3 signals;

4 CPLs, namely a first coupling device 31, a second coupling device 32, a third coupling device 33 and a fourth coupling device 34, respectively, wherein in fig. 6 (c), the first coupling device 31 is CPL1, the second coupling device 32 is CPL2, the third coupling device 33 is CPL3, and the fourth coupling device 34 is CPL4; wherein:

the CPL1 is coupled with the third transmitting branch 23 and is used for acquiring a feedback signal FBRX _ HB corresponding to the HB signal;

CPL2, coupled to the first transmitting branch 21, and configured to acquire a feedback signal FBRX _ LB corresponding to the LB signal;

and CPL4, coupled to the second transmitting branch 22, for acquiring a feedback signal FBRX _ UHB corresponding to the UHB signal.

A combiner 40 having 4 input ports (RFIN 1, RFIN2, RFIN3, and RFIN 4) and 1 combined output port RFOUT, wherein:

RFIN1, connected to CPL2, for receiving feedback signal FBRX _ LB;

RFIN2, connected to CPL4, for receiving feedback signal FBRX _ UHB;

RFIN3, connected to CPL1, for receiving feedback signal FBRX _ HB;

RFIN4, connected to CPL3, for receiving feedback signal FBRX _ MB;

RFOUT, for receiving feedback signals output from 4 input ports.

In the configuration shown in fig. 6 (c), the transmission of the feedback signals of the 4 transmitting branches is completed by the combiner 40 instead of the SP4T.

The combiner and the SP4T have the following differences, including:

1. difference in loss

The more the number of the combiners of the combiner is, the larger the corresponding loss is, but the loss of the combiner can be compensated back through FBRX calibration, so that the working effect of the combiner in the radio frequency system is not influenced.

2. Different isolation

The isolation between adjacent input ports in the combiner is 35dB, and taking fig. 6 (c) as an example, the isolation between the first input port RFIN1 and the second input port RFIN2 is 35dB. The coupling of SP4T is 45dB. Although the coupling degree of the combining path is lower than that of SP4T, the isolation degree can completely meet the use requirement of a radio frequency system.

Taking the application scenario shown in fig. 6 (c) as an example, when operating in the NSA mode, the frequency bands are B3 and N41, and the maximum power difference is 0+ 26dbm. The transmitting power of N41 is 26dBm, the coupling coefficient of CPL1 is 25dB, after CPL1 coupling, the power of feedback signal of N41 is 1dBm, transmission line loss is 1dB, PFBRX N41 leaked to FRBX4 link is-35 dBm, then coupled to transmitting branch of B3 from CPL3, its power is-60 dBm, and is far less than 0dBm of TX power of B3,

3. the working principle is different.

Fig. 7 is a schematic diagram comparing the operation principle of the combiner and the SP4T. As shown in fig. 7, one end of the SP4T is connected to the coupling output ends of the 4 CPLs, and the other end is connected to the feedback input port FB of the rf transceiver 10, so that only one path is conducted each time. The combiner 40 directly combines all the RFINs 1 to 4 together for output. In the FBRX detection, the SA mode only has one signal, the NSA mode two TX signals are time-division detection, and only one signal exists at the same time. It is possible to use the combiner 40 instead of the SP4T.

This scheme uses the combiner to replace SP4T, need not to carry out periodic switching, avoids disturbing the production from the source, can avoid the deterioration of low frequency receiving sensitivity.

When all the coupling branches are connected to the combiner 40, strict design requirements are imposed on the layout of the traces of the coupling branches, and therefore, the trace distance between the coupling branches needs to be shortened as much as possible. For convenience of use, the FBRX link may be cascaded by a part of the coupling circuit, so that at most two links are allowed to be parallel and output to the rf transceiver 10 through the combiner 40.

Fig. 8 (a) is a fourth schematic diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 8 (a), the rf system further includes a third transmitting branch 23, a first coupling branch 31 and a second pass-through branch; wherein:

A second straight-through branch 52 connected to the first coupling branch 31, configured to directly output the third feedback signal output by the first coupling branch 31, and output the third feedback signal to the combiner 40 through the first input port RFIN1 of the combiner 40;

the first input port RFIN1 of the combiner 40 can be connected to the second coupling branch 32, and in this embodiment, can also be connected to the second straight-through branch 52 for receiving the third feedback signal output by the second straight-through branch 52, so that the first input port RFIN1 is switchably connected to the second straight-through branch 52 and the second coupling branch 32.

