Radio frequency transceiver device

Abstract

The present application provides a radio frequency transceiver device, which includes an antenna unit, a first matching circuit, a receiving circuit, a second matching circuit, a transmitting circuit and an auxiliary circuit. The receiving circuit includes a mixing unit, and the auxiliary circuit includes a first transformer coil and a second transformer coil. The first matching circuit and the receiving circuit are configured to form a first signal receiving channel, which is used to receive and process a first radio frequency signal when the first radio frequency signal is a high-gain radio frequency signal, and then transmit the first radio frequency signal to the mixing unit. The second matching circuit and the auxiliary circuit are configured to form a second signal receiving channel, which is used to receive and process the first radio frequency signal when the first radio frequency signal is a medium or low-gain radio frequency signal, and then transmit the first radio frequency signal to the mixing unit. The present application provides another radio frequency transceiver device, which includes a third matching circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to wireless radio frequency circuit technology, and in particular, to a radio frequency transceiver circuit having an auxiliary circuit coupled to a receiving circuit and a transmitting circuit. BACKGROUND

[0002] A wireless radio frequency circuit mainly includes a transmitting circuit and a receiving circuit. In order to cover a wide power range, multiple sets of gain attenuation circuits are arranged in the path of the receiving circuit of the wireless radio frequency circuit. However, when designing different gain settings, the linearity can be limited by the off-state attenuation circuit in the signal path. When a large power signal is received, the off-state attenuation circuit will be affected by the large signal swing, resulting in a decrease in the linearity of the receiving circuit. This situation occurs especially when a middle gain signal is received. SUMMARY

[0003] Therefore, some embodiments of the present application provide a radio frequency transceiver device. The radio frequency transceiver device includes an antenna unit, a first matching circuit, a receiving circuit, a second matching circuit, a transmitting circuit, and an auxiliary circuit. The antenna unit is configured to receive a first radio frequency signal or transmit a second radio frequency signal. The first matching circuit is coupled to the antenna unit. The receiving circuit is coupled to the first matching circuit. The receiving circuit includes a mixing unit. The second matching circuit is coupled to the antenna unit. The transmitting circuit is coupled to the second matching circuit. The second matching circuit and the transmitting circuit form a signal transmitting path. The signal transmitting path is configured to transmit the second radio frequency signal. The auxiliary circuit includes a first transformer coil and a second transformer coil. The first transformer coil is coupled between the second matching circuit and the transmitting circuit. The second transformer coil is coupled to the mixing unit. The first matching circuit and the receiving circuit are configured to form a first signal receiving path. When the first radio frequency signal is a high gain radio frequency signal, the first signal receiving path is configured to receive and process the first radio frequency signal to transmit the first radio frequency signal to the mixing unit. The second matching circuit and the auxiliary circuit are configured to form a second signal receiving path. When the first radio frequency signal is a middle or low gain radio frequency signal, the second signal receiving path is configured to receive and process the first radio frequency signal to transmit the first radio frequency signal to the mixing unit.

[0004] Some embodiments of the present disclosure provide a radio frequency transceiver device. The radio frequency transceiver device includes an antenna unit, a first matching circuit, a receiving circuit, a second matching circuit, a transmitting circuit, a third matching circuit, and an auxiliary circuit. The antenna unit is configured to receive a first radio frequency signal or transmit a second radio frequency signal. The first matching circuit is coupled to the antenna unit. The receiving circuit is coupled to the first matching circuit. The receiving circuit includes a mixing unit. The second matching circuit is coupled to the antenna unit. The transmitting circuit is coupled to the second matching circuit. The second matching circuit and the transmitting circuit form a signal transmitting path. The signal transmitting path is configured to transmit the second radio frequency signal. The third matching circuit is coupled to the antenna unit. The auxiliary circuit includes a first transformer coil and a second transformer coil. The first transformer coil is coupled to the third matching circuit. The second transformer coil is coupled to the mixing unit. The first matching circuit and the receiving circuit are configured to form a first signal receiving path. The first signal receiving path is used to receive and process the first radio frequency signal when the first radio frequency signal is a high gain radio frequency signal, and transmit the first radio frequency signal to the mixing unit. The third matching circuit and the auxiliary circuit are configured to form a second signal receiving path. The second signal receiving path is used to receive and process the first radio frequency signal when the first radio frequency signal is a medium or low gain radio frequency signal, and transmit the first radio frequency signal to the mixing unit.

