Transceiving circuit and transceiving system based on GaN power amplifier

Abstract

The utility model relates to a transmitting and receiving circuit and a transmitting and receiving system based on a GaN power amplifier. The transmitting and receiving circuit comprises a main control unit, a transceiver, a transmitting unit, a receiving unit, a switching unit and a load detection unit, the transmitting unit is connected with the transceiver and is used for amplifying a transmitting signal generated by the transceiver and then outputting the transmitting signal to the antenna port; the receiving unit is used for receiving a receiving signal accessed from the antenna port, processing the receiving signal and transmitting the processed receiving signal to the transceiver when the receiving unit is communicated with the transmitting unit; the load detection unit is used for carrying out reflection power detection and outputting a reverse detection signal when the load detection unit is connected with the transmitting unit, so as to control the on-off of the transmitting unit through the reverse detection signal. According to the utility model, the influence of standing wave signals on the receiving pre-stage circuit can be avoided, the reduction of receiving sensitivity caused by insertion loss of the coupling circuit can be avoided, and the isolation degree can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless transceiver systems, and more specifically, to a transceiver circuit and a transceiver system based on a GaN power amplifier. Background Art

[0002] Existing 5.8G transceiver systems usually use SPD (Single-Pole Double-Throw) switches to achieve transceiver operations. For high-power transmission systems based on gallium nitride (GaN) power amplifiers, GaN SPDT switches with higher power handling capabilities or circulators with transceiver isolation functions are usually used to implement the transceiver switching system. Due to the reflection signal isolation function of the circulator, better protection can be provided for the GaN power amplifier. However, when transmitting signals, due to deteriorated port standing waves or low transceiver isolation of the circulator, the input power of the pre-receiver circuit exceeds the maximum power handling capacity, or even causes damage. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a transceiver circuit and a transceiver system based on a GaN power amplifier in view of the problems existing in the prior art.

[0004] The technical solution adopted by the utility model to solve its technical problems is to construct a transceiver circuit based on a GaN power amplifier, including: a main control unit, a transceiver, a transmitting unit, a receiving unit, a switching unit, and a load detection unit;

[0005] The switching unit is respectively connected to the transmitting unit, the receiving unit, the load detection unit, and the main control unit, and is used to connect the transmitting unit and the receiving unit or connect the transmitting unit and the load detection unit according to the switching signal output by the main control unit;

[0006] The transmitting unit is connected to the transceiver, and is used to amplify the transmission signal generated by the transceiver and output it to the antenna port;

[0007] The receiving unit is used to receive the received signal accessed from the antenna port and process the received signal and then transmit it to the transceiver when connected to the transmitting unit;

[0008] The load detection unit is used to detect the reflected power and output a reverse detection signal when connected to the transmitting unit, so as to control the on / off of the transmitting unit through the reverse detection signal.

[0009] In the transceiver circuit based on a GaN power amplifier of the utility model, the transmitting unit includes: a pre-amplifier, a first band-pass filter, a GaN power amplifier circuit, and a circulator;

[0010] The input end of the preamplifier is connected to the output end of the transceiver, the output end of the preamplifier is connected to the input end of the first band-pass filter, the output end of the first band-pass filter is connected to the input end of the GaN power amplifier circuit, the output end of the GaN power amplifier circuit is connected to the first end of the circulator, the second end of the circulator is connected to the antenna port, and the third end of the circulator is connected to the switching unit;

[0011] The preamplifier is used to perform pre-amplification processing on the transmission signal;

[0012] The GaN power amplifier circuit is used to perform power amplification on the transmission signal that has been pre-amplified by the preamplifier, and then transmit it from the first end of the circulator to the second end and output it to the antenna port.

[0013] In the transceiver circuit based on GaN power amplifier of the present invention, the switching unit includes: an SPDT switch;

[0014] The first end of the SPDT switch is connected to the third end of the circulator, the second end of the SPDT switch is connected to the receiving unit, and the third end of the SPDT switch is connected to the load detection unit;

[0015] The first end and the second end of the SPDT switch are turned on when receiving a signal. The received signal input from the antenna port is sequentially transmitted from the second end of the circulator to the third end, and then transmitted from the first end of the SPDT switch to the second end and output to the receiving unit;

[0016] The first end and the third end of the SPDT switch are turned on when transmitting a signal. The standing wave signal of the antenna port is sequentially transmitted from the second end of the circulator to the third end, and then transmitted from the first end of the SPDT switch to the third end and output to the load detection unit.

