RF transceiver circuit

Abstract

The present invention provides a radio frequency transceiver circuit, which includes an input matching circuit, a power amplifier circuit, an output matching circuit, a transceiver switching switch, a filter group, an antenna switch and an antenna; the output matching circuit includes a first capacitor, a first inductor, a second inductor, a plurality of second capacitors with different capacitance values, a third inductor and a plurality of third capacitors with different capacitance values; the filter group includes a plurality of filters, and the input ends of the plurality of filters are respectively connected to the plurality of second ends of the transceiver switching switch in a one-to-one correspondence; the transceiver switching switch is used to control the connection or disconnection of each of the second capacitors and each of the third capacitors with the corresponding filters in the filter group. The radio frequency transceiver circuit in the present invention can simultaneously make the performance of the power amplifier circuit and the harmonic suppression meet the requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a radio frequency transceiver circuit. Background Art

[0002] The existing sub-3G L-PAMID (RF transceiver module) includes multiple TX (transmitter) channels, and its RF signal passes through Input Stage Matching 1 (input stage matching) to PA (power amplifier). The power amplifier also includes Input Stage Matching 2 (inter-stage matching) according to the number of stages. The performance of the power amplifier is mainly determined by the output matching load (load impedance). The output matching circuit is usually placed on the Laminate (substrate), so the capacitor on the output matching circuit is generally an SMD (surface mount device). The output matching circuit is connected to the TRXSW (transceiver switching switch). The transceiver switching switch will switch the output of the power amplifier to different RF channels. Each RF channel is connected to the filter in the filter group (Filter) of the corresponding band (frequency band) to filter the signal of the corresponding frequency band, and then switched to the ANT (antenna) through the ASM (antenna switch).

[0003] Among them, the capacitor and inductor of the output matching circuit form a resonant network to suppress the third harmonic, but the power amplifier needs to ensure good performance and harmonic suppression within a broadband range covering all frequency bands, so as to ensure that the transmission performance and harmonic suppression of each RF channel of the RF transceiver module can meet the requirements.

[0004] The power amplifier in the prior art needs to pay attention to the performance of all frequency bands and the corresponding harmonic suppression, and the Nth harmonic frequency bandwidth of the power amplifier is N times the fundamental frequency bandwidth. It is far from enough to rely on only one resonant network for the harmonic suppression network of all frequency bands. However, if a new resonant network is added, additional insertion loss will be introduced. In addition, in order to ensure the performance of all frequency bands, it is also necessary to ensure that the load impedance covers all bandwidths. This will result in a large insertion loss in the output matching network and an unsatisfactory matching effect, which will ultimately lead to a decrease in the performance of the power amplifier. Summary of the invention

[0005] In view of the above shortcomings of the prior art, the present invention proposes a new radio frequency transceiver circuit to solve the problem that the radio frequency transceiver circuit in the prior art cannot simultaneously achieve the required performance of the power amplifier and harmonic suppression.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a radio frequency transceiver circuit, which includes an input matching circuit, a power amplifier circuit, an output matching circuit, a transceiver switching switch, a filter group, an antenna switch and an antenna;

[0008] The input end of the input matching circuit is used to receive a radio frequency signal;

[0009] The input end of the power amplifier circuit is connected to the output end of the input matching circuit;

[0010] The output matching circuit includes a first capacitor, a first inductor, a second inductor, a plurality of second capacitors with different capacitance values, a third inductor, and a plurality of third capacitors with different capacitance values ​​matching the number of the second capacitors; a first end of the first capacitor is connected to the output end of the power amplifier circuit, a first end of the first inductor is connected to the second end of the first capacitor, a second end of the first inductor is grounded, a first end of the second inductor is connected to the second end of the first capacitor, a plurality of first ends of the second capacitors are respectively connected to the second end of the second inductor, a first end of the third inductor is grounded, a plurality of first ends of the third capacitors are respectively connected to the second end of the third inductor, and a plurality of second ends of the third capacitors are respectively connected to the first ends of the plurality of second capacitors in a one-to-one correspondence;

[0011] The plurality of first ends of the transceiver switching switch are respectively connected to the second ends of the plurality of second capacitors in a one-to-one correspondence;

[0012] The filter group includes a plurality of filters, and the input ends of the plurality of filters are respectively connected to the plurality of second ends of the transceiver switching switch in a one-to-one correspondence; the transceiver switching switch is used to control the connection or disconnection of each of the second capacitors and each of the third capacitors with a corresponding one of the filters in the filter group;

[0013] The plurality of first ends of the antenna switch are respectively connected to the output ends of the plurality of filters in a one-to-one correspondence, and are used to control the connection or disconnection of the plurality of filters with the antenna;

[0014] The input end of the antenna is respectively connected to a plurality of second ends of the antenna switch, and the antenna is used for transmitting signals.

