CN113726360A

CN113726360A - Radio frequency PA Mid device, radio frequency transceiver and communication equipment

Info

Publication number: CN113726360A
Application number: CN202010457434.XA
Authority: CN
Inventors: 陈武
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2021-11-30
Anticipated expiration: 2040-05-26
Also published as: CN113726360B; WO2021238536A1

Abstract

The application provides a radio frequency PA Mid device, radio frequency transceiver and communications facilities, wherein, radio frequency PA Mid device is configured with transmission port, receiving port and antenna port, and radio frequency PA Mid device includes: the transmitting circuit comprises a power amplifier, a receiving circuit and a transmitting circuit, wherein the power amplifier is used for receiving the radio-frequency signals sent by the radio-frequency transceiver and amplifying the power of the radio-frequency signals; the receiving circuit comprises a low noise amplifier and is used for amplifying the received radio frequency signal; the first control unit is connected with the control end of the low noise amplifier and used for adjusting the gain coefficient of the low noise amplifier so as to reduce the cascade noise coefficient of the receiving link; the switch circuit is used for selectively conducting a receiving link where the receiving circuit is located or a transmitting link where the transmitting circuit is located, so that the noise coefficient of the receiving link used for receiving the radio-frequency signals can be reduced, and the sensitivity of the radio-frequency transceiver can be improved.

Description

Radio frequency PA Mid device, radio frequency transceiver and communication equipment

Technical Field

The present application relates to the field of radio frequency technologies, and in particular, to a radio frequency PA Mid device, a radio frequency transceiver, and a communication apparatus.

Background

With the development and progress of the technology, the 5G mobile communication technology is gradually beginning to be applied to electronic devices. The 5G mobile communication technology communication frequency is higher than that of the 4G mobile communication technology. The PA Mid device is defined in the general 5G architecture design, but when the PA Mid device is applied to a radio frequency transceiver to receive radio frequency signals (for example, radio frequency signals in the N41 frequency band), the sensitivity of a radio frequency system receiving link is low.

Disclosure of Invention

The embodiment of the application provides a radio frequency PA Mid device, a radio frequency transceiver and a communication device, which can improve the sensitivity of the radio frequency transceiver.

A radio frequency PA Mid device configured with a transmit port for connection to a radio frequency transceiver, a receive port for connection to a radio frequency LNA device, and an antenna port for connection to an antenna, the radio frequency PA Mid device comprising:

the transmitting circuit comprises a power amplifier, wherein the input end of the power amplifier is connected with the transmitting port and is used for receiving the radio-frequency signal sent by the radio-frequency transceiver and amplifying the power of the radio-frequency signal;

the receiving circuit comprises a low noise amplifier, and the output end of the low noise amplifier is connected to the receiving port and is used for amplifying the received radio frequency signal;

the first control unit is connected with the control end of the low noise amplifier and used for adjusting the gain coefficient of the low noise amplifier so as to reduce the cascade noise coefficient of the receiving link;

and the switch circuit is respectively connected with the output end of the power amplifier, the input end of the low-noise amplifier and the antenna port and is used for selectively conducting a receiving link where the receiving circuit is located or a transmitting link where the transmitting circuit is located.

A radio frequency transceiving apparatus comprising:

as in the case of the rf PA Mid devices described above,

the antenna is connected with the antenna port and used for receiving and transmitting radio frequency signals;

the radio frequency LNA device is connected with the receiving port and is used for amplifying the radio frequency signal output by the radio frequency PA Mid device;

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

A communication device comprises the radio frequency transceiver.

According to the radio frequency PA Mid device, the radio frequency transceiver and the communication equipment, after the low-noise amplifier is arranged between the switch circuit and the receiving port in the radio frequency PA Mid device, the noise coefficient of a receiving link of the radio frequency transceiver for receiving radio frequency signals can be reduced, and the sensitivity of the radio frequency transceiver can be improved.

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 described 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 creative efforts.

FIG. 1 is a block diagram of an exemplary RF transceiver device;

FIG. 2 is one of the block diagrams of the structure of the RF PA Mid device in one embodiment;

FIG. 3 is a second block diagram of the RF PA Mid device in one embodiment;

fig. 4 is a third block diagram of the structure of an rf PA Mid device in an embodiment;

FIG. 5a is a pin diagram of an RF PA Mid device according to an embodiment;

fig. 5b is a schematic diagram of a package structure of an rf PA Mid device in an embodiment;

FIG. 6 is a second block diagram of the RF transceiver device according to an embodiment;

FIG. 7 is a third block diagram of an exemplary embodiment of an active RF transceiver device;

FIG. 8 is a block diagram of the RF PA Mid device in one embodiment;

fig. 9 is a block diagram of an embodiment of an rf transceiver device.

Detailed Description

In order to make the above 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, however, may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. 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 implicit to indicate a number of technical features being 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 explicitly specified otherwise.

The radio frequency transceiver device according to the embodiment of the present application may be applied to a communication device with 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 devices connected to a wireless modem, and various forms of User Equipment (UE) (e.g., a Mobile phone), a Mobile Station (MS), and so on. 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 rf transceiver 10 in the embodiment of the present invention includes an antenna 100, a Power Amplifier Modules (Power Amplifier Modules) device 200, a radio frequency lna (low Noise Amplifier) device 300, and an rf transceiver 400. In the internal receiving link of the rf PA Mid device 200, a low noise amplifier 231 is added between the receiving port RXOUT and the switch circuit 220, so as to improve the sensitivity of the rf transceiver 10.

Sensitivity refers to the minimum input signal level that the radio frequency transceiver 10 (which may also be used as a receiver) can receive while satisfying a certain bit error rate performance. The communication protocol 3GPP specifies that, when testing the sensitivity index, the Bit Error Rate (BER) is required to be lower than 5%, i.e. the throughput is higher than 95%; under the above conditions, the minimum input level signal measured is the sensitivity of the receiver.