[0017] In the transceiver circuit based on GaN power amplifier of the present invention, the receiving unit includes: a low-noise amplifier and a second band-pass filter;

[0018] The input end of the low-noise amplifier is connected to the second end of the SPDT switch, the output end of the low-noise amplifier is connected to the input end of the second band-pass filter, and the output end of the second band-pass filter is connected to the receiving end of the transceiver;

[0019] The low-noise amplifier is used to perform low-noise processing on the received signal;

[0020] The second band-pass filter is used to filter the received signal that has been processed by the low-noise amplifier and then transmit it to the transceiver.

[0021] In the transceiver circuit based on GaN power amplifier according to the present utility model, the load detection unit includes: a coupling detection circuit;

[0022] The input end of the coupling detection circuit is connected to the third end of the SPDT switch, and the output end of the coupling detection circuit outputs the reflection detection signal.

[0023] In the transceiver circuit based on GaN power amplifier according to the present utility model, the coupling detection circuit includes: a coupler, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a tenth capacitor, a first inductor, a first diode, and a fourteenth capacitor;

[0024] The first end of the coupler is connected to the third end of the SPDT switch, the second end of the coupler is grounded through the tenth resistor, and the eleventh resistor is grounded together with the tenth resistor;

[0025] The third end of the coupler is grounded through the twelfth resistor, the fourth end of the coupler is sequentially connected to the anode of the first diode through the thirteenth resistor and the tenth capacitor, the first end of the sixteenth resistor is connected to the fourth end of the coupler, the second ends of the sixteenth resistor and the fifteenth resistor are grounded, the first end of the fifteenth resistor is connected between the thirteenth resistor and the tenth capacitor, the first end of the first inductor is connected to the anode of the first diode, the second end of the first inductor is grounded, the cathode of the first diode is connected to the first ends of the fourteenth resistor and the eleventh capacitor and outputs the reverse detection signal, and the second ends of the fourteenth resistor and the eleventh capacitor are grounded.

[0026] In the transceiver circuit based on GaN power amplifier according to the present utility model, it further includes: a switch control unit;

[0027] The switch control unit is respectively connected to the load detection unit and the GaN power amplifier circuit, and is used to control the GaN power amplifier circuit to turn off based on the reverse detection signal output by the load detection unit.

[0028] In the transceiver circuit based on GaN power amplifier according to the present utility model, the switch control unit includes: a timing control circuit and a switch control circuit;

[0029] The timing control circuit is connected to the switch control circuit, and is used to output a start signal to the switch control circuit when power is on, so as to control the GaN power amplifier circuit to turn on through the switch control circuit;

[0030] The switch control circuit is connected to the GaN power amplifier circuit and is used to control the GaN power amplifier circuit to turn on according to the start signal or to control the GaN power amplifier circuit to turn off according to the reverse detection dependency.

[0031] In the transceiver circuit based on GaN power amplifier according to the present utility model, the timing control circuit includes: a timing chip, a sixth resistor, an eighth resistor, a second capacitor, and a negative voltage chip;

[0032] The switch control circuit includes: a seventh resistor, a third resistor, a second triode, a comparator, an AND gate, a fourth resistor, a first triode, a second resistor, a first resistor, and a first MOS transistor;

[0033] The first terminal of the timing chip is connected to the input terminal of the negative voltage chip. The output terminal of the negative voltage chip is connected to the GaN power amplifier through the sixth resistor. The first terminal of the eighth resistor is connected to the second terminal of the sixth resistor, and the second terminal of the eighth resistor is grounded. The second capacitor is connected between the first terminal and the second terminal of the timing chip. The third terminal of the timing chip is connected to the base of the second triode through the seventh resistor. The emitter of the second triode is grounded. The collector of the second triode is connected to VCC through the third resistor and the collector of the second triode is connected to the first input terminal of the AND gate. The second input terminal of the AND gate is connected to the output terminal of the comparator. The negative input terminal of the comparator receives the reverse detection signal. The output terminal of the comparator is connected to a reference voltage. The output terminal of the AND gate is connected to the base of the first triode through the fourth resistor. The emitter of the first triode is grounded. The collector of the first triode is connected to the gate of the first MOS transistor through the second resistor. The drain of the first MOS transistor is connected to the GaN power amplifier circuit. The source of the first MOS transistor receives a high-level signal. The first resistor is connected between the gate and the source of the first MOS transistor.