[0015] Preferably, the radio frequency transceiver circuit further includes a fourth capacitor, a first end of the fourth capacitor is connected to the output end of the input matching circuit, and a second end of the fourth capacitor is connected to the input end of the power amplifier circuit.

[0016] Preferably, the power amplifier circuit includes a first triode, a fourth inductor, an inter-stage matching circuit, a second triode, a fifth inductor and two bias circuits;

[0017] The base of the first transistor serves as the input end of the power amplifier circuit, and the emitter of the first transistor is grounded;

[0018] A first end of the fourth inductor is connected to an operating voltage, and a second end of the fourth inductor is connected to a collector of the first transistor;

[0019] The input end of the inter-stage matching circuit is connected to the collector of the first transistor;

[0020] The base of the second transistor is connected to the output end of the inter-stage matching circuit, the emitter of the second transistor is grounded, and the collector of the second transistor serves as the output end of the power amplifier circuit;

[0021] A first end of a fifth inductor is connected to an operating voltage, and a second end of the fifth inductor is connected to a collector of the second transistor;

[0022] The output ends of the two bias circuits are connected to the base of the first transistor and the base of the second transistor respectively.

[0023] Preferably, the power amplifier circuit further includes a fifth capacitor, a first end of the fifth capacitor is connected to the output end of the inter-stage matching circuit, and a second end of the fifth capacitor is connected to the base of the second transistor.

[0024] Preferably, the two bias circuits have the same structure, and each bias circuit includes a sixth inductor, a third triode, a fourth triode, a sixth capacitor, a seventh inductor, a fifth triode and an eighth inductor;

[0025] The first end of the sixth inductor is connected to the adjustment voltage;

[0026] The collector of the third triode is connected to the second end of the sixth inductor and the base of the third triode respectively;

[0027] The collector of the fourth triode is connected to the emitter of the third triode and the base of the fourth triode respectively, and the emitter of the fourth triode is grounded;

[0028] The first end of the sixth capacitor is connected to the base of the third transistor;

[0029] The first end of the seventh inductor is connected to the second end of the sixth capacitor, and the second end of the seventh inductor is grounded;

[0030] The base of the fifth transistor is connected to the base of the third transistor, and the collector of the fifth transistor is connected to the power supply voltage;

[0031] A first end of the eighth inductor is connected to the emitter of the fifth transistor, and a second end of the eighth inductor serves as an output end of the bias circuit.

[0032] Preferably, the transceiver switching switch includes multiple single-pole single-throw switches; the first ends of the multiple single-pole single-throw switches respectively serve as multiple first ends of the transceiver switching switch, and the second ends of the multiple single-pole single-throw switches respectively serve as multiple second ends of the transceiver switching switch.

[0033] Compared with the prior art, the RF transceiver circuit in the present invention utilizes the characteristics of the transceiver switching switch to select different channels, so as to set the parallel capacitor and the series capacitor of the power amplifier circuit according to the best performance and third harmonic suppression of each frequency band, that is, the multiple second capacitors and the multiple third capacitors are respectively set according to the best performance and third harmonic suppression of each frequency band. In this way, when different RF channels are turned on, the power amplifier circuit can perform at its best in the turned-on RF channels, which is equivalent to improving the performance of the power amplifier circuit. At the same time, for the load impedance optimization and harmonic suppression of the RF channels in different frequency bands, it is only necessary to maximize the performance in the narrowband RF channel where the power amplifier circuit is located. Harmonic suppression can also be targeted according to the frequency band selected by the RF channel, thereby maximizing the harmonic suppression of the power amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0035] Figure 1 A circuit module diagram of a radio frequency transceiver circuit provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of a partial structure circuit including an input matching circuit and a power amplifier circuit in a radio frequency transceiver circuit provided in an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of a partial structure circuit of a radio frequency transceiver circuit including an output matching circuit and a transceiver switching switch provided in an embodiment of the present invention;