[0005] In summary, to improve linearity, some embodiments of the present disclosure provide a radio frequency transceiver device that uses an auxiliary circuit in combination with a matching circuit to receive medium and low gain radio frequency signals in a signal receiving mode, thereby improving the linearity of the receiving circuit and making the circuit design of the radio frequency transceiver device more flexible. Since the auxiliary circuit includes a first transformer coil and a second transformer coil, as long as the number of turns of the first transformer coil and the second transformer coil is designed appropriately according to requirements, the auxiliary circuit can be considered as a first stage circuit with gain, thereby reducing the noise figure. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 FIG. 1 is a block diagram of a radio frequency transceiver device and a back-end circuit according to an embodiment of the present disclosure.

[0007] Figure 2 FIG. 2 is a circuit diagram of a radio frequency transceiver device according to an embodiment of the present disclosure.

[0008] Figure 3 FIG. 3 is a circuit diagram of a mixing unit according to an embodiment of the present disclosure.

[0009] Figure 4 FIG. 4 is a circuit diagram of a mixing unit according to an embodiment of the present disclosure.

[0010] Figure 5-1 FIG. 5 is an equivalent impedance diagram according to an embodiment of the present disclosure.

[0011] Figure 5-2is an equivalent impedance diagram according to an embodiment of the present application.

[0012] Figure 6 is a block diagram of a radio transceiver device and a back-end circuit according to an embodiment of the present application.

[0013] Symbol explanation

[0014] 100, 600: radio transceiver device

[0015] 110: antenna unit

[0016] 120: first matching circuit

[0017] 130: second matching circuit

[0018] 140: reception circuit

[0019] 150: auxiliary circuit

[0020] 160: transmission circuit

[0021] 111: antenna

[0022] 112: switching circuit

[0023] 141: mixing unit

[0024] 170: first processing circuit

[0025] 180: second processing circuit

[0026] 190: processor

[0027] L1, L2, L3, L6, L7: inductor

[0028] SW1: switching element

[0029] 142: low noise amplifier

[0030] C1, C2: capacitor element

[0031] 131, 6011: inductor pair

[0032] L4: first transformer coil

[0033] L5: second transformer coil

[0034] 161: power amplifier

[0035] 1411, 1412, 1413, 162: mixer

[0036] Z in1 : first resistance value

[0037] Z in2: second resistance value

[0038] 601: third matching circuit DETAILED DESCRIPTION

[0039] The foregoing and other technical contents, features and technical effects of the present application will be clearly presented in the following detailed description of embodiments in conjunction with the accompanying drawings. The thickness or size of each element in the drawings is exaggerated or omitted or approximated for the understanding and reading of those skilled in the art, and the size of each element is not completely the actual size, and is not intended to limit the implementation of the present application, and therefore does not have technical significance. Any modification, change of proportion relationship or adjustment of size, without affecting the technical effects and purposes that can be achieved by the present application, shall still fall within the scope of the disclosed technical content. The same reference numbers will be used to represent the same or similar elements in all the drawings. The term "coupled" or "connected" mentioned in the following embodiments can refer to any direct or indirect connection means.

[0040] Figure 1 is a block diagram of a radio frequency transceiver device and a back-end circuit according to an embodiment of the present application. Figure 2 is a circuit diagram of a radio frequency transceiver device according to an embodiment of the present application. Please refer to Figure 1 and Figure 2 The radio frequency transceiver device 100 includes an antenna unit 110, a first matching circuit 120, a receiving circuit 140, a second matching circuit 130, a transmitting circuit 160, and an auxiliary circuit 150. The antenna unit 110 includes an antenna 111 and a switching circuit 112. The antenna 111 is coupled to the switching circuit 112. The switching circuit 112 is configured to switch the antenna unit 110 to a signal transmitting mode or a signal receiving mode to receive a first radio frequency signal or transmit a second radio frequency signal.