If the second straight-through branch 52 has signal transmission, the first input port RFIN1 and the second straight-through branch 52 are in a conducting state, so that the second straight-through branch 52 can output a third feedback signal to the combiner 40; if the second coupling branch 32 has a signal transmission, the first input port RFIN1 and the second coupling branch 32 are in a conducting state, so that the second coupling branch 32 can output a first feedback signal to the combiner 40.

Specifically, when the radio frequency system operates in the SA mode, the radio frequency system has only one radio frequency signal and only one corresponding feedback signal, and if the radio frequency signal is the first transmit signal, the second coupling branch 32 acquires the first feedback signal corresponding to the first transmit signal and outputs the first feedback signal to the combiner 40 through the first input port RFIN1; if the radio frequency signal is a third transmission signal, the first coupling branch 31 collects a third feedback signal corresponding to the third transmission signal, and outputs the third feedback signal to the first input port RFIN1 through the second through branch 52, so that the combiner 40 receives the third feedback signal through the first input port RFIN1. From the above analysis, it can be seen that the first input port RFIN1 is capable of supporting the reception of the first feedback signal and the third feedback signal when the radio frequency system is operating in the SA mode.

When the radio frequency system works in the NSA mode, two paths of transmitting signals in the NSA mode are subjected to time division FBRX detection, so that only one path of feedback signal exists at the same time. Taking two different detection times as a time t1 and a time t2, respectively, for example, if the detection of the first transmit signal is performed at the time t1, the second coupling branch 32 collects a first feedback signal corresponding to the first transmit signal and outputs the first feedback signal to the combiner 40 through the first input port RFIN1; if the detection of the third transmission signal is performed at the time t2, the first coupling branch 31 collects a third feedback signal corresponding to the third transmission signal and outputs the third feedback signal to the first input port RFIN1 through the second through branch 52, so that the combiner 40 receives the third feedback signal through the first input port RFIN1. From the above analysis, it can be seen that the first input port RFIN1 is capable of supporting the reception of the first feedback signal and the third feedback signal when the radio frequency system is operating in the NSA mode.

Based on the above analysis, the first input port RFIN1 is switchably connected to the second straight-through branch 52 and the second coupling branch 32, so that the first input port RFIN1 can receive the third feedback signal through the second straight-through branch 52, and can receive the first feedback signal through the second coupling branch 32, so that the first input port RFIN1 has a function of receiving the first feedback signal and the third feedback signal.

When the radio frequency system has 3 coupling branches, the receiving function of 3 feedback signals can be completed only by providing two input ports by the combiner 40, the requirement on the number of the input ports of the combiner 40 is effectively reduced, and the hardware cost of the combiner 40 is reduced.

Fig. 8 (b) is a fifth schematic diagram of a radio frequency system according to an embodiment of the present application. As shown in fig. 8 (b), the fourth transmitting branch 24, the third coupling branch 33 and the fourth straight-through branch 54; wherein:

A fourth transmitting branch 24, configured to process a fourth transmitting signal output by the radio frequency transceiver 10;

The third coupling branch 33 couples with the fourth transmitting branch 24 to perform coupling processing on the received fourth transmitting signal, and uses the signal obtained through the coupling processing as a fourth feedback signal, so as to realize acquisition of the fourth feedback signal corresponding to the fourth transmitting signal.

A fourth straight-through branch 54 connected to the third coupling branch 33, configured to directly output the fourth feedback signal output by the third coupling branch 33, and output the fourth feedback signal to the combiner 40 through the first input port RFIN1 of the combiner 40;

the second input port RFIN2 is switchably connected to said fourth straight-through branch 54 and to the fourth coupling branch 34.

If the fourth straight-through branch 54 has a signal transmission, the second input port RFIN2 and the fourth straight-through branch 54 are in a conducting state, so that the fourth straight-through branch 54 can output a fourth feedback signal to the combiner 40; if the fourth coupling branch 34 has signal transmission, the second input port RFIN2 and the fourth coupling branch 34 are in a conducting state, so that the fourth coupling branch 34 can output a second feedback signal to the combiner 40.