[0038] Figure 4 The radio frequency transceiver circuit provided in the embodiment of the present invention includes a filter group, an antenna switch and a partial structural circuit schematic diagram of the antenna. DETAILED DESCRIPTION

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The embodiment of the present invention provides a radio frequency transceiver circuit 100, Figures 1 to 4 As shown, it includes an input matching circuit 1, a power amplifying circuit 2, an output matching circuit 3, a transmit / receive switching switch 4, a filter group 5, an antenna switch 6 and an antenna 7.

[0043] The input end of the input matching circuit 1 is used to receive a radio frequency signal (RFin).

[0044] The input end of the power amplifier circuit 2 is connected to the output end of the input matching circuit 1 .

[0045] The output matching circuit 3 includes a first capacitor C1, a first inductor L1, a second inductor L2, a plurality of second capacitors with different capacitance values, a third inductor L3, and a plurality of third capacitors with different capacitance values ​​matching the number of the second capacitors; a first end of the first capacitor C1 is connected to the output end of the power amplifier circuit 2, a first end of the first inductor L1 is connected to the second end of the first capacitor C1, a second end of the first inductor L1 is grounded, a first end of the second inductor L2 is connected to the second end of the first capacitor C1, first ends of a plurality of second capacitors are respectively connected to the second end of the second inductor L2, a first end of the third inductor L3 is grounded, first ends of a plurality of third capacitors are respectively connected to the second end of the third inductor L3, and second ends of a plurality of third capacitors are respectively connected to the first ends of a plurality of second capacitors in a one-to-one correspondence.

[0046] The multiple first ends of the transceiver switch 4 are respectively connected to the second ends of the multiple second capacitors in a one-to-one correspondence.

[0047] The filter group 5 includes multiple filters, and the input ends of the multiple filters are respectively connected one by one to the multiple second ends of the transceiver switching switch 4; the transceiver switching switch 4 is used to control the connection or disconnection of each second capacitor and each third capacitor with the corresponding filter in the filter group 5.

[0048] The multiple first ends of the antenna switch 6 are connected to the output ends of the multiple filters in a one-to-one correspondence, and are used to control the connection or disconnection of the multiple filters with the antenna 7 respectively.

[0049] The input end of the antenna 7 is respectively connected to the multiple second ends of the antenna switch 6, and the antenna 7 is used to transmit radio frequency signals.

[0050] In this embodiment, the RF transceiver circuit 100 further includes a fourth capacitor C4, a first end of the fourth capacitor C4 is connected to the output end of the input matching circuit 1, and a second end of the fourth capacitor C4 is connected to the input end of the power amplifier circuit 2. The fourth capacitor C4 serves as a DC blocking capacitor and can also serve as a part of the input matching circuit 1.

[0051] In this embodiment, the power amplifier circuit 2 includes a first transistor Q1, a fourth inductor L4, an inter-stage matching circuit 22, a second transistor Q2, a fifth inductor L5 and two bias circuits 21;

[0052] The base of the first transistor Q1 serves as the input terminal of the power amplifier circuit 2, and the emitter of the first transistor Q1 is grounded;

[0053] A first end of the fourth inductor L4 is connected to the operating voltage (Vcc), and a second end of the fourth inductor L4 is connected to the collector of the first transistor Q1;

[0054] The input end of the inter-stage matching circuit 22 is connected to the collector of the first transistor Q1, and is used to match the output of the first transistor with the input of the second transistor;

[0055] The base of the second transistor Q2 is connected to the output end of the inter-stage matching circuit 22, the emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 serves as the output end of the power amplifier circuit 2;

[0056] A first end of the fifth inductor L5 is connected to the operating voltage, and a second end of the fifth inductor L5 is connected to the collector of the second transistor Q2;

[0057] The output terminals of the two bias circuits 21 are connected to the base of the first transistor Q1 and the base of the second transistor Q2 respectively.

[0058] The power amplifier circuit 2 further includes a fifth capacitor C5, a first end of which is connected to the output end of the inter-stage matching circuit 22, and a second end of which is connected to the base of the second transistor Q2. The fifth capacitor C5 is used as a DC blocking capacitor and can also be used as a part of the inter-stage matching circuit 22.