[0041] In this embodiment, after receiving the first radio frequency signal, the radio frequency transceiver device 100 needs to appropriately amplify the first radio frequency signal according to the signal strength of the first radio frequency signal. According to the gain size required to amplify the first radio frequency signal, the first radio frequency signal can be divided into three types: high-gain radio frequency signal, medium-gain radio frequency signal, and low-gain radio frequency signal. Among them, when the received signal range is above -30dBm, it is a low-gain radio frequency signal, when the received signal range value is between -50dBm and -30dBm, it is a medium-gain radio frequency signal, and when the received signal range is below -50dBm, it is a high-gain radio frequency signal. "Medium-low gain radio frequency signal" means that the signal is a medium-gain radio frequency signal or a low-gain radio frequency signal.

[0042] It should be noted that the above values are only used in this embodiment, and the present application is not limited thereto. As long as the gain required for amplifying the first radio frequency signal is determined, and the first radio frequency signal is at least divided into high, medium and low, it is within the scope of the present application.

[0043] The first matching circuit 120 is coupled to the antenna unit 110, and the receiving circuit 140 is coupled to the first matching circuit 120. The function of the first matching circuit 120 is to make the signal transmitted from the antenna unit 110 to the receiving circuit 140 most effective, and to avoid reflection as much as possible during transmission.

[0044] The receiving circuit 140 includes a mixing unit 141. The mixing unit 141 is used to receive the first radio frequency signal transmitted from the receiving circuit 140, and the mixing unit 141 also reduces the frequency of the first radio frequency signal to the base frequency and demodulates it into differential analog I signal and analog Q signal. After the first radio frequency signal is demodulated into differential analog I signal and analog Q signal, it is transmitted to the first processing circuit 170 to be converted into digital I signal and digital Q signal. The converted digital I signal and digital Q signal are then transmitted to the processor 190 for signal processing.

[0045] The first processing circuit 170 includes an analog-digital conversion circuit to convert analog signals into digital signals.

[0046] The second matching circuit 130 is coupled to the antenna unit 110, and the transmitting circuit 160 is coupled to the second matching circuit 130. The second matching circuit 130 and the transmitting circuit 160 form a signal transmission channel. When the radio transceiver 100 is in signal transmission mode, the processor 190 at the back end encodes the digital signal to be transmitted into digital I signal and digital Q signal, and then transmits the digital I signal and digital Q signal to the second processing circuit 180. The second processing circuit 180 converts the digital I signal and digital Q signal into analog I signal and analog Q signal, and then transmits them to the transmitting circuit 160. The transmitting circuit 160 generates a second radio frequency signal according to the analog signal, and then transmits it in sequence through the second matching circuit 130 and the antenna unit 110.

[0047] The second processing circuit 180 includes a digital-analog conversion circuit to convert digital signals into analog signals.

[0048] The signal transmission channel is configured to transmit the second radio frequency signal from the second processing circuit 180 and the processor 190. The function of the second matching circuit 130 is to make the signal transmitted from the transmitting circuit 160 to the antenna unit 110 most effective, and to avoid reflection as much as possible during transmission.

[0049] To improve the linearity reduction problem, in the embodiment, an auxiliary circuit 150 is provided. The auxiliary circuit 150 includes a first transformer coil L4 and a second transformer coil L5. The first transformer coil L4 is coupled between the second matching circuit 130 and the transmitting circuit 160, and the second transformer coil L5 is coupled to the mixing unit 141. The first matching circuit 120 and the receiving circuit 140 are configured to form a first signal receiving path for receiving and processing the first radio frequency signal when the first radio frequency signal is the high-gain radio frequency signal, and transmitting the first radio frequency signal to the mixing unit 141. The second matching circuit 130 and the auxiliary circuit 150 are configured to form a second signal receiving path for receiving and processing the first radio frequency signal when the first radio frequency signal is the medium-low-gain radio frequency signal, and transmitting the first radio frequency signal to the mixing unit 141. Since there is no switch element in the second signal receiving path for transmitting the medium and low-gain radio frequency signal, the switch element in the off state does not affect the linearity of the receiving circuit 140. In addition, in the embodiment, as long as the number of turns of the first transformer coil L4 and the second transformer coil L5 is designed appropriately according to the requirements, the auxiliary circuit 150 can be regarded as a first-stage circuit with gain, and the noise figure can be reduced.