[0034] The present utility model further provides a transceiver system, including: the above-mentioned transceiver circuit based on GaN power amplifier.

[0035] Implementing the transceiver circuit and transceiver system based on GaN power amplifier of the present utility model has the following beneficial effects: It includes: a main control unit, a transceiver, a transmitting unit, a receiving unit, a switching unit, and a load detection unit; the transmitting unit is connected to the transceiver and is used to amplify the transmitting signal generated by the transceiver and then output it to the antenna port; the receiving unit is used to receive the received signal accessed from the antenna port and process the received signal and then transmit it to the transceiver when it is connected to the transmitting unit; the load detection unit is used to perform reflected power detection and output a reverse detection signal when it is connected to the transmitting unit, so as to control the on / off of the transmitting unit through the reverse detection signal. The present utility model can avoid the influence of standing wave signals on the pre-receiving circuit, can not only avoid the insertion loss of the coupling circuit from reducing the receiving sensitivity, but also improve the isolation degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0037] Figure 1 is the principle block diagram of the transceiver circuit based on GaN power amplifier provided by the present utility model;

[0038] Figure 2 and Figure 3 is the circuit diagram of a preferred embodiment of the transceiver circuit based on GaN power amplifier provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0040] In order to solve the problem that in the existing transceiver system, when transmitting a signal, due to the deterioration of the port standing wave or the low transceiver isolation degree of the circulator, the input power of the pre-receiving circuit exceeds the maximum tolerable power or even gets damaged, the present utility model provides a transceiver circuit based on GaN power amplifier. This transceiver circuit can not only avoid the receiving end from being damaged due to too large a transmitting leakage signal exceeding the maximum tolerable power of the receiving device, but also the reverse power detection at the load end can detect the standing wave at the antenna port, and when the port standing wave is too large, the power supply of the GaN power amplifier is turned off to achieve the purpose of protection.

[0041] Specifically, as Figure 1 shown, in a preferred embodiment, the transceiver circuit based on GaN power amplifier includes: a main control unit 10, a transceiver 20, a transmitting unit 30, a receiving unit 50, a switching unit 40, and a load detection unit 60.

[0042] The switching unit 40 is respectively connected to the transmitting unit 30, the receiving unit 50, the load detection unit 60, and the main control unit 10, and is configured to connect the transmitting unit 30 and the receiving unit 50 or connect the transmitting unit 30 and the load detection unit 60 according to the switching signal output by the main control unit 10.

[0043] Specifically, the transmitting unit 30 is connected to the transceiver 20, and is configured to amplify the transmission signal generated by the transceiver 20 and then output it to the antenna port; the receiving unit 50 is configured to receive the received signal accessed through the antenna port and process the received signal and then transmit it to the transceiver 20 when connected to the transmitting unit 30; the load detection unit 60 is configured to perform reflected power detection and output a reverse detection signal when connected to the transmitting unit 30, so as to control the on / off of the transmitting unit 30 through the reverse detection signal.

[0044] As Figure 1 shown, in this embodiment, the transmitting unit 30 includes: a preamplifier 31, a first band-pass filter 32, a GaN power amplifier circuit 33, and a circulator 34.

[0045] The input end of the preamplifier 31 is connected to the output end of the transceiver 20, the output end of the preamplifier 31 is connected to the input end of the first band-pass filter 32, the output end of the first band-pass filter 32 is connected to the input end of the GaN power amplifier circuit 33, the output end of the GaN power amplifier circuit 33 is connected to the first end of the circulator 34, the second end of the circulator 34 is connected to the antenna port, and the third end of the circulator 34 is connected to the switching unit 40.

[0046] Among them, the preamplifier 31 is configured to perform pre-amplification processing on the transmission signal; the GaN power amplifier circuit 33 is configured to perform power amplification on the transmission signal that has been pre-amplified by the preamplifier 31 and then transmit it from the first end to the second end of the circulator 34 and output it to the antenna port.

[0047] Optionally, in this embodiment, the switching unit 40 includes: an SPDT switch. Among them, the first end of the SPDT switch is connected to the third end of the circulator 34, the second end of the SPDT switch is connected to the receiving unit 50, and the third end of the SPDT switch is connected to the load detection unit 60; the first end and the second end of the SPDT switch are turned on when receiving a signal, and the received signal input from the antenna port is sequentially transmitted from the second end to the third end of the circulator 34, and then transmitted from the first end to the second end of the SPDT switch and output to the receiving unit 50; the first end and the third end of the SPDT switch are turned on when transmitting a signal, and the standing wave signal of the antenna port is sequentially transmitted from the second end to the third end of the circulator 34, and then transmitted from the first end to the third end of the SPDT switch and output to the load detection unit 60.