The sensitivity can be calculated by a theoretical formula, and is specifically shown in formula 1:

sensitivity ═ 174+10lgBW + NF (equation 1)

Wherein, BW refers to the Bandwidth (Bandwidth) of the working frequency band of the receiver, and the unit is Hz; NF refers to the Noise Figure (Noise Figure) of the receiver, in dB. According to the formula (1), when the bandwidth BW of the working frequency band and the noise coefficient NF of the receiver are obtained, the sensitivity performance of the receiver can be theoretically calculated.

In addition, since the receiver is composed of a plurality of cascaded devices, the calculation formula of the cascaded noise figure is shown as formula (2):

NF-N1 + (N2-1)/G1+ (N3-1)/G1X G2+ (N4-1)/G1X G2X G3+ … (formula 2)

In the formula, 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, so that the final cascade noise of the whole receiving chain can be calculated by the formula (2). Meanwhile, the cascade noise coefficient is mainly determined by N1, N2 and G1, and particularly N1 is directly added to the noise coefficient of the whole cascade; therefore, reducing N1 is the most effective means of reducing the overall noise figure.

In one embodiment, the rf PA Mid device 200 may perform power amplification on an rf signal in a preset frequency band sent by the rf transceiver 400, and then transmit the rf signal through the antenna 100, and at the same time, may also receive the rf signal in the preset frequency band through the antenna 100, perform low noise amplification on the received rf signal, and then output the rf signal to the rf receiver for processing, so as to implement transceiving control on the rf signal.

As shown in fig. 2, in one embodiment, the rf PA Mid device 200 is configured with a transmitting port RFIN for connecting the rf transceiver 400, an antenna port ANT for connecting the antenna 100, and a receiving port RXOUT for connecting the rf LNA device 300.

Therein, the radio frequency PA Mid device 200 includes a transmitting circuit 210, a switching circuit 220, a receiving circuit 230, and a first control unit 240. The transmitting circuit 210 includes a power amplifier 211, and an input end of the power amplifier 211 is connected to the transmitting port RFIN, and is configured to receive the radio frequency signal sent by the radio frequency transceiver 400 and perform power amplification on the radio frequency signal. For example, the power amplifier 211 may be understood as a radio frequency power amplifier 211, which is capable of performing power amplification processing on a radio frequency signal in a preset frequency band.

The receiving circuit 230 is configured to include a low noise amplifier 231, and the low noise amplifier 231 is connected to the switching circuit 220 and the receiving port RXOUT respectively, and is configured to perform amplification processing on the received radio frequency signal.

The first control unit 240 is connected to the control end of the low noise amplifier 231, and is configured to adjust a gain coefficient of the low noise amplifier 231 to increase a gain of a receiving link where the receiving circuit 230 is located, so as to reduce a cascade noise coefficient of the receiving link.

The switch circuit 220 is connected to the output terminal of the power amplifier 221, the antenna port ANT, and the input terminal of the low noise amplifier 231, respectively, and is configured to selectively turn on a receiving link where the receiving circuit 220 is located or a transmitting link where the transmitting circuit 230 is located. That is, when the switch circuit 220 selects to turn on the path between the power amplifier 221 and the antenna port ANT, the transmit link may be correspondingly turned on to implement the transmit control of the radio frequency signal, and when the switch circuit 220 selects to turn on the path between the low noise amplifier 231 and the antenna port ANT, the receive link may be correspondingly turned on to implement the receive control of the radio frequency signal.

In one embodiment, the rf signal may be a 5G signal, and the frequency band of the 5G signal may be N41 frequency band, N77 frequency band, N78 frequency band, N79 frequency band. Specifically, the working frequency band of N41 is 496MHz-2690MHz, the working frequency band of N77 is 3.3GHz-4.2GHz, the working frequency band of N78 is 3.3GHz-3.8GHz, and the working frequency band of N79 is 4.4 GHz-5.0 GHz. It should be noted that the operating band of N77 covers the operating band of N78. That is, when the rf PA Mid device 200 can support the transceiving of the rf signal in the N77 frequency band, it can also support the transceiving of the rf signal in the N78 frequency band.

Taking the radio frequency signal as a 5G signal of N41 frequency band as an example, when the radio frequency PA Mid device 200 is disposed in the radio frequency transceiver 10, the low noise amplifier 231 is disposed in the receiving link of the radio frequency PA Mid device 200, and the first control unit 240 can adjust the gain coefficient of the low noise amplifier 231, so as to reduce the cascade noise coefficient of the whole receiving link of the radio frequency transceiver 10, and further improve the sensitivity of the radio frequency transceiver 10.

In one embodiment, the switch circuit 220 in the rf PA Mid device 200 may include an rf SPDT switch. Illustratively, one end of the rf SPDT is connected to the antenna port ANT, one end of the rf SPDT is connected to the input end of the power amplifier 211, and one end of the rf SPDT is connected to the output end of the low noise amplifier 231, and is configured to selectively turn on the receiving link where the receiving circuit 230 is located or the transmitting link where the transmitting circuit 210 is located.

In this embodiment, when one end of the rf SPDT switch is controlled to be connected to the output end of the power amplifier 211, the transmission link where the power amplifier 211 is located may be turned on to enable the antenna 100 to transmit the rf signal processed by power amplification; when one end of the rf SPDT switch is controlled to be electrically connected to the input end of the low noise amplifier 231, the receiving link where the low noise amplifier 231 is located is turned on so that the rf transceiver 10 processes the rf signal received by the antenna 100.

Optionally, the switch circuit 220 may also be an electronic switch tube, a Mobile Industry Processor (MIPI) Interface, and/or a General-purpose input/output (GPIO) Interface. The corresponding control unit can be an MIPI control unit and/or a GPIO control unit. Illustratively, when it is required to turn on the receiving link or the transmitting link, the MIPI control unit may output clock and data signals to corresponding pins connected to the power amplifier 211 and the low noise amplifier 231. The GPIO control unit may correspondingly output high level signals to corresponding pins connected to the power amplifier 211 and the low noise amplifier 231.

It should be noted that, in the embodiment of the present application, the specific form of the switch circuit 220 is not further limited.

In one embodiment, the first control unit 240 of the rf PA Mid device 200 is connected to the low noise amplifier 231, and is configured to adjust a gain coefficient of the low noise amplifier 231.