[0050] Referring to Figure 2 In an embodiment of the present application, the receiving circuit 140 further includes a low-noise amplifier 142. The low-noise amplifier 142 is coupled to the first matching circuit 120 to receive the first radio frequency signal transmitted by the first matching circuit 120. The low-noise amplifier 142 is configured to perform signal amplification on the first radio frequency signal when the first radio frequency signal is the high-gain radio frequency signal.

[0051] Referring to Figure 2 In an embodiment of the present application, the first matching circuit 120 includes an inductor L1 and a switch element SW1. The inductor L1 is coupled to the antenna unit 110 and the low-noise amplifier 142, and the first end of the switch element is coupled between the inductor L1 and the low-noise amplifier 142. The second end of the switch element SW1 is coupled to the ground. The switch element SW1 is configured to be set to the non-conductive state when the first radio frequency signal is the high-gain radio frequency signal, so that the inductor L1 and the low-noise amplifier 142 form the first signal receiving path for receiving and processing the first radio frequency signal. The switch element SW1 and the low-noise amplifier 142 are configured such that when the first radio frequency signal is the medium-low-gain radio frequency signal, the switch element SW1 is set to the conductive state, and the low-noise amplifier 142 is set to the off state, so that the second matching circuit 130 and the auxiliary circuit 150 form the second signal receiving path for receiving and processing the first radio frequency signal.

[0052] When the radio transceiver 100 is in signal transmitting mode, the second radio signal has a large power. In order to avoid the large power of the second radio signal from affecting the low noise amplifier 142 of the receiving circuit 140, the switch element SW1 is set to be in conducting state so as to conduct the excess power to the ground, thereby protecting the low noise amplifier 142 of the receiving circuit 140.

[0053] Please refer to Figure 2 In an embodiment of the present application, the second matching circuit 130 further comprises a capacitor element C1 and an inductor pair 131. The capacitor element C1 is coupled to the antenna unit 110 and the ground. The inductor pair 131 comprises an inductor L2 and an inductor L3. The inductor L2 is connected in parallel to the capacitor element C1 and is coupled to the antenna unit 110 and the ground. The inductor L3 is coupled to the transmitting circuit 160 and the first transformer coil L4 of the auxiliary circuit 150. The inductor pair 131 is used to convert a single-ended signal into a differential signal in signal receiving mode, which can reduce the signal strength by half to improve the linearity. The inductor pair 131 is used to convert a differential signal into a single-ended signal in signal transmitting mode.

[0054] Please refer to Figure 1 and Figure 2 When the radio transceiver 100 is in signal receiving mode and the first radio signal is the aforementioned high-gain radio signal, the processor 190 controls the switch element SW1 to remain in non-conducting state, and the processor 190 controls the low noise amplifier 142 to be in working state, so that the first signal receiving channel formed by the inductor LI, the low noise amplifier 142 and the mixing unit 141 receives and processes the first radio signal. When the first radio signal is a medium or low-gain radio signal, the processor 190 controls the switch element SW1 to be in conducting state and the processor 190 controls the low noise amplifier 142 to be in off state, at this time, the second signal receiving channel formed by the capacitor element C1, the inductor L2, the inductor L3, the first transformer coil L4 of the auxiliary circuit 150, the second transformer coil L5 receives and processes the first radio signal. In addition, when the radio transceiver 100 is in signal transmitting mode, the processor 190 controls the switch element SW1 to be in conducting state, at this time, the signal transmitting channel formed by the transmitting circuit 160 and the inductor L3, the inductor L2 and the capacitor element C1 is used to transmit the second radio signal, and the second radio signal is transmitted through the antenna unit 110.

[0055] In an embodiment of the present application, the transmitting circuit 160 comprises a power amplifier 161 and a mixer 162. Since the operation details of the transmitting circuit 160 are not the focus of the present application, they are not described in detail here.