[0048] As Figure 1 shown, in this embodiment, the receiving unit 50 includes: a low-noise amplifier 51 and a second band-pass filter 52. Among them, the input end of the low-noise amplifier 51 is connected to the second end of the SPDT switch, the output end of the low-noise amplifier 51 is connected to the input end of the second band-pass filter, and the output end of the second band-pass filter is connected to the receiving end of the transceiver 20; the low-noise amplifier 51 is used for performing low-noise processing on the received signal; the second band-pass filter 52 is used for filtering the received signal processed by the low-noise amplifier 51 and then transmitting it to the transceiver 20.

[0049] Optionally, in this embodiment, the load detection unit 60 includes: a coupling detection circuit. Among them, the input end of the coupling detection circuit is connected to the third end of the SPDT switch, and the output end of the coupling detection circuit outputs a reflection detection signal.

[0050] Furthermore, as Figure 1 shown, the transceiver circuit based on GaN power amplifier further includes: a switch control unit 70; the switch control unit 70 is respectively connected to the load detection unit 60 and the GaN power amplifier circuit 33, and is used for controlling the GaN power amplifier circuit 33 to turn off based on the reverse detection signal output by the load detection unit 60.

[0051] Optionally, the switch control unit 70 includes: a timing control circuit and a switch control circuit; the timing control circuit is connected to the switch control circuit, and is used for outputting a start signal to the switch control circuit when powering on, so as to control the GaN power amplifier circuit 33 to turn on through the switch control circuit; the switch control circuit is connected to the GaN power amplifier circuit 33, and is used for controlling the GaN power amplifier circuit 33 to turn on according to the start signal, or controlling the GaN power amplifier circuit 33 to turn off according to the reverse detection dependence.

[0052] Specifically, as Figure 1 shown, the transceiver 20 is responsible for generating a transmission signal. After the transmission signal is amplified by the pre-amplifier 31, it is further amplified by the GaN in Suzhou, then passes from the first end to the second end of the circulator 34, and then is output to the antenna port. Among them, after passing through the SPDT switch at the third end of the circulator 34, one path is connected to the load end (i.e., the load detection unit 60) for reverse power detection, and the other path is connected to the pre-receiving low-noise amplifier 51 (LNA) for amplifying the received signal, and then passes through the second band-pass filter 52 for spurious filtering and then is input to the transceiver 20.

[0053] Among them, the main control unit 10 is used to generate a switching signal to control the switching of the SPDT switch through this switching signal, so as to connect the third end of the circulator 34 to the load end in the transmitting state and connect the third end of the circulator 34 to the receiving end in the receiving state. Optionally, the main control unit 10 adopted by the present invention can be an MCU, and a conventional MCU can be used as long as it can realize the switching control of the SPDT switch.

[0054] The receiving SPDT switch is responsible for switching to the load end in the transmitting state and switching to the receiving end in the receiving state. When in the transmitting state, the transmitted signal flowing to the receiving end is effectively reduced due to the isolation degree of the SPDT and the isolation degree of the circulator 34, avoiding the receiving end being damaged due to excessive transmitted leakage signal exceeding the maximum power that the receiving device can withstand; at the same time, the reverse power detection at the load end can detect the standing wave of the antenna port. When the port standing wave is too large, the GaN power amplifier power supply is turned off.

[0055] Next, the principle of the transceiver circuit based on GaN power amplifier of the present invention will be described with a specific embodiment.

[0056] Specifically, in a preferred embodiment, as Figure 2 and Figure 3 shown, U8 is the preamplifier 31, U6 is the first band-pass filter 32, U7 is the GaN power amplifier, T1 is the circulator 34, U9 is the SPDT switch, U12 is the LNA, U10 is the second band-pass filter 52, and U11 is the coupler.

[0057] The coupling detection circuit includes: coupler U11, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, sixteenth resistor R16, tenth capacitor C10, first inductor L1, first diode D1, and eleventh capacitor C11.