For example, the first Control unit 240 may be a Mobile Industry Processor Interface (MIPI) -RF Front End Control Interface (RFFE) Control unit, and when the first Control unit 240 is the MIPI-RFFE Control unit, the RF PA Mid device 200 is further configured with a CLK input pin of a clock signal, an sdata input or bidirectional pin of a single/bidirectional data signal, a power VDD pin, a reference voltage VIO pin, and the like.

In the present application, the low noise amplifier 231 in the rf PA Mid device 200 is an amplifying device with adjustable gain. The low noise amplifier 231 has 8 gain levels, with specific settings as shown in table 1.

TABLE 1 Low noise Amplifier gain level

Gain level	G7	G6	G5	G4	G3	G2	G1	G0
									Gain value (dB)	17	15	13	11	9	7	5	3

When the gain of the low noise amplifier 231 in the rf PA Mid device 200 is adjustable, the second control unit 250 may adjust the gain level of the low noise amplifier 231 according to the power value of the rf signal received by the antenna 100. Illustratively, when the power value of the radio frequency signal received by the antenna 100 is too high, the gain level of the low noise amplifier 231 may be appropriately lowered. For example, considering the in-band blocking scenario, a large interference signal may cause the in-band blocking, based on the existing data budget, the specific value is shown in table 2, when the interference signal is-44 dBm, the input power of the rf transceiver 400 is-19.3 dBm, which is close to the maximum input power, and at this time, the gain level of the low noise amplifier 231 may be adjusted to avoid the rf signal power from being close to or greater than the maximum input power of the rf transceiver 400, which may cause damage to the rf transceiver 400.

Table 2 receive link congestion budget analysis

As shown in fig. 2, in one embodiment, the rf PA Mid device 200 further includes a second control unit 250. The second control unit 250 is connected to the switch circuit 220 and the power amplifier 211, and is configured to control on/off of the switch circuit 220 and control a working state of the power amplifier 211.

The second control unit 250 is of the same type as the first control unit 240, 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 the switch circuit 220 may be matched with the control logic of the first control unit 240 and the second control unit 250, and in the embodiment of the present application, specific types of the switch circuit 220, the first control unit 240, and the second control unit 250 are not further limited.

As shown in fig. 3, in one embodiment, the rf PA Mid device 200 further includes a first filter 223. The first filter 223 is connected to the control end of the switch circuit 220, and is configured to perform filtering processing on the radio frequency signal. The first filter 223 may filter the rf signal amplified by the power amplifier 211, and the first filter 223 may allow only the rf signal in a predetermined frequency band (e.g., N41 frequency band) to pass through.

In one embodiment, the first filter 223 may be a band pass filter. Wherein the insertion loss of the band-pass filter is about 2.5 dB.

In one embodiment, the rf PA Mid device 200 is configured with a coupling output port CPLOUT, and the rf PA Mid device 200 further includes a coupling unit 241 and a coupling switch 243. The coupling unit 241 is used for coupling the rf signal in the transmission path to enable coupling out the rf signal, and the coupled signal output by the coupling unit can be used for measuring the forward coupling power and the reverse coupling power of the rf signal. Specifically, the coupling unit 241 includes an input terminal a, an output terminal b, a first coupling terminal c, and a second coupling terminal d. Meanwhile, the coupling unit 241 further includes a main line extending between the input terminal a and the output terminal b, and a sub line extending between the first coupling terminal c and the second coupling.

An input end a of the coupling unit 241 is connected to the first filter 223, an output end b of the coupling unit 341 is connected to the antenna port ANT, and a first coupling end c is configured to couple the radio frequency signal received by the input end a and output a forward coupling signal; and the second coupling end d is used for coupling the reflected signal of the radio-frequency signal received by the output end b and outputting a reverse coupling signal. Based on the forward coupling signal output by the first coupling end c, the forward power information of the radio frequency signal can be detected; based on the reverse coupling signal outputted from the second coupling terminal d, the reverse power information of the rf signal can be correspondingly detected, and the detection mode is defined as a reverse power detection mode.

The coupling switch 243 is respectively connected to the first coupling end c, the second coupling end d, and the coupling output port CPLOUT, and is configured to selectively conduct a first coupling path between the first coupling end c and the coupling output port CPLOUT to implement detection of forward power of the radio frequency signal, and define the detection mode as a reverse power detection mode, or conduct a second coupling path between the second coupling end d and the coupling output port CPLOUT to implement detection of reverse power of the radio frequency signal, and define the detection mode as a reverse power detection mode. That is, the coupling switch 243 is used to switch between a forward power detection mode and a reverse power detection mode. Specifically, the coupling unit 341 includes two directional couplers connected in series in an opposite direction.

In this embodiment, the rf PA Mid device 200 is only provided with one coupling output port CPLOUT, and since the rf signals of multiple frequency bands are not transmitted simultaneously, one coupling output port CPLOUT can also meet the communication requirement, and also reduce the complexity of rf routing inside the rf PA Mid device 30, and at the same time, improve the isolation performance of each routing of the rf PA Mid device 30.

As shown in fig. 4, in one embodiment, the rf PA Mid device 200 is configured with a coupling output port CPLIN, and the rf PA Mid device 200 further includes: a switch 245 connected to the coupling switch 243, the coupling input port CPLIN, and the coupling output port CPLOUT, respectively; the first coupling channel for selectively conducting the coupling unit 241 to output the coupling signal and the second coupling channel for conducting the external coupling signal.

In the embodiment of the present application, a coupling input port CPLIN is configured in the radio frequency PA Mid device 200, so that coupling signals output by other radio frequency PA Mid devices can be input through the coupling input port CPLIN and then output through the coupling output port CPLOUT, the radio frequency routing length of coupling transmission of other radio frequency PA Mid devices can be shortened, the complexity of the layout of the radio frequency transceiver 10 is reduced, meanwhile, the area of the PCB occupied by the radio frequency transceiver 10 is also reduced, and the cost is reduced.