[0056] Figure 3 is a circuit diagram of a mixing unit according to an embodiment of the present application. Please refer to Figure 3The mixing unit 141 comprises a mixer 1411. The mixer 1411 is coupled with the low noise amplifier 142, and the second transformer coil L5 of the auxiliary circuit 150 is coupled between the mixer 1411 and the low noise amplifier 142. In this way, when the first radio frequency signal is the high-low gain radio frequency signal, the mixer 1411 receives the first radio frequency signal from the first signal receiving channel and down-converts the first radio frequency signal to a base frequency signal and demodulates the base frequency signal into differential analog I and Q signals. When the first radio frequency signal is the medium-low gain radio frequency signal, the mixer 1411 receives the first radio frequency signal from the second signal receiving channel and down-converts the first radio frequency signal to a base frequency signal and demodulates the base frequency signal into differential analog I and Q signals.

[0057] Figure 4 Figure 2 is a circuit diagram of a mixing unit according to an embodiment of the present application. Please refer to Figure 4 The mixing unit 141 comprises two independent mixers 1412 and 1413. The mixer 1412 is coupled with the low noise amplifier 142, and the mixer 1413 is coupled with the second transformer coil L5 of the auxiliary circuit 150. In this embodiment, the two independent mixers 1412 and 1413 are configured such that when the first radio frequency signal is the high-low gain radio frequency signal, the mixer 1412 receives the first radio frequency signal from the first signal receiving channel and down-converts the first radio frequency signal to a base frequency signal and demodulates the base frequency signal into differential analog I and Q signals. When the first radio frequency signal is the medium-low gain radio frequency signal, the mixer 1413 receives the first radio frequency signal from the second signal receiving channel and down-converts the first radio frequency signal to a base frequency signal and demodulates the base frequency signal into differential analog I and Q signals. In this way, different mixer circuits can be used in the actual implementation of the mixers 1412 and 1413 according to different design requirements. For example, a switch-type mixer or an active mixer can be used to provide additional gain.

[0058] Figure 5-1 and Figure 5-2 Figure 4 is an equivalent impedance diagram according to different embodiments of the present application. Please refer to Figure 1 , Figure 2 , Figure 5-1 and Figure 5-2 In an embodiment of the present application, the turns ratio of the first transformer coil L4 and the second transformer coil L5 is determined by the first resistance value Z in1 and the second resistance value Z in2 . The first resistance value Z in1 is the equivalent impedance value of the first transformer coil L4 as viewed from the transmitting circuit 160, and the second resistance value Z in2 is the equivalent impedance value of the second transformer coil L5 as viewed from the mixing unit 141.

[0059] In this way,Figure 3 For the illustrated embodiments (see Figure 5-1 The first resistance value Z in1 The equivalent impedance value is the line-of-sight impedance from the first transformer coil L4 to the output of the power amplifier 161 in the transmitting circuit 160. The second resistance value is Z. in2 The equivalent impedance value of the second transformer coil L5 seen into the mixer 1411 of the mixer unit 141.

[0060] by Figure 4 For the illustrated embodiments (see Figure 5-2 The first resistance value Z in1 The equivalent impedance value is the line-of-sight impedance from the first transformer coil L4 to the output of the power amplifier 161 in the transmitting circuit 160. The second resistance value is Z. in2 The equivalent impedance value of the second transformer coil L5 seen into the mixer 1413 of the mixer unit 141.

[0061] In one embodiment of the present invention, the turns ratio of the first transformer coil L4 to the second transformer coil L5 can be determined by the following equation:

[0062]

[0063] Where N1 is the number of turns of the first transformer coil L4, and N2 is the number of turns of the second transformer coil L5.

[0064] In this embodiment, by setting the turns ratio of the first transformer coil L4 to the second transformer coil L5 using the aforementioned equation (1), the low impedance of the output terminal of the power amplifier 161 on the second signal receiving channel and the high impedance of the input of the mixer 1411 (or mixer 1413) can be matched. At the same time, due to the turns ratio of the first transformer coil L4 to the second transformer coil L5, the auxiliary circuit 150 can be regarded as a first-stage circuit with gain, which can reduce the noise figure.

