Dual-frequency power amplifier circuit

Abstract

The invention belongs to the technical field of radio frequency integrated circuits, and discloses a dual-frequency power amplifier circuit. Comprising an input port, a broadband input switch circuit, a C-band and X-band input matching circuit, a C-band and X-band first-stage amplification circuit, a C-band and X-band first-stage and second-stage matching circuit, a C-band and X-band second-stage amplification circuit, a C-band and X-band output matching circuit, a C-band and X-band output switch circuit and an output port. The broadband input switch circuit enables input power to pass through the C-band and X-band input matching circuit and the first-stage and second-stage inter-stage matching circuit, loss of a matching link is reduced, power amplification is achieved through amplification of the first-stage amplifying circuit and the second-stage amplifying circuit of the C-band and the X-band, and the power utilization rate is improved. A series LC structure and a parallel LC structure are added into output matching circuits of the C wave band and the X wave band to achieve optimal efficiency matching, meanwhile, harmonic waves can be effectively restrained, and the efficiency of the whole amplifier is jointly improved.

Description

Technical Field

[0001] This invention belongs to the field of radio frequency integrated circuit technology, and specifically relates to a dual-frequency power amplifier circuit. Background Technology

[0002] With the development of modern wireless communication, radar, and electronic countermeasures systems towards multi-band, multi-standard, and software-defined architectures, higher demands are placed on power amplifiers in the RF front-end. These amplifiers not only need to achieve high output power and high efficiency across multiple discrete frequency points but also possess excellent harmonic suppression capabilities to meet stringent spectral masking requirements and reduce interference to adjacent channels. To achieve the function of a single power amplifier covering multiple frequency bands, researchers both domestically and internationally have proposed various technical solutions, including broadband / ultra-wideband power amplifiers, frequency-reconfigurable power amplifiers, and parallel switching structures for multiple power amplifiers. However, existing technical solutions cannot simultaneously achieve the performance requirements of multi-band, high efficiency, high harmonic suppression, and high integration in high-power applications: broadband solutions have poor efficiency and harmonic suppression; frequency-reconfigurable solutions are limited by switching performance; and traditional parallel multi-power amplifier solutions are hampered by the load effect caused by non-operating power amplifiers. Therefore, there is an urgent need for a power amplifier circuit structure that can fundamentally solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a high-performance, multi-band, high-efficiency, and high harmonic suppression dual-frequency power amplifier circuit.

[0004] One aspect of the present invention provides a dual-band power amplifier circuit, including an input port, a broadband input switch circuit, a C-band and X-band input matching circuit, a C-band and X-band first-stage amplifier circuit, a C-band and X-band first-stage and second-stage inter-stage matching circuit, a C-band and X-band second-stage amplifier circuit, a C-band and X-band output matching circuit, a C-band and X-band output switch circuit, and an output port; The input port is divided into two input ports, C-band and X-band, via a broadband input switching circuit. Each input port is connected to one end of the C-band and X-band input matching circuits, respectively. The other ends of the C-band and X-band input matching circuits are connected to the input terminals of the first-stage amplifier circuits of the C-band and X-band, respectively. The output terminals of the first-stage amplifier circuits of the C-band and X-band are connected to one end of the inter-stage matching circuits between the first and second stages of the C-band and X-band amplifier circuits, respectively. The other ends of the inter-stage matching circuits between the first and second stages of the C-band and X-band amplifier circuits are connected to the input terminals of the second-stage amplifier circuits of the C-band and X-band amplifier circuits, respectively. The output terminals of the second-stage amplifier circuits of the C-band and X-band are connected to one end of the output matching circuits of the C-band and X-band amplifier circuits, respectively. The other ends of the C-band and X-band output switching circuits are combined and then connected to the output port.

[0005] According to the dual-frequency power amplifier circuit of the present invention described above, high performance, multi-band, high efficiency and high harmonic suppression can be achieved. Attached Figure Description

[0006] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a schematic diagram of the structure of a dual-frequency power amplifier circuit according to an embodiment of the present invention. Detailed Implementation

[0007] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0008] An embodiment of the present invention provides a dual-band power amplifier circuit, including an input port, a wideband input switch circuit, a C-band and X-band input matching circuit, a C-band and X-band first-stage amplifier circuit, a C-band and X-band first-stage and second-stage inter-stage matching circuit, a C-band and X-band second-stage amplifier circuit, a C-band and X-band output matching circuit, a C-band and X-band output switch circuit, and an output port.