In one embodiment, the rf PA Mid device 200 includes a switch circuit 220, a first filter 223, a low noise amplifier 231, and an rf trace, and the signal flow of its receiving link is: a radio frequency signal enters from the antenna port ANT, passes through the first filter 223, the switch circuit 221, and the low noise amplifier 231, and then reaches the receiving port RXOUT. The signal flow direction of the transmitting link is as follows: the radio frequency signal enters from the receiving port RFIN port, the power amplifier 211, the switching circuit 221, the first filter 223, and then reaches the antenna port ANT.

The switching circuit 221 is an rf SPDT switch, and the first filter 223 is a band pass filter. The RF SPDT switch may be referenced to switch RF1630 and the bandpass filter may be referenced to the SAFFB2G59AA1F0A device, with specific insertion loss values as shown in the table of fig. 3.

TABLE 3 insertion loss of internal receiving link of RF PA Mid device

In one embodiment, in the rf PA Mid device 200, the total insertion loss of the rf trace connecting two adjacent devices can be recorded as 0.5 dB.

In the embodiment of the present application, each device in the rf PA Mid device 200 may be integrally packaged in the same package module. That is, the transmitting circuit 210, the switching circuit 220, the receiving circuit 230, the first filter 223, the first control unit 240, and the second control unit 250 are all integrated and packaged in the same module to form a packaged chip.

Specifically, the packaged chip may be configured with a plurality of pins, for example, as shown in fig. 5a, the plurality of pins may include an antenna port pin, a transmitting port pin, a receiving port pin, a ground pin, a reset enable input pin, an RFFE bus clock input pin, an RFFE bus data input/output pin, a coupling output pin, and the like. The antenna port pin corresponds to an antenna port ANT, the transmission port pin corresponds to a transmission port RFIN, the reception port pin corresponds to a reception port RXOUT, and the like.

The package specification of the packaged chip, the rf PA Mid device 200, is shown in fig. 5 b. The number of pins of the packaged chip can reach 30, the length of the packaged chip in the first direction is 5 mm, the width of the packaged chip in the second direction is 3 mm, the distance between every two adjacent pins is 0.4 mm, and the width and the length of each pin are 0.25 mm and 0.2 mm respectively.

In the embodiment of the present application, each device in the rf PA Mid device 200 is packaged in the same chip, which can improve the integration level, reduce the space occupied by each device, and facilitate the miniaturization of the device.

In this embodiment, a low noise amplifier 231 may be added to the rf PA Mid device 200 in the rf transceiver device 10, and when the switch circuit 220 in the rf PA Mid device 200 switches on the receiving link where the receiving circuit 230 is located, the flow direction of the rf signal received by the rf transceiver device 10 is as follows:

the signal flow of the receiving chain is as follows: the radio frequency signal enters through the antenna 100, and flows to the antenna port ANT of the radio frequency PA Mid device 200 through the radio frequency wiring; the radio frequency signal is switched from the first filter 223 to the switch circuit 220, to the receiving circuit 230, and then to the receiving port RXOUT through the low noise amplifier 231; the rf signal is routed from the rf PA Mid device 200 to the rf LNA device 300 via rf cabling; and enters from the MHB2 port of the rf LNA device 300, and is output to the rf transceiver 400 through the output port of the rf LNA device 300.

In combination with the sensitivity calculation formula (2), when the bandwidth of the operating band is determined, the noise figure of the receiving link of the radio frequency transceiver 10 directly affects the sensitivity index of the radio frequency transceiver 10. In the present application, the level of the noise figure of the receiving link of the rf transceiver 10 has six levels, which are respectively as follows:

a first grade: passive loss of the link between the antenna 100 to the antenna port ANT of the rf PA Mid device 200. Exemplary passive loss can include loss of passive devices such as a filter unit and a radio frequency switch and loss of routing, and the passive loss of a link between the antenna 100 and the antenna port ANT of the radio frequency PA Mid device 200 at a frequency band of 2.49-2.69 GHz (N41) is 2.55-2.8 dB.

A second stage: the insertion loss of the internal receive chain of the rf PA Mid device 200.

Third level: the insertion loss of the routing connected between the radio frequency PA Mid device 200 and the radio frequency LNA device 300 is about 2.5 dB;

fourth level: the noise figure of the internal receive chain of the rf LNA device 300 is 1.2dB as shown in table 4.

TABLE 4 RF LNA device internal low noise amplifier parameter information

Device with a metal layer	Gain (dB)	Noise figure (dB)
			Index (I)	17	1.2

And a fifth grade: the insertion loss of the wires connected between the rf LNA device 300 and the rf transceiver 400 is about 1 dB;

and a sixth grade: the noise figure of the radio frequency transceiver 400 is 10 dB.

Compared with the receiving chain of the conventional radio frequency transceiver 10, in the embodiment of the present application, the low noise amplifier 231 is disposed in the switch circuit 221 and the receiving port RXOUT in the radio frequency PA Mid device 200. According to the noise coefficient cascade formula (2), the cascade noise coefficients of the receiving chains of the conventional rf transceiver 400 and the rf transceiver 400 of the present application can be calculated and obtained.

The traditional scheme is as follows:

the scheme of the application is as follows:

it should be noted that, when calculating the cascade noise coefficient, the passive loss of the passive device is the noise coefficient thereof, and the loss of the radio frequency routing is the noise coefficient thereof. Wherein L is_{Passive loss}Indicating insertion loss, L, from antenna 100 to RF PA Mid device 200_{Insertion loss 1 of radio frequency PA Mid device}Represents the insertion loss of the rf PA Mid device 200 (the switch circuit 221+ the first filter 223); l is_{Radio frequency routing 1 loss}Represents the loss of the rf trace 1 between the rf PA Mid device 200 and the rf LNA device 300, N_{Radio frequency LNA device}Represents the low noise figure of the rf LNA device 300; n is a radical of_{Radio frequency routing 2+ radio frequency transceiver}Represents the loss of the RF trace 2 and the RF transceiver 400 between the RF transceiver 400 and the RF LNA device 300And (4) consuming.