[0065] Figure 6 This is a block diagram of a radio frequency transceiver device and back-end circuitry according to an embodiment of the present invention. Please refer to... Figure 6 , Figure 6 The radio frequency transceiver 600 shown is Figure 1 Compared to the RF transceiver 100 shown, the RF transceiver 600 further includes a third matching circuit 601, which is coupled to the antenna unit 110. The first transformer coil L4 of the auxiliary circuit 150 is... Figure 6The RF transceiver 600 is coupled to the third matching circuit 601 instead of the second matching circuit 130. In this embodiment, the third matching circuit 601 has the same circuit structure as the second matching circuit 130. Like the second matching circuit 130, the third matching circuit 601 includes the capacitor C2 and the inductor pair 6011. The capacitor C2 is coupled to the antenna unit 110 and the ground. The inductor pair 6011 includes the inductor L6 and the inductor L7. The inductor L6 is in parallel with the capacitor C2 and is coupled to the antenna unit 110 and the ground. The inductor L7 is coupled to the first transformer coil L4 of the auxiliary circuit 150. The inductor pair 6011 is used to convert a single signal into a differential signal in the signal receiving mode.

[0066] The first matching circuit 120 and the receiving circuit 140 are configured to form a first signal receiving path. The first signal receiving path is used to receive and process the first RF signal when the first RF signal is the high gain RF signal to transmit the first RF signal to the mixing unit 141. The third matching circuit 601 and the auxiliary circuit 150 are configured to form a second signal receiving path. The second signal receiving path is used to receive and process the first RF signal when the first RF signal is the medium or low gain RF signal to transmit the first RF signal to the mixing unit 141.

[0067] The possible implementations of the first matching circuit 120, the receiving circuit 140, the mixing unit 141, the transmitting circuit 160, the second matching circuit 130 and the auxiliary circuit 150 of the RF transceiver 600 are the same as those of the RF transceiver 100. Please refer to the descriptions of the previous embodiments for more details.

[0068] In this embodiment of the present application, when the RF transceiver 600 is in the signal receiving mode and the first RF signal is the high gain RF signal, the processor 190 controls the switch element SW1 to remain in the non-conductive state and controls the low noise amplifier 142 to be in the working state. As a result, the first signal receiving path formed by the inductor L1, the low noise amplifier 142 and the mixing unit 141 receives and processes the first RF signal. When the first RF signal is the medium or low gain RF signal, the processor 190 controls the switch element SW1 to be in the conductive state and controls the low noise amplifier 142 to be in the off state. At this time, the second signal receiving path formed by the capacitor C2, the inductor L6, the inductor L7, the first transformer coil L4 and the second transformer coil L5 of the auxiliary circuit 150 receives and processes the first RF signal. In addition, when the RF transceiver 600 is in the signal transmitting mode, the processor 190 controls the switch element SW1 to be in the conductive state. At this time, the signal transmitting path formed by the transmitting circuit 160 and the inductor L3, the inductor L2 and the capacitor C1 is used to transmit the second RF signal, which is then transmitted by the antenna unit 110.

[0069] It is to be noted that, although the third matching circuit 601 has the same circuit structure as the second matching circuit 130 in the present embodiment, the third matching circuit 601 and the second matching circuit 130 can have different circuit structures according to design requirements, and the present application is not limited thereto.

[0070] The above-described embodiments are merely intended to illustrate the technical ideas and characteristics of the present disclosure, and enable those skilled in the art to understand the content of the present disclosure and implement it, and are not intended to limit the claims of the present disclosure, i.e., equivalent changes or modifications made in accordance with the ideas disclosed by the present disclosure should still be covered by the claims of the present disclosure.

Claims

1. A radio frequency transceiver device, comprising: an antenna unit configured to receive a first radio frequency signal or transmit a second radio frequency signal; a first matching circuit coupled to the antenna unit; a receiving circuit coupled to the first matching circuit, the receiving circuit comprising a mixing unit; a second matching circuit coupled to the antenna unit; a transmitting circuit coupled to the second matching circuit, the second matching circuit and the transmitting circuit forming a signal transmitting path configured to transmit the second radio frequency signal; and an auxiliary circuit comprising a first transformer coil and a second transformer coil, the first transformer coil coupled between the second matching circuit and the transmitting circuit, the second transformer coil coupled to the mixing unit; wherein the first matching circuit and the receiving circuit are configured to form a first signal receiving path for receiving and processing the first radio frequency signal to transmit the first radio frequency signal to the mixing unit when the first radio frequency signal is a high gain radio frequency signal, and the second matching circuit and the auxiliary circuit are configured to form a second signal receiving path for receiving and processing the first radio frequency signal to transmit the first radio frequency signal to the mixing unit when the first radio frequency signal is a medium or low gain radio frequency signal.