[0059] The two bias circuits 21 have the same structure. Each bias circuit 21 includes a sixth inductor L6, a third transistor Q3, a fourth transistor Q4, a sixth capacitor C6, a seventh inductor L7, a fifth transistor Q5 and an eighth inductor L8.

[0060] A first terminal of the sixth inductor L6 is connected to the adjustment voltage (Vreg);

[0061] The collector of the third transistor Q3 is connected to the second end of the sixth inductor L6 and the base of the third transistor Q3 respectively;

[0062] The collector of the fourth triode Q4 is connected to the emitter of the third triode Q3 and the base of the fourth triode Q4 respectively, and the emitter of the fourth triode Q4 is grounded;

[0063] A first end of the sixth capacitor C6 is connected to the base of the third transistor Q3;

[0064] A first end of the seventh inductor L7 is connected to a second end of the sixth capacitor C6, and a second end of the seventh inductor L7 is grounded;

[0065] The base of the fifth transistor Q5 is connected to the base of the third transistor Q3, and the collector of the fifth transistor Q5 is connected to the power supply voltage (Vbatt);

[0066] A first end of the eighth inductor L8 is connected to the emitter of the fifth transistor Q5 , and a second end of the eighth inductor L8 serves as an output end of the bias circuit 21 .

[0067] In this embodiment, the transceiver switch 4 includes a plurality of single-pole single-throw switches; the first ends of the plurality of single-pole single-throw switches are respectively used as the plurality of first ends of the transceiver switch 4, and the second ends of the plurality of single-pole single-throw switches are respectively used as the plurality of second ends of the transceiver switch 4. Of course, according to actual needs, the transceiver switch 4 can also be designed as two single-pole multi-throw switches, so that the first single-pole multi-throw switch is designed between the second inductor L2 and the plurality of second capacitors, at which time the control end of the first single-pole multi-throw switch is connected to the second end of the second inductor L2, the plurality of connection ends of the first single-pole multi-throw switch are respectively connected to the first ends of the plurality of second capacitors, the control end of the second single-pole multi-throw switch is connected to the second end of the third inductor L3, the plurality of connection ends of the second single-pole multi-throw switch are respectively connected to the first ends of the plurality of third capacitors, and the plurality of filters in the corresponding filter group 5 are respectively directly connected to the second ends of the plurality of second capacitors.

[0068] The antenna switch 6 can select another multiple single-pole single-throw switches, or another single-pole multi-throw switch: if multiple single-pole single-throw switches are selected, the first ends of the multiple single-pole single-throw switches are respectively used as the multiple first ends of the antenna switch 6, and the second ends of the multiple single-pole single-throw switches are respectively used as the multiple second ends of the antenna switch 6; if a single-pole multi-throw switch is selected, the multiple connection ends of the single-pole multi-throw switch are respectively used as the multiple first ends of the antenna switch 6, and the control ends of the single-pole multi-throw switches are collectively used as the second ends of the antenna switch 6.

[0069] In this embodiment, channels of different frequency bands of the RF transceiver circuit 100 serve as different RF channels. Taking four RF channels as an example, the four RF channels are RF channel 1 (band1), RF channel 2 (band2), RF channel 3 (band3), RF channel 4 (band4), etc., and their number is set according to the frequency band requirements. The multiple second capacitors are Ca1, Ca2, Ca3, Ca4, etc., the multiple third capacitors are Cp1, Cp2, Cp3, Cp4, etc., the multiple single-pole single-throw switches in the transceiver switching switch 4 are S1, S2, S3, S4, etc., and the multiple filters in the filter group 5 are Z1, Z2, Z3, Z4, etc.

[0070] In the RF transceiver circuit 100 of this embodiment, after the transceiver switching switch 4 selects the output RF channel, the third capacitor in parallel with the RF channel is synchronously connected to the third inductor L3 to be grounded through the control of the transceiver switching switch 4, and the second capacitor in series with the RF channel and the first capacitor C1, the third capacitor, the first inductor L1, the second inductor L2 and the third inductor L3 form an output matching network of the power amplifier circuit 2. The output matching network makes the power amplifier circuit 2 have the best performance in each RF channel. At the same time, the third capacitor and the third inductor L3 resonate at the third harmonic frequency of the corresponding frequency of the RF channel. At this time, the performance and third harmonic suppression of the power amplifier circuit 2 in the RF channel are optimal. When the RF signal passes through the filter and the switching of the antenna switch 6, it is output to the antenna 7.