In the formula, the cascade noise coefficient of the receiving link in the conventional scheme is the same as the first two terms in the cascade noise coefficient formula of the receiving link in this embodiment, where the first term of the cascade formula may be understood as the insertion loss from the antenna 100 to the rf PA Mid device 200, and the second term of the cascade formula may be understood as the insertion loss of the switch, the filter, and the rf trace in the rf PA Mid device 200. In the third term of the cascade formula, the loss value of the rf trace 1 is directly superimposed in the formula of the conventional scheme, which is as high as 2.5dB, while the noise coefficient of the low noise amplifier 231 in the rf PA Mid device 200 is increased to 1.2dB in this embodiment; the fourth term of the cascade formula, in the formula of the conventional scheme, the noise coefficient of the radio frequency LNA device 300 is directly superposed to be 1.2 dB; while in the embodiment is added

About 0 dB; in the fifth term and the sixth term of the cascade formula, the noise introduced by the conventional scheme is 0.1dB, and the noise introduced by the present application is 0.4dB and 0.2dB, wherein the introduced noise coefficient is larger than that of the conventional scheme because the gain of the radio frequency trace 1 of the present application is-2.5 dB.

Through the calculation and analysis of the above cascade equation, the following conclusions can be drawn: the noise coefficient in the receiving link of the radio frequency transceiver 10 is mainly determined by the first four terms of the cascade equation, and when the low noise amplifier 231 is disposed between the switch circuit 220 and the receiving port RXOUT in the radio frequency PA Mid device 200, the noise coefficient of the radio frequency transceiver 10 is reduced, so that the noise coefficient of the receiving link of the radio frequency transceiver 10 is reduced by 2 dB.

The performance index of 5G NR radio frequency transceiver in the industry is referred to the Talle protocol, and the performance index requirements of 5G NR N41, N78 and N79 sensitivity are shown in Table 5.

TABLE 5 Tyler protocol sensitivity index requirements

Based on the conventional technical solution, when the low noise amplifier 231 is not introduced into the rf PA Mid device 200, the sensitivity index of 5G NR N41 may be tested, and specific test data is shown in table 6.

TABLE 65G NR N41 sensitivity test data

Therefore, the sensitivity performance of 5G NR N41 is not up to standard in the traditional scheme.

In the embodiment of the present application, when the low noise amplifier 231 is disposed between the switch circuit 221 and the receiving port RXOUT in the rf PA Mid device 200, the noise figure of the rf transceiver 10 is reduced. Budget analysis is performed on a receiving link of the radio frequency transceiver device 10 provided by the present application, and as shown in table 7, the obtained sensitivity theoretical value is-85.9 dBm/100 MHz; compared with the original scheme of-83.9 dBm/100MHz, the performance is improved by 2 dB.

Table 7 receiving link sensitivity budget of rf transceiver device of the present application

In the embodiment of the present application, starting from the architecture inside the rf PA Mid device 200, the low noise amplifier 231 is added to the receiving link of the switch circuit 220 of the rf PA Mid device 200, so as to reduce the cascade noise coefficient of the receiving link by increasing the gain of the receiving link, thereby improving the sensitivity of the rf transceiver 10.

Currently, two networking methods are adopted in a 5G network: independent networking (standalon, SA) and Non-independent Networking (NSA). The two have different requirements on technical requirements and implementation manners, and for example, in the NSA mode, the following technical conditions need to be satisfied:

first, Long Term Evolution (LTE) and 5G New air interface (New Radio, NR) communicate based on a dual connection mode, that is, an LTE frequency band and an NR frequency band can work simultaneously.

Here, when LTE is operating independently, it may also support dual antenna 100 or multi-antenna 100 handover and the capability of 4 × 4MIMO supporting downlink reception. The MIMO technology is a core technology that uses a plurality of transmitting antennas 100 and receiving antennas 100 at a transmitting port RFIN and a receiving port RXOUT, respectively, makes full use of space resources, realizes multiple transmission and multiple reception through the plurality of antennas 100, can improve system channel capacity by multiple times without increasing spectrum resources and transmitting power of the antennas 100, shows obvious advantages, and is considered as next-generation mobile communication.

The communication and base stations may form 2 × 2MIMO or 4 × 4MIMO, and the configuration of the receive path antenna port ANT is shown in table 8, taking 4 × 4MIMO as an example.

Table 8 receive antenna port ANT configuration

It should be noted that, when the talr protocol tests the receiving performance, all 4 receiving links are also connected to the meter. The 4 channels form the downlink of MIMO, all receive the signals sent by the uplink base station, and the performance of the receiver is improved.

Secondly, the 5G NR frequency band needs to support 1 transmitting and 4 receiving (1T4R) channel Sounding Reference Signal (SRS) antenna 100 alternate transmission technology.

As shown in fig. 6, in one embodiment, the rf transceiver device 10 includes an antenna 200, an rf PA Mid device 200, an rf LNA device 300, and an rf transceiver 400.

In one embodiment, the antenna 100 is connected to an antenna port ANT of the rf PA Mid device 200 for receiving and transmitting rf signals. The antenna 100 may be an antenna 100 capable of supporting a 5G NR frequency band. Illustratively, antenna 100 may be formed using any suitable type of antenna. For example, antenna 100 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. There may be multiple antennas 100 in the radio frequency transceiver 10. For example, multiple 5G antennas 100 may be included. These antennas 100 may be directional antennas, non-directional antennas, and the like. In the embodiment of the present application, the type of the antenna 100 is not further limited.

And the low-amplification module radio frequency LNA device 300 is connected with the receiving port RXOUT and used for amplifying the radio frequency signal output by the power amplifier front end module radio frequency PA Mid device 200. The low-frequency amplifier module rf LNA device 300 may include a plurality of low-noise amplifiers (not shown) capable of amplifying rf signals of different frequency bands. The rf LNA device 300 at least includes a low noise amplifier capable of performing low noise amplification processing on an rf signal in the N41 frequency band.