2. The radio frequency transceiver device of claim 1, wherein a turns ratio of the first transformer coil and the second transformer coil is determined by a first resistance value and a second resistance value, wherein the first resistance value is an equivalent resistance value of the first transformer coil looking into the transmitting circuit, and the second resistance value is an equivalent resistance value of the second transformer coil looking into the mixing unit.

3. The radio frequency transceiver device of claim 2, wherein the turns ratio is a square root of a ratio of the first resistance value and the second resistance value.

4. The radio frequency transceiver device of claim 1, wherein the receiving circuit further comprises: a low noise amplifier coupled to the first matching circuit, the low noise amplifier configured to receive and amplify the first radio frequency signal matched by the first matching circuit when the first radio frequency signal is the high gain radio frequency signal.

5. The radio frequency transceiver device of claim 4, wherein the mixing unit comprises a first mixer coupled to the low noise amplifier, and the second transformer coil is coupled between the first mixer and the low noise amplifier.

6. The radio frequency transceiver device of claim 4, wherein the mixing unit comprises a first mixer and a second mixer, the first mixer coupled to the low noise amplifier, and the second mixer coupled to the second transformer coil.

7. The radio frequency transceiver device of claim 4, wherein the first matching circuit further comprises: a first inductor coupled to the antenna unit and the low noise amplifier; and a switch element having a first end coupled between the first inductor and the low noise amplifier, and a second end coupled to a ground terminal. ​ wherein the switch element is configured to be set to a non-conductive state to make the first inductor and the low noise amplifier form the first signal receiving path for receiving and processing the first radio frequency signal when the first radio frequency signal is the high gain radio frequency signal; the switch element and the low noise amplifier are configured to be set to a conductive state and the low noise amplifier is set to an off state to make the second matching circuit and the auxiliary circuit form the second signal receiving path for receiving and processing the first radio frequency signal when the first radio frequency signal is the medium-low gain radio frequency signal.

8. The radio frequency transceiver device of claim 4, wherein the second matching circuit further comprises: a capacitor element coupled to the antenna unit and a ground terminal; and an inductor pair comprising a second inductor and a third inductor, the second inductor being in parallel with the capacitor element and coupled to the antenna unit and the ground terminal, and the third inductor being coupled to the transmission circuit and the first transformer coil of the auxiliary circuit.

9. A radio frequency transceiver device, comprising: an antenna unit configured to receive a first radio frequency signal or transmit a second radio frequency signal; a first matching circuit coupled to the antenna unit; a receiving circuit coupled to the first matching circuit, the receiving circuit comprising a mixing unit; a second matching circuit coupled to the antenna unit; a transmission circuit coupled to the second matching circuit, the second matching circuit and the transmission circuit forming a signal transmission path configured to transmit the second radio frequency signal; a third matching circuit coupled to the antenna unit; and an auxiliary circuit comprising a first transformer coil and a second transformer coil, the first transformer coil being coupled to the third matching circuit, and the second transformer coil being coupled to the mixing unit; wherein the first matching circuit and the receiving circuit are configured to form a first signal receiving path for receiving and processing the first radio frequency signal to transmit the first radio frequency signal to the mixing unit when the first radio frequency signal is a high gain radio frequency signal, and the third matching circuit and the auxiliary circuit are configured to form a second signal receiving path for receiving and processing the first radio frequency signal to transmit the first radio frequency signal to the mixing unit when the first radio frequency signal is a medium-low gain radio frequency signal.

10. The radio frequency transceiver device of claim 9, wherein the receiving circuit further comprises: a low noise amplifier coupled to the first matching circuit, the low noise amplifier being configured to receive and amplify the first radio frequency signal matched by the first matching circuit when the first radio frequency signal is the high gain radio frequency signal. ​

Images