[0071] When the transceiver switching switch 4 selects the output RF channel band1, the third capacitor Cp1 in parallel with the RF channel is synchronously connected to the third inductor L3 through the control of the transceiver switching switch 4, and the second capacitor Ca1 in series with the first capacitor C1, the third capacitor Cp1, the first inductor L1, the second inductor L2 and the third inductor L3 form an output matching network of the power amplifier circuit 2. The output matching network makes the power amplifier circuit 2 have the best performance in the RF channel band1. At the same time, the third capacitor Cp1 and the third inductor L3 resonate at the third harmonic frequency of the corresponding frequency of the RF channel band1. At this time, the performance and third harmonic suppression of the power amplifier circuit 2 in the RF channel band1 are optimal. When the RF signal passes through the filter of band1 and the switching of the antenna switch 6, it is output to the antenna 7; when the transceiver switching switch 4 selects the output RF channel band 2, the third capacitor Cp2 connected in parallel with the RF channel is synchronously connected to the third inductor L3 through the control of the transmit-receive switching switch 4 to be grounded, and the second capacitor Ca2 connected in series with the first capacitor C1, the third capacitor Cp2, the first inductor L1, the second inductor L2 and the third inductor L3 form an output matching network of the power amplifier circuit 2, which makes the performance of the power amplifier circuit 2 in the RF channel band2 the best. At the same time, the third capacitor Cp2 and the third inductor L3 resonate at the third harmonic frequency of the corresponding frequency of the RF channel band2. At this time, the performance and third harmonic suppression of the power amplifier circuit 2 in the RF channel band2 are optimal, and the RF signal is output to the antenna 7 after passing through the filter of band2 and the switching of the antenna switch 6; the principle and effect of selecting other RF channels are the same as those of the above-mentioned RF channels band1 and band2.

[0072] Compared with the prior art, the RF transceiver circuit 100 in this embodiment uses the characteristics of the transceiver switching switch 4 to select different channels, so as to set the parallel capacitor and the series capacitor of the power amplifier circuit 2 according to the best performance and third harmonic suppression of each frequency band, that is, the multiple second capacitors and the multiple third capacitors are set according to the best performance and third harmonic suppression of each frequency band, so that when different RF channels are turned on, the power amplifier circuit 2 can play the best performance in the turned-on RF channels, which is equivalent to improving the performance of the power amplifier circuit 2. At the same time, for the load impedance optimization and harmonic suppression of the RF channels of different frequency bands, it is only necessary to play the maximum performance in the narrowband RF channel where the power amplifier circuit 2 is located. Harmonic suppression can also be targeted according to the frequency band selected by the RF channel, thereby maximizing the harmonic suppression of the power amplifier. At the same time, the capacitors in the output matching of the power amplifier in the prior art are generally in the form of SMD, while in this embodiment, the output capacitors (second capacitors and third capacitors) of the power amplifier circuit 2 are directly connected to the transceiver switching switch 4, thereby reducing the output matching devices of the power amplifier circuit 2 and greatly reducing the area occupied by the output matching of the power amplifier circuit 2.

[0073] It should be noted that the various embodiments described above with reference to the accompanying drawings are only used to illustrate the present invention rather than to limit the scope of the present invention. Those skilled in the art should understand that any modification or equivalent substitution of the present invention without departing from the spirit and scope of the present invention should be included within the scope of the present invention. In addition, unless otherwise indicated by the context, words appearing in the singular include the plural form, and vice versa. In addition, unless otherwise specified, all or part of any embodiment may be used in combination with all or part of any other embodiment.