The radio frequency transceiver 400 is connected to the low-frequency amplifier module rf LNA device 300 and the transmit port RFIN, and configured to send the radio frequency signal to the power amplifier front-end module rf PA Mid device 200 and receive the radio frequency signal amplified by the rf LNA device 300. Illustratively, the radio frequency transceiver 400 may include a transmitter (such as the transmitter TX) and a receiver (such as the receiver RX), or may include only the receiver (e.g., the receiver RX) or only the transmitter (e.g., the transmitter TX). For example, the radio frequency transceiver 400 may be used to implement frequency conversion processing between an intermediate frequency signal and a baseband signal, and/or to implement frequency conversion processing between an intermediate frequency signal and a high frequency signal, and so on.

In one embodiment, the number of the rf PA Mid devices 200 is two, which are respectively the first rf PA Mid device 210 and the second rf PA Mid device 220; the number of the radio frequency LNA devices is two, and the two radio frequency LNA devices are respectively a first radio frequency LNA device 310 and a second radio frequency LNA device 300; the number of the antennas is four, namely a first antenna Ant0, a second antenna Ant1, a third antenna Ant2 and a fourth antenna Ant 3; the radio frequency transceiver 10 further includes a first switch module 510 and a second switch module 520.

The first rf PA Mid device 210 is respectively connected to the rf transceiver 400, the first rf LNA device 310, and the first end of the first switch module 510, the second end of the first switch module 510 is respectively connected to the first ends of the first antenna Ant0, the second antenna Ant1, and the second switch module 520, and the first end of the first switch module 510 is further connected to the second rf LNA device 300; the second rf PA Mid device 220 is respectively connected to the rf transceiver 400, the second rf LNA device 300, and the first end of the second switch module 520, the third antenna Ant2 and the fourth antenna Ant3 are respectively connected to the second end of the second switch module 520, and the first end of the second switch module 520 is further connected to the second rf LNA device 300.

In one embodiment, the first switch module 510 and the second switch module 520 may each employ a multi-way switch, such as a 3P3T switch, an electronic switch group composed of a plurality of electronic switch tubes, or the like.

The first switch module 510 and the second switch module 520 are exemplified by 3P3T switches. The first switch module 510 includes three first terminals and three second terminals. Illustratively, a first terminal of the first switch module 510 is connected to the first rf PA Mid device 210, another first terminal of the first switch module 510 is connected to the second rf LNA device 300, a second terminal of the first switch module 510 is connected to the first antenna Ant0, a second terminal of the first switch module 510 is connected to a first terminal of the second switch module 520, and a second terminal of the first switch module 510 is connected to the second antenna Ant 1.

A first end of the second switch module 520 is connected to the first rf PA Mid device 210, a first end of the second switch module 520 is connected to the second rf PA Mid device 220, a second end of the second switch module 520 is connected to the third antenna Ant2, and a second end of the second switch module 520 is connected to the fourth antenna Ant 3.

In the embodiment of the present application, the specific types of the first switch module 510 and the second switch module 520 are not further limited.

In the embodiment of the present application, the first switch module 510 and the second switch module 520 may be controlled to selectively switch different receiving chains and transmitting chains of the radio frequency transceiver 10 so that the four antennas 100 receive radio frequency signals simultaneously, and simultaneously, one transmitting chain can be controlled to transmit radio frequency signals. Alternatively, the first switch module 510 and the second switch module 520 may be controlled to selectively switch different receiving chains and transmitting chains of the radio frequency transceiver 10 so that the four antennas 100 receive radio frequency signals simultaneously, and control two transmitting chains to transmit radio frequency signals simultaneously. Or, by controlling the first switch module 510 and the second switch module 520, different transmission links of the radio frequency transceiver 10 are selectively switched, so that the four antennas 100 sequentially transmit radio frequency signals to support a function of transmitting a 4-port SRS between the transmission antennas 100 by sounding reference signals SRS in turn, and also support a function of receiving data by the 4 antennas 100 at the same time.

Table 9 transmit-receive link detailed path configuration table

In table 9, TXO & PRX denotes a main transmission link and a main set reception link, DRX denotes a diversity reception link, TX1& MIMO PRX denotes an auxiliary transmission link and a MIMO main set reception link, and MIMO DRX denotes a MIMO diversity reception link.

Table 10 transmit link path configuration table

	N41
		Channel0	Route 1->Route 5
Channel1	Route 1->Path 7
		Channel2	Route 1->Path 6->Route 8
Channel3	Route 1->Path 6->Path 9

In table 9, Channel0, Channel1, Channel2, and Channel3 are transmission chains of antenna 100, respectively.

The radio frequency transceiver 10 in the embodiment of the present application may implement a function of supporting, in an FDD system, that the communication device transmits the SRS with 4 ports alternately between the transmitting antennas 100 through the SRS, and may also support a function of receiving data simultaneously by the 4 antennas 100.

As shown in fig. 7, in one embodiment, the radio frequency transceiver 10 further includes: a first filtering unit 610 and a second filtering unit 620. The first filtering unit 610 is respectively connected to the antenna port ANT of the first rf PA Mid device 210 and the first end of the first switch module 510, and configured to perform filtering processing on the rf signal received by the first antenna ANT 0; a second filtering unit 620, connected to the antenna port ANT of the second rf PA Mid device 220 and the first end of the second switch module 520 respectively, for filtering the rf signal received by the second antenna ANT 1.

Specifically, the first filtering unit 610 and the second filtering unit 620 are both low-pass filters, and are configured to filter stray waves, which allow radio frequency signals in a preset frequency band to pass through, so as to improve the accuracy of the radio frequency signals received by the radio frequency transceiver 400, and further improve the performance of the radio frequency transceiver 10.

In one embodiment, the radio frequency transceiver 10 further includes a third filtering unit 630 and a fourth filtering unit 640. A third filtering unit 630, which is respectively connected to the second rf-LNA device 300 and the first end of the first switch module 510, and configured to perform filtering processing on the rf signal received by the third antenna Ant 2; the fourth filtering unit 640 is respectively connected to the second rf-LNA device 300 and the first end of the second switch module 520, and is configured to filter the rf signal received by the fourth antenna Ant 3.

Specifically, the third filtering unit 630 and the fourth filtering unit 640 are both low-pass filters for filtering out stray waves, which allow radio frequency signals in a preset frequency band to pass through, so as to improve the accuracy of the radio frequency signals received by the radio frequency transceiver 400, and further improve the performance of the radio frequency transceiver 10.