Specifically, when the radio frequency system operates in the SA mode, the radio frequency system has only one radio frequency signal and only one corresponding feedback signal, and if the radio frequency signal is a second transmit signal, the fourth coupling branch 34 collects a second feedback signal corresponding to the second transmit signal and outputs the second feedback signal to the combiner 40 through the second input port RFIN 2; if the radio frequency signal is a fourth transmission signal, the third coupling branch 33 collects a fourth feedback signal corresponding to the fourth transmission signal, and outputs the fourth feedback signal to the second input port RFIN2 through the fourth through branch 54, so that the combiner 40 receives the fourth feedback signal through the second input port RFIN 2. From the above analysis, it can be seen that the second input port RFIN2 is capable of supporting the reception of the second feedback signal and the fourth feedback signal when the radio frequency system is operating in the SA mode.

When the radio frequency system works in the NSA mode, two paths of transmitting signals in the NSA mode are subjected to time division FBRX detection, so that only one path of feedback signal exists at the same time. Taking two different detection times as the t1 time and the t2 time as an example, if the detection of the second transmission signal is performed at the t1 time, the fourth coupling branch 34 collects a second feedback signal corresponding to the second transmission signal and outputs the second feedback signal to the combiner 40 through the second input port RFIN 2; if the detection of the fourth transmission signal is performed at the time t2, the third coupling branch 33 collects a fourth feedback signal corresponding to the fourth transmission signal and outputs the fourth feedback signal to the second input port RFIN2 through the fourth through branch 54, so that the combiner 40 receives the fourth feedback signal through the second input port RFIN 2. From the above analysis, the second input port RFIN2 is capable of supporting the reception of the second feedback signal and the fourth feedback signal when the radio frequency system operates in the NSA mode.

Based on the above analysis, the second input port RFIN2 is switchably connected to the fourth straight-through branch 54 and the fourth coupling branch 34, so that the second input port RFIN2 can receive the fourth feedback signal through the fourth straight-through branch 54, and can receive the second feedback signal through the fourth coupling branch 34, so that the second input port RFIN2 has a function of receiving the second feedback signal and the fourth feedback signal.

When the radio frequency system has 4 coupling branches, the receiving function of 4 feedback signals can be completed only by providing two input ports by the combiner 40, so that the requirement on the number of the input ports of the combiner 40 is effectively reduced, and the hardware cost of the combiner 40 is reduced.

Further, the second through branch 52 and the second coupling branch 32 are integrated in the same coupling device; and/or; the fourth through branch 54 and the fourth coupling branch 34 are integrated in the same coupling device, so as to improve the integration of the circuit.

Specifically, the coupling device may have a signal input terminal, a coupling input terminal, a through branch, a coupling branch, and a coupling output terminal; wherein:

the signal input end is used for receiving a feedback signal;

the coupling input end is used for receiving a transmission signal;

the straight-through branch is connected with the signal input end;

the coupling branch is connected with the coupling input end and is used for acquiring a feedback signal corresponding to a transmission signal to obtain another feedback signal;

and the coupling output end is switchably connected with the through branch or the coupling branch and is used for outputting a feedback signal or another feedback signal.

Taking the coupling devices corresponding to the second through branch 52 and the second coupling branch 32 as an example, if the signal input end receives a third feedback signal, the third feedback signal is output to the coupling output end through the through branch, and is output to the first input port RFIN1 of the combiner 40 by the coupling output end; if the coupling input section receives the first transmit signal, the coupling branch acquires a first feedback signal corresponding to the first transmit signal, and outputs the first feedback signal to the coupling output terminal, and the first feedback signal is output from the coupling output terminal to the first input port RFIN1 of the combiner 40.

Similarly, the working principle of the coupling devices corresponding to the fourth through branch 54 and the fourth coupling branch 34 is not described herein again.

Furthermore, the coupling device with low frequency can be far away from the combiner 40, so as to reduce the interference caused by the operation of the combiner 40 to the coupling device.

Since the first input port RFIN1 is switchably connected to the second coupling branch 32 or the second through branch 52, and the first coupling branch 31 is connected to the first input port RFIN1 through the second through branch 52, the distance from the second coupling branch 32 to the combiner 40 is shorter than the distance from the first coupling branch 31, and therefore, the operating frequency of the first coupling branch 31 is lower than the operating frequency of the second coupling branch 32, so that the low-frequency coupling device is far away from the combiner 40, and the interference caused by the operation of the combiner 40 to the coupling device is reduced.