[0058] The first end of the coupler U11 is connected to the third end of the SPDT switch. The second end of the coupler U11 is grounded through the tenth resistor R10, and the eleventh resistor R11 is grounded together with the tenth resistor R10. The third end of the coupler U11 is grounded through the twelfth resistor R12. The fourth end of the coupler U11 is sequentially connected to the anode of the first diode D1 through the thirteenth resistor R13 and the tenth capacitor C10. The first end of the sixteenth resistor R16 is connected to the fourth end of the coupler U11. The second end of the sixteenth resistor R16 and the second end of the fifteenth resistor R15 are grounded. The first end of the fifteenth resistor R15 is connected between the thirteenth resistor R13 and the tenth capacitor C10. The first end of the first inductor L1 is connected to the anode of the first diode D1. The second end of the first inductor L1 is grounded. The cathode of the first diode D1 is connected to the first end of the fourteenth resistor R14 and the first end of the eleventh capacitor C11 and outputs a reverse detection signal. The second end of the fourteenth resistor R14 and the second end of the eleventh capacitor C11 are grounded.

[0059] The timing control circuit includes: a timing chip U3, a sixth resistor R6, an eighth resistor R8, a second capacitor C2, and a negative voltage chip U4.

[0060] The switch control circuit includes: a seventh resistor R7, a third resistor R3, a second triode Q2, a comparator U5, an AND gate U2, a fourth resistor R4, a first triode Q1, a second resistor R2, a first resistor R1, and a first MOS transistor U1. The first end of the timing chip U3 is connected to the input end of the negative voltage chip U4. The output end of the negative voltage chip U4 is connected to the GaN power amplifier through the sixth resistor R6. The first end of the eighth resistor R8 is connected to the second end of the sixth resistor R6. The second end of the eighth resistor R8 is grounded. The second capacitor C2 is connected between the first end and the second end of the timing chip U3. The third end of the timing chip U3 is connected to the base of the second triode Q2 through the seventh resistor R7. The emitter of the second triode Q2 is grounded. The collector of the second triode Q2 is connected to VCC through the third resistor R3 and the collector of the second triode Q2 is connected to the first input end of the AND gate U2. The second input end of the AND gate U2 is connected to the output end of the comparator U5. The negative input end of the comparator U5 is connected to the reverse detection signal. The output end of the comparator U5 is connected to the reference voltage (Vref). The output end of the AND gate U2 is connected to the base of the first triode Q1 through the fourth resistor R4. The emitter of the first triode Q1 is grounded. The collector of the first triode Q1 is connected to the gate of the first MOS transistor U1 through the second resistor R2. The drain of the first MOS transistor U1 is connected to the GaN power amplifier circuit 33. The source of the first MOS transistor U1 is connected to a high-level signal (VPA 28V). The first resistor R1 is connected between the gate and the source of the first MOS transistor U1.

[0061] As Figure 2 and Figure 3As shown, RFTX is the transmission signal generated by transceiver 20. This transmission signal is amplified by preamplifier 31U8 and then input to U7. After being power-amplified by U7, it is output from the first end to the second end of circulator 34 and then to the antenna port. The standing wave reflection signal at the antenna port will not be reflected back to the first end of circulator 34, thus achieving the function of ensuring U7.

[0062] SPDT switch U9 can switch the reflection signal in the transmission state to the load end, avoiding the reverse signal from flowing to the pre-stage device U12 at the receiving end.

[0063] The coupler U11 can detect the magnitude of the reverse signal and output a reverse detection signal to comparator U5. When the detected reflection detection signal is too large, that is, when it exceeds the reference voltage Vref, comparator U5 outputs a low level, and this low level controls U1 to turn off the power supply of U7.

[0064] U3 is a timing chip. When powered on, U3 first outputs Vgs to control U7 to open the gate, and then outputs a POK low-level signal through its third terminal. After passing through the seventh resistor R7, this POK low-level signal controls the second triode Q2 to conduct. Both the first input terminal and the second input terminal of the AND gate input high levels, and the output terminal of the AND gate outputs a high level. This high level controls U1 to turn on and output Vds to supply power to the drain of the GaN power amplifier (i.e., U7) through the fourth resistor and the first triode in sequence.

[0065] As Figure 2 and Figure 3 As shown, when the transceiver system is in the transmission state, due to the standing wave reflection at the antenna port or the port not being connected, an excessive reverse signal flows from the second end of circulator 34 to the third end and reaches the receiving circuit. The present invention switches the reverse signal to the load end by adding an SPDT switch, avoiding damage to the pre-stage receiving circuit caused by long-term exposure to the reverse signal. At the same time, through the isolation of the two-stage devices of circulator 34 and SPDT switch, the isolation degree from the pre-stage receiving circuit to the transmitting end is improved, that is, the isolation degree can be improved without the need to use an SPDT switch with a higher withstand voltage.