Referring to fig. 7, for example, taking the PRX receiving chain as an example, the flow direction of the radio frequency signal can be understood as: the rf signal enters through the first antenna Ant0 and flows to the 3P3T switch via path 5; after switching to path 1, the rf signal flows through the first filtering unit 610 to the antenna port ANT of the rf PA Mid device 200; the radio frequency signal is switched to the receiving circuit 210 through the first filter 223 to the switching circuit 220, and is switched to the receiving port RXOUT through the low noise amplifier 231; the rf signal flows from the receiving port RXOUT to the MHB2 port of the rf LNA device 300 through the rf trace 1, enters through the MHB2 port, flows through the UT1 port of the rf LNA device 300, and flows through the rf trace 2 to the rf transceiver 400. The theoretical calculation data in table 7 are combined to obtain the sensitivity index of RX four-channel combination shown in table 11. In table 7, the insertion loss from the antenna 100 to the rf PA Mid device 200 can be understood as the passive loss of the antenna 100 socket, the first filtering unit 610, the first switch module 510, and the rf trace between adjacent devices.

TABLE 11 sensitivity test data for 5G NR N41 of the present application

Compared with the data in table 5, the sensitivity index of the four-channel combiner is improved by 2dB as a whole, and the problem of poor RX sensitivity can be solved through the test case of the tel protocol.

In one of the embodiments, the first filter 223 in the rf PA Mid device 200 in the previous embodiments may be advanced from the back end of the switching circuit 220 into the receiving circuit 230 and the transmitting circuit 210. Specifically, as shown in fig. 8, the transmitting circuit 210 further includes a second filter 213, which is respectively connected to the output terminal of the power amplifier 211 and the switch circuit 220; the receiving circuit 230 further includes a third filter 233, which is respectively connected to the output terminal of the low noise amplifier 231 and the receiving port RXOUT. And the second filter 213 is connected to the output end of the power amplifier 211, and is configured to perform filtering processing on the radio frequency signal.

The third filter 233 is connected to the output end of the low noise amplifier 231, and is configured to filter the radio frequency signal amplified by the power amplifier 211, and the second filter 213 and the third filter 233 only allow the radio frequency signal in a preset frequency band (for example, an N41 frequency band) to pass through.

In one embodiment, the second filter 213 and the third filter 233 may be band pass filters. Wherein the insertion loss of the band-pass filter is about 2.5 dB.

As shown in fig. 9, the rf transceiver 9 includes an rf PA Mid device 200 shown in fig. 8. The radio frequency transceiver 10 shown in fig. 9 may also support a function of transmitting a 4-port SRS between the transmission antennas 100 in turn by using the sounding reference signal SRS, and may also support a function of receiving data by the 4 antennas 100 at the same time.

Taking the PRX receiving chain as an example, the flow direction of the rf signal can be understood as: the radio frequency signal enters through a first antenna ANT0 and flows to the 3P3T switch via path 5; after switching to path 1, the rf signal flows through the first filtering unit 610 to the antenna port ANT of the rf PA Mid device 200; the radio frequency signal is switched to the receiving circuit 220 through the switch circuit 220, and then to the receiving port RXOUT through the low noise amplifier 231 and the first filter 233; the rf signal flows from the receiving port RXOUT to the MHB2 port of the rf LNA device 300 through the rf trace 1, enters through the MHB2 port, flows through the rf LNA device 300 for output, and flows through the rf trace 2 to the rf transceiver 400.

According to the noise coefficient cascade formula (2), the cascade noise coefficient of the receiving link in the radio frequency transceiver 10 in this embodiment may be obtained correspondingly:

in the formula, the cascade noise figure of the receiving link in the conventional scheme is the same as the first term in the cascade noise figure formula of the receiving link in the present embodiment, where the first term of the cascade formula can be understood as the insertion loss from the antenna 100 to the rf PA Mid device 200, and the second term of the cascade formula directly superimposes the insertion loss inside the rf PA Mid device by 3.5dB, while the insertion loss of the switch circuit 220 of the N41 rf PA Mid device 200 in the present embodiment is increased by 0.5 dB. In the third term of the cascade formula, the loss value of the rf trace 1 is directly superimposed in the formula of the conventional scheme, which is as high as 2.5dB, while the noise coefficient of the low noise amplifier 231 in the rf PA Mid device 200 is increased to 1.2dB in this example; the fourth term of the cascade formula, in the formula of the conventional scheme, the noise coefficient of the rf LNA device 300 is directly superimposed to 1.2 dB; and in the embodiment add

About 0.1 dB; in the fifth term and the sixth term of the cascade equation, the noise introduced by the conventional scheme is 0.1dB, and the noise introduced by the present application is 1.4dB, wherein, in this embodiment, the gain of the second filter 213 is-2.5 dB, and the gain of the radio frequency line 1 is-2.5 dB lower, which makes the introduced noise coefficient larger than that of the conventional scheme.

Through the calculation and analysis of the above cascade equation, the following conclusions can be drawn: the noise coefficient in the receiving link of the radio frequency transceiver 10 is mainly determined by the first four terms of the cascade equation, and when the low noise amplifier 231 is disposed in the receiving circuit 230 of the radio frequency PA Mid device 200 and the second filter 213 and the third filter 233 are respectively disposed in the transmitting circuit 210 and the receiving circuit 230, the noise coefficient of the radio frequency transceiver 10 is reduced, so that the noise coefficient of the receiving link of the radio frequency transceiver 10 is reduced by 3.8 dB.

Based on the data of the rf PA Mid device 200 and the respective cascaded portions provided in this embodiment, sensitivity budget analysis can be performed on the receiving link of the rf transceiver 10 provided in this embodiment, as shown in table 12, the obtained theoretical sensitivity value is-87.7 dBm/100MHz, and compared with-83.9 dBm/100MHz in the conventional scheme, the performance is improved by 3.8 dB.