Since the second input port RFIN2 is switchably connected to the fourth coupling branch 34 or the fourth through branch 54, and the third coupling branch 33 is connected to the second input port RFIN2 through the fourth through branch 54, the distance from the fourth coupling branch 34 to the combiner 40 is shorter than the distance from the third coupling branch 33, and therefore, the operating frequency of the third coupling branch 33 is lower than the operating frequency of the fourth coupling branch 34, so that the low-frequency coupling device is far away from the combiner 40, and the interference caused by the operation of the combiner 40 to the coupling device is reduced.

The coupling device may be an active coupler. Based on the operating characteristics of the active coupler, it has a through state, and thus, it is possible to control whether the operating state of the active coupler is in the through state.

Specifically, the active coupler has a control terminal for receiving a branch control signal for enabling one of a through branch and a coupling branch of the coupling device to be in a conducting state.

Furthermore, when the through branch of the coupling device is enabled to be in a conducting state, the coupling device is in a through state, and the coupling device is equivalent to a transmission line and directly transmits out a received signal. And when the coupling branch of the enabling coupling device is in a conducting state, the coupling device executes coupling operation and outputs a feedback signal obtained by coupling processing.

The coupling device may include a passive coupler, and since the passive coupler does not have a through state, the passive coupler can only implement coupling operation, and thus, the coupling device may further include a switching device; wherein:

the switch device has two first terminals and a second terminal, wherein one first terminal of the switch device is used for receiving the FBRX signal, the other first terminal of the switch device is connected with the coupled output terminal of the passive coupler, and the second terminal of the switch device is used for outputting the FBRX signal received by any one first terminal.

Specifically, when a first end and a second end of the switching device are connected, the coupling device is in a through state and acts as a transmission line to directly transmit the received signal. When the other first end and the second end of the switch device are conducted, the other first end of the switch device is connected with the passive coupler, and the coupling device executes coupling operation and outputs a feedback signal obtained through coupling processing.

Further, the switching device further includes:

a control interface for receiving a branch control signal for enabling the first and second terminals of the switching device to be in a conducting state

Specifically, the control interface may be a GRFC (general RF control) interface, that is, the voltage of one port Controls the switch direction, for example, the high level is bypass state, and the low level is ON state.

Fig. 8 (c) is an application diagram of path switching according to the embodiment of the present application. As shown in fig. 8 (c), taking the coupling device corresponding to the second coupling branch 32 and the second straight-through branch 52 as an example, the coupling device includes CPL2 and SPDT, wherein a first end of the SPDT is connected to the coupling output end of CPL1, another first end of the SPDT is connected to the coupling output end of CPL2, and a second end of the SPDT is connected to the first input port RFIN1 of the combiner 40. The bypass state is realized by controlling the switching of the SPDT.

Although the SP4T and the SPDT are both switching devices, they are obviously different from each other, the SP4T is an RFFE (radio frequency Front-end) interface device, and the trend of the switch is controlled by a register instruction, so that the hardware cost is high, the occupied area is large, and the power consumption is high. The SPDT device is a General Radio Frequency Control (GRFC) interface device, and controls the switch direction by high and low levels. Compared with SP4T, SPDT is lower in price, smaller in occupied area and lower in power consumption.

Fig. 8 (d) is a schematic diagram of a second application of the radio frequency system according to the embodiment of the present application. As shown in fig. 8 (d), the radio frequency system includes a

radio frequency transceiver

10, 4 transmitting branches, 4 CPLs, and a combiner 40; wherein:

a first transmission port TX1 for transmitting an LB signal, such as a B5 band;

a second transmission port TX2 for transmitting UHB signals, such as N77 band;

a fourth transmit port TX4 for transmitting MB signals, such as B3 signals;

the feedback input port FB is configured to receive a feedback signal corresponding to the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, or the fourth radio frequency signal.

the third transmitting branch 23 includes an MHB PAMID, and is connected to the radio frequency transceiver 10 through a third transmitting port TX3, and configured to process the HB;

the fourth transmitting branch 24 includes an MHB PAMID, and is connected to the rf transceiver 10 through a fourth transmitting port TX4, for processing the MB signal;

4 CPLs, namely a first coupling device 31, a second coupling device 32, a third coupling device 33 and a fourth coupling device 34, respectively, wherein in fig. 8 (d), the first coupling device 31 is CPL1, the second coupling device 32 is CPL2, the third coupling device 33 is CPL3, and the fourth coupling device 34 is CPL4; wherein:

the CPL1 is coupled with the third transmitting branch 23 and is used for acquiring a feedback signal FBRX _1 corresponding to the HB signal;

CPL3, coupled to the fourth transmitting branch 24, and configured to acquire a feedback signal FBRX _3 corresponding to the MB signal;

the CPL2 is coupled with the first transmitting branch 21 and is used for acquiring a feedback signal FBRX _2 corresponding to the LB signal; and the coupling output end of the CPL1 is connected, and the feedback signal FBRX _1 is output;

CPL4, coupled to the second transmitting branch 22, and configured to acquire a feedback signal FBRX _ UHB corresponding to the UHB signal; and the coupling output end of the CPL3 is connected for outputting the feedback signal FBRX _ 4.