[0009] The input port is divided into two input ports, C-band and X-band, via a broadband input switching circuit. Each input port is connected to one end of the C-band and X-band input matching circuits, respectively. The other end of the C-band and X-band input matching circuits is connected to the input terminals of the first-stage amplifier circuits of the C-band and X-band, respectively. The output terminals of the first-stage amplifier circuits of the C-band and X-band are connected to one end of the inter-stage matching circuits between the first and second stages of the C-band and X-band amplifier circuits, respectively. The other end of the inter-stage matching circuits between the first and second stages of the C-band and X-band amplifier circuits is connected to the input terminals of the second-stage amplifier circuits of the C-band and X-band amplifier circuits, respectively. The output terminals of the second-stage amplifier circuits of the C-band and X-band are connected to one end of the output matching circuits of the C-band and X-band amplifier circuits, respectively. The other end of the output matching circuits of the C-band and X-band are connected to one end of the output switching circuits of the C-band and X-band amplifier circuits, respectively. The other ends of the output switching circuits of the C-band and X-band are combined and then connected to the output port.

[0010] Figure 1 This is a schematic diagram of a dual-frequency power amplifier circuit according to an embodiment of the present invention. Figure 1 As shown, the broadband input switching circuit includes two switching transistors (first switching transistor SW1 and second switching transistor SW2), two capacitors (first capacitor C1 and second capacitor C2), three inductors (first inductor L1 to third inductor L3), two resistors (first resistor R1 and second resistor R2), and two microstrip lines (first microstrip line TL1 and second microstrip line TL2). Specifically, the input port RFin is connected to the first terminal of the first capacitor C1, the second terminal of C1 is connected to the first terminal of the first inductor L1, the second terminal of the first inductor L1 is connected to the first terminal of the second inductor L2, the third inductor L3, and the second capacitor C2, the other terminal of the second capacitor C2 is grounded, the second terminal of the second inductor L2 is connected to the first terminal of the first microstrip line TL1 and the first terminal of the first switch SW1, the second terminal of the first microstrip line TL1 is connected to the C-band input port, the second terminal of the first switch SW1 is connected to the first terminal of the first resistor R1, the third terminal of the first switch SW1 is grounded, the second terminal of the first resistor R1 is connected to the first voltage V1, the second terminal of the third inductor L3 is connected to the first terminal of the second microstrip line TL2 and the second switch SW2, the second terminal of the second microstrip line TL2 is connected to the X-band input port, the second terminal of the second switch SW2 is connected to the first terminal of the second resistor R2, the third terminal of the second switch SW2 is grounded, and the second terminal of the second resistor R2 is connected to the second voltage V2.

[0011] exist Figure 1 In the circuit, the first terminal of the first capacitor C1 serves as one end of the broadband input switching circuit, and the second terminals of the first microstrip line TL1 and the second microstrip line TL1 serve as the input terminals of the first stage amplifier circuits of the C-band and X-band, respectively.

[0012] The first-stage amplifier circuit for the C-band includes a first C-band transistor C_M1, and the C-band input matching circuit includes 5 capacitors (first C-band capacitor C_C1 to fifth C_C5), 3 inductors (first C-band inductor C_L1 to third C_L3), and 4 resistors (first C-band resistor C_R1 to fourth C_R4). The first-stage amplifier circuit for the X-band includes a first X-band transistor X_M1, and the X-band input matching circuit includes 4 capacitors (first X-band capacitor X_C1 to fourth X_C4), 2 inductors (first X-band inductor X_L1 and second inductor X_L2), 4 resistors (first X-band resistor X_R1 to fourth X_R4), and 1 microstrip line (first X-band microstrip line X_TL1).

[0013] The C-band input port is connected to the first terminal of the first C-band resistor C_R1. The second terminal of the first C-band resistor C_R1 is connected to the first terminal of the first C-band capacitor C_