Table 12 radio frequency transceiver device 10 receive link budget

Based on the DRX and DRX MIMO test data in table 7, the sensitivity index of the RX four-channel combiner shown in table 13 is obtained in combination with the theoretically calculated PRX and PRX MIMO data.

TABLE 13 extended protocol 5G NR N41 sensitivity test data

Compared with the data in table 7, the sensitivity index of the four-channel combiner is improved by 4dB as a whole, and the data comparison and analysis can obtain that the radio frequency PA Mid device 200 provided by the embodiment can greatly improve the sensitivity index.

In this embodiment, the third filter 233 may be disposed at the input end of the low noise amplifier 231, or may be disposed at the output end of the low noise amplifier 231. When the third filter 233 is disposed at the output end of the low noise amplifier 231, the nonlinear stray waves generated by the low noise amplifier 231, such as the second harmonic and the third harmonic, can be effectively filtered, and thus the performance of the rf transceiver 10 can be effectively improved.

The embodiment of the application further provides a communication device, the communication device is provided with the radio frequency transceiver device 10 in any one of the above embodiments, and by arranging the radio frequency transceiver device 10 on the communication device, the sensitivity of the communication device for receiving radio frequency signals can be improved, so that the wireless communication performance of the communication device is improved.

The above-mentioned embodiments 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 shall be subject to the appended claims.

Claims

1. A radio frequency PA Mid device configured with a transmit port for connection to a radio frequency transceiver, a receive port for connection to a radio frequency LNA device, and an antenna port for connection to an antenna, the radio frequency PA Mid device comprising:

2. The rf PA Mid device according to claim 1, further comprising:

and the first filter is respectively connected with the switch circuit and the antenna port and is used for filtering the received radio frequency signal.

3. The radio frequency (PA Mid) device according to claim 1, wherein the transmit circuit further comprises:

the second filter is respectively connected with the output end of the power amplifier and the first end of the switch circuit and is used for filtering the radio-frequency signal transmitted by the transmitting link;

the receiving circuit further includes:

and the third filter is respectively connected with the output end and the receiving port of the low noise amplifier and is used for filtering the radio frequency signal transmitted by the receiving link and outputting the radio frequency signal after filtering through the receiving port.

4. The radio frequency PA Mid device according to claim 1, wherein the radio frequency PA Mid device is configured with a coupled output port, the radio frequency PA Mid device further comprising:

the coupling unit comprises an input end, an output end, a first coupling end and a second coupling end, wherein the input end is connected with the second end of the switch circuit, and the output end is connected with the antenna port and is used for coupling the radio frequency signal to output a forward coupling signal and a backward coupling signal;

and the coupling switch is respectively connected with the first coupling end, the second coupling end and the coupling output end and is used for selectively outputting the forward coupling signal or the backward coupling signal.

5. The RF PA Mid device of claim 4, wherein the RF PA Mid device is configured with a coupling input port for receiving an externally coupled signal, the RF PA Mid device further comprising:

the selector switch is respectively connected with the coupling switch, the coupling input port and the coupling input port; the first coupling channel is used for conducting the coupling signal and the second coupling channel is used for conducting the external coupling signal.

6. The radio frequency PA Mid device of claim 2, wherein the first filter is a band pass filter.

7. The radio frequency PA Mid device of claim 3, wherein the second filter and the third filter are both bandpass filters.

8. The rf PA Mid device according to claim 1, further comprising:

and the second control unit is respectively connected with the switch circuit and the power amplifier and is used for controlling the on-off state of the switch circuit and controlling the working state of the power amplifier.

9. The radio frequency PA Mid device according to any of claims 1-8, wherein the transmit circuit, the switch circuit, and the receive circuit are integrated in the same packaged chip.

10. A radio frequency transceiver device, comprising:

the radio frequency PA Mid device according to any of claims 1-9,

the radio frequency LNA device is connected with the receiving port and used for amplifying the radio frequency signal output by the radio frequency PA Mid device;

11. The radio frequency transceiver according to claim 10, wherein the number of the radio frequency PA Mid devices is two, which are a first radio frequency PA Mid device and a second radio frequency PA Mid device respectively; the number of the radio frequency LNA devices is two, and the two radio frequency LNA devices are respectively a first radio frequency LNA device and a second radio frequency LNA device; the number of the antennas is four, and the antennas are respectively a first antenna, a second antenna, a third antenna and a fourth antenna; the radio frequency transceiver device further comprises a first switch module and a second switch module, wherein,

the first radio frequency PA Mid device is respectively connected with a radio frequency transceiver, a first radio frequency LNA device and a first end of a first switch module, a second end of the first switch module is respectively connected with a first antenna, a second antenna and a first end of a second switch module, and the first end of the first switch module is also connected with the second radio frequency LNA device;

the second radio frequency PA Mid device is respectively connected with a radio frequency transceiver, a second radio frequency LNA device and a first end of a second switch module, the third antenna and the fourth antenna are respectively connected with a second end of the second switch module, and the first end of the second switch module is also connected with the second radio frequency LNA device to support functions of 1T4R and 2T4R of the four antennas.

12. The radio frequency transceiver device of claim 11, further comprising:

the first filtering unit is respectively connected with the antenna port of the first radio frequency PA Mid device and the first end of the first switch module and is used for filtering radio frequency signals received by the first antenna;

and the second filtering unit is respectively connected with the antenna port of the second radio frequency PA Mid device and the first end of the second switch module and is used for filtering the radio frequency signal received by the third antenna.

13. The radio frequency transceiver device of claim 12, further comprising:

the third filtering unit is respectively connected with the first radio frequency LNA device and the first end of the first switch module and is used for filtering the radio frequency signal received by the second antenna;

and the fourth filtering unit is respectively connected with the second radio frequency LNA device and the first end of the second switch module and is used for filtering the radio frequency signal received by the fourth antenna.

14. The radio frequency transceiver according to claim 12, wherein the first filtering unit and the second filtering unit each include a low pass filter.

15. The radio frequency transceiver according to claim 13, wherein the third filtering unit and the fourth filtering unit each include a low pass filter.

16. A communication device comprising a radio frequency transceiver device as claimed in any one of claims 10-15.