A combiner 40 having 2 input ports (RFIN 1, RFIN 2) and 1 combined output port RFOUT, wherein:

RFIN1, connected to CPL2, for receiving feedback signal FBRX _1 and feedback signal FBRX _2;

RFIN2, connected to CPL4, for receiving feedback signal FBRX _3 and feedback signal FBRX _4;

RFOUT for receiving the feedback signals output from the 4 input ports.

In the configuration shown in fig. 8 (d), the transmission of the feedback signals of the 4 transmitting branches is completed by the combiner 40 instead of the SP4T.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

Claims

1. A radio frequency system, comprising:

the combiner comprises a first input port, a second input port and a combining output port, wherein the first input port is connected with the second coupling branch, the fourth coupling branch is connected with the second input port, and the combining output port is connected with the feedback input port.

2. The radio frequency system of claim 1, wherein:

the radio frequency transceiver is also provided with a third transmitting port;

the radio frequency system further comprises:

the third transmitting branch is connected with the third transmitting port and used for processing a third transmitting signal output by the radio frequency transceiver;

the first coupling branch is coupled with the third transmitting branch and used for acquiring a third feedback signal corresponding to the third transmitting signal;

the combiner further includes a third input port, wherein the first coupling branch is connected to the third input port.

3. The radio frequency system of claim 2, wherein:

the radio frequency transceiver is also provided with a fourth transmitting port;

the radio frequency system further comprises:

the fourth transmitting branch is connected with the fourth transmitting port and used for processing a fourth transmitting signal output by the radio frequency transceiver;

the third coupling branch is coupled with the fourth transmitting branch and used for acquiring a fourth feedback signal corresponding to the fourth transmitting signal;

the combiner further includes a fourth input port, and the third coupling branch is connected to the fourth input port.

4. The radio frequency system of claim 1, wherein:

the radio frequency system further comprises:

a second straight-through branch connected with the first coupling branch;

wherein the first input port is switchably connectable to the second through branch and the second coupling branch.

5. The radio frequency system according to claim 4, wherein:

the radio frequency system further comprises:

a fourth straight-through branch connected with the third coupling branch;

wherein the second input port is switchably connectable to the fourth straight-through branch and the fourth coupling branch.

6. The radio frequency system according to claim 5, wherein:

the first transmission signal is a low-frequency LB signal;

the second transmitting signal is an ultrahigh frequency UHB signal;

the third transmitting signal is a high-frequency HB signal;

the fourth transmit signal is an intermediate frequency MB signal.

7. The coupled integrated circuit of claim 6, wherein:

the working frequency of the first coupling branch is less than that of the second coupling branch;

and/or the presence of a gas in the gas,

the working frequency of the third coupling branch is less than that of the fourth coupling branch.

8. The radio frequency system according to any of claims 4 to 7, wherein:

the second straight-through branch and the second coupling branch are integrated in the same coupling device;

and/or;

the fourth straight-through branch and the fourth coupling branch are integrated in the same coupling device.

9. The radio frequency system of claim 8, wherein the coupling device is an active coupler;

the active coupler has a control terminal for receiving a branch control signal for enabling one of a through branch and a coupling branch of the coupling device to be in a conducting state.

10. The radio frequency system of claim 8, wherein the coupling device comprises a passive coupler and a switching device; wherein:

the passive coupler is provided with a coupling output end;

the switch device has two first terminals and a second terminal, wherein one first terminal of the switch device is used for receiving the FBRX signal, the other first terminal of the switch device is connected with the coupled output terminal of the passive coupler, and the second terminal of the switch device is used for outputting the feedback signal received by any one first terminal.

11. The coupled integrated circuit of claim 10, wherein the switching device further comprises:

a control interface for receiving a branch control signal for enabling the first and second terminals of the switching device to be in a conducting state.