[0066] Among them, the signal isolation is as follows:

[0067] When the maximum transmission power is 40 dBm, the output of the antenna port is normal. The isolation of the circulator 34 is above 20 dB, the isolation of the SPDT is above 25 dB, and the isolation of the pre-receiver circuit reaches above 45 dB. The maximum signal strength of the pre-receiver circuit is -5 dBm, which is much lower than the maximum tolerated power of the pre-receiver, 10 dBm. If the SPDT switch is not added, the signal leaking to the pre-receiver is 20 dBm, exceeding the maximum tolerated power of the pre-receiver. When there is a difference in the antenna port standing wave or no connection causes reflection, since the SPDT switch opens the load end, all the reverse signals flow to the load end, and the pre-receiver circuit does not bear all the reverse power.

[0068] A coupling detection circuit is designed at the load end of the SPDT switch, which can detect the magnitude of the reverse signal. When the reverse signal is too large and the detected voltage exceeds the reference voltage Vref, the comparator U5 outputs a low level, controlling the AND gate U2 to change from a high level to a low level, directly turning off U1 and disconnecting the power supply of the GaN power amplifier. At the same time, since the coupling detection circuit is not designed in front of the antenna port or at the input of the switch, it can avoid the insertion loss of the coupling circuit from reducing the receiving sensitivity.

[0069] The present utility model also provides a transceiver system, including the transceiver circuit based on GaN power amplifier disclosed by the present utility model.

[0070] The transceiver system of the present utility model can not only reduce the complexity of high-power transceiver systems, but also improve the reliability of products.

[0071] The above embodiments are only for illustrating the technical concept and features of the present utility model, and the purpose is to enable those who are familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot limit the protection scope of the present utility model. All equivalent changes and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A transceiver circuit based on a GaN power amplifier, characterized in that: include: Main control unit, transceiver, transmitting unit, receiving unit, switching unit and load detection unit; The switching unit is connected to the transmitting unit, the receiving unit, the load detection unit and the main control unit respectively, and is used to connect the transmitting unit with the receiving unit or connect the transmitting unit with the load detection unit according to the switching signal output by the main control unit; The transmitting unit is connected to the transceiver and is used to amplify the transmission signal generated by the transceiver and then output it to the antenna port; The receiving unit is used to receive a receiving signal connected by the antenna port and transmit the receiving signal to the transceiver after processing the receiving signal when connected to the transmitting unit; The load detection unit is used to perform reflected power detection and output a reverse detection signal when connected to the transmitting unit, so as to control the on and off of the transmitting unit through the reverse detection signal.

2. The GaN power amplifier-based transceiver circuit according to claim 1, characterized in that: The transmitting unit comprises: a pre-amplifier, a first band-pass filter, a GaN power amplifier circuit and a circulator; The input end of the preamplifier is connected to the output end of the transceiver, the output end of the preamplifier is connected to the input end of the first bandpass filter, the output end of the first bandpass filter is connected to the input end of the GaN power amplifier circuit, the output end of the GaN power amplifier circuit is connected to the first end of the circulator, the second end of the circulator is connected to the antenna port, and the third end of the circulator is connected to the switching unit; The pre-amplifier is used to perform pre-amplification processing on the transmission signal; The GaN power amplifier circuit is used to amplify the power of the transmission signal after the pre-amplification processing by the pre-amplifier, transmit it to the second end through the first end of the circulator, and output it to the antenna port.

3. The GaN power amplifier-based transceiver circuit according to claim 2, characterized in that: The switching unit comprises: a SPDT switching switch; The first end of the SPDT switch is connected to the third end of the circulator, the second end of the SPDT switch is connected to the receiving unit, and the third end of the SPDT switch is connected to the load detection unit; The first end and the second end of the SPDT switch are connected when receiving a signal, and the receiving signal input from the antenna port is sequentially transmitted to the third end through the second end of the circulator, and then transmitted to the second end through the first end of the SPDT switch and output to the receiving unit; The first end and the third end of the SPDT switching switch are connected when transmitting a signal, and the standing wave signal of the antenna port is transmitted to the third end through the second end of the circulator in turn, and then transmitted to the third end through the first end of the SPDT switching switch and output to the load detection unit.