Claims

1. A radio frequency transceiver circuit, characterized in that: The radio frequency transceiver circuit includes an input matching circuit, a power amplifier circuit, an output matching circuit, a transceiver switching switch, a filter group, an antenna switch and an antenna; The input end of the input matching circuit is used to receive a radio frequency signal; The input end of the power amplifier circuit is connected to the output end of the input matching circuit; The output matching circuit includes a first capacitor, a first inductor, a second inductor, a plurality of second capacitors with different capacitance values, a third inductor, and a plurality of third capacitors with different capacitance values ​​matching the number of the second capacitors; a first end of the first capacitor is connected to the output end of the power amplifier circuit, a first end of the first inductor is connected to the second end of the first capacitor, a second end of the first inductor is grounded, a first end of the second inductor is connected to the second end of the first capacitor, a plurality of first ends of the second capacitors are respectively connected to the second end of the second inductor, a first end of the third inductor is grounded, a plurality of first ends of the third capacitors are respectively connected to the second end of the third inductor, and a plurality of second ends of the third capacitors are respectively connected to the first ends of the plurality of second capacitors in a one-to-one correspondence; The plurality of first ends of the transceiver switching switch are respectively connected to the second ends of the plurality of second capacitors in a one-to-one correspondence; The filter group includes a plurality of filters, and the input ends of the plurality of filters are respectively connected to the plurality of second ends of the transceiver switching switch in a one-to-one correspondence; the transceiver switching switch is used to control the connection or disconnection of each of the second capacitors and each of the third capacitors with the corresponding filters in the filter group; The plurality of first ends of the antenna switch are respectively connected to the output ends of the plurality of filters in a one-to-one correspondence, and are used to control the connection or disconnection of the plurality of filters with the antenna; The input end of the antenna is respectively connected to the plurality of second ends of the antenna switch, and the antenna is used to transmit a signal; The power amplifier circuit includes a first triode, a fourth inductor, an inter-stage matching circuit, a second triode, a fifth inductor and two bias circuits; The base of the first transistor serves as the input end of the power amplifier circuit, and the emitter of the first transistor is grounded; A first end of the fourth inductor is connected to an operating voltage, and a second end of the fourth inductor is connected to a collector of the first transistor; The input end of the inter-stage matching circuit is connected to the collector of the first transistor; The base of the second transistor is connected to the output end of the inter-stage matching circuit, the emitter of the second transistor is grounded, and the collector of the second transistor serves as the output end of the power amplifier circuit; A first end of a fifth inductor is connected to an operating voltage, and a second end of the fifth inductor is connected to a collector of the second transistor; The output ends of the two bias circuits are connected to the base of the first transistor and the base of the second transistor respectively.

2. The radio frequency transceiver circuit according to claim 1, characterized in that: The radio frequency transceiver circuit further includes a fourth capacitor, a first end of the fourth capacitor is connected to the output end of the input matching circuit, and a second end of the fourth capacitor is connected to the input end of the power amplifier circuit.

3. The radio frequency transceiver circuit according to claim 1, characterized in that: The power amplifier circuit further includes a fifth capacitor, a first end of the fifth capacitor is connected to the output end of the inter-stage matching circuit, and a second end of the fifth capacitor is connected to the base of the second transistor.

4. The radio frequency transceiver circuit according to claim 3, characterized in that: The two bias circuits have the same structure, and each bias circuit includes a sixth inductor, a third transistor, a fourth transistor, a sixth capacitor, a seventh inductor, a fifth transistor, and an eighth inductor; The first end of the sixth inductor is connected to the adjustment voltage; The collector of the third triode is connected to the second end of the sixth inductor and the base of the third triode respectively; The collector of the fourth triode is connected to the emitter of the third triode and the base of the fourth triode respectively, and the emitter of the fourth triode is grounded; The first end of the sixth capacitor is connected to the base of the third transistor; The first end of the seventh inductor is connected to the second end of the sixth capacitor, and the second end of the seventh inductor is grounded; The base of the fifth transistor is connected to the base of the third transistor, and the collector of the fifth transistor is connected to the power supply voltage; A first end of the eighth inductor is connected to the emitter of the fifth transistor, and a second end of the eighth inductor serves as an output end of the bias circuit.

5. The radio frequency transceiver circuit according to claim 1, characterized in that: The transceiver switching switch includes multiple single-pole single-throw switches; the first ends of the multiple single-pole single-throw switches are respectively used as multiple first ends of the transceiver switching switch, and the second ends of the multiple single-pole single-throw switches are respectively used as multiple second ends of the transceiver switching switch.

Images