4. The GaN power amplifier-based transceiver circuit according to claim 3, characterized in that: The receiving unit comprises: a low noise amplifier and a second band pass filter; The input end of the low noise amplifier is connected to the second end of the SPDT switch, the output end of the low noise amplifier is connected to the input end of the second band pass filter, and the output end of the second band pass filter is connected to the receiving end of the transceiver; The low noise amplifier is used to perform low noise processing on the received signal; The second bandpass filter is used to filter the received signal processed by the low noise amplifier and then transmit it to the transceiver.

5. The GaN power amplifier-based transceiver circuit according to claim 3, characterized in that: The load detection unit comprises: a coupling detection circuit; The input end of the coupling detection circuit is connected to the third end of the SPDT switch, and the output end of the coupling detection circuit outputs the reflection detection signal.

6. The GaN power amplifier-based transceiver circuit according to claim 5, characterized in that: The coupling detection circuit includes: a coupler, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a tenth capacitor, a first inductor, a first diode and a fourteenth capacitor; The first end of the coupler is connected to the third end of the SPDT switch, the second end of the coupler is grounded through the tenth resistor, and the eleventh resistor and the tenth resistor are grounded; The third end of the coupler is grounded through the twelfth resistor, the fourth end of the coupler is connected to the anode of the first diode through the thirteenth resistor and the tenth capacitor in sequence, the first end of the sixteenth resistor is connected to the fourth end of the coupler, the second end of the sixteenth resistor and the second end of the fifteenth resistor are grounded, the first end of the fifteenth resistor is connected between the thirteenth resistor and the tenth capacitor, the first end of the first inductor is connected to the anode of the first diode, the second end of the first inductor is grounded, the cathode of the first diode is connected to the first end of the fourteenth resistor and the first end of the eleventh capacitor and outputs the reverse detection signal, and the second end of the fourteenth resistor and the second end of the eleventh capacitor are grounded.

7. The GaN power amplifier-based transceiver circuit according to claim 2, characterized in that: Also includes: Switch control unit; The switch control unit is connected to the load detection unit and the GaN power amplifier circuit respectively, and is used to control the GaN power amplifier circuit to turn off based on the reverse detection signal output by the load detection unit.

8. The GaN power amplifier-based transceiver circuit according to claim 7, characterized in that: The switch control unit comprises: a timing control circuit and a switch control circuit; The timing control circuit is connected to the switch control circuit, and is used to output a start signal to the switch control circuit when powered on, so as to control the GaN power amplifier circuit to turn on through the switch control circuit; The switch control circuit is connected to the GaN power amplifier circuit, and is used to control the GaN power amplifier circuit to turn on according to the start signal, or to control the GaN power amplifier circuit to turn off according to the reverse detection dependency.

9. The GaN power amplifier-based transceiver circuit according to claim 8, characterized in that: The timing control circuit comprises: a timing chip, a sixth resistor, an eighth resistor, a second capacitor, and a negative pressure chip; The switch control circuit includes: a seventh resistor, a third resistor, a second triode, a comparator, an AND gate, a fourth resistor, a first triode, a second resistor, a first resistor and a first MOS tube; The first end of the timing chip is connected to the input end of the negative voltage chip, the output end of the negative voltage chip is connected to the GaN power amplifier through the sixth resistor, the first end of the eighth resistor is connected to the second end of the sixth resistor, and the second end of the eighth resistor is grounded; the second capacitor is connected between the first end and the second end of the timing chip, the third end of the timing chip is connected to the base of the second transistor through the seventh resistor, the emitter of the second transistor is grounded, the collector of the second transistor is connected to VCC through the third resistor, and the collector of the second transistor is connected to the first input end of the AND gate, the second input end of the AND gate is connected to the output end of the comparator, the negative input end of the comparator is connected to the reverse detection signal, the output end of the comparator is connected to the reference voltage, the output end of the AND gate is connected to the base of the first transistor through the fourth resistor, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the gate of the first MOS tube through the second resistor, the drain of the first MOS tube is connected to the GaN power amplifier circuit, the source of the first MOS tube is connected to the high level signal, and the first resistor is connected between the gate and the source of the first MOS tube.

10. A transceiver system, characterized in that: include: The GaN power amplifier-based transceiver circuit according to any one of claims 1 to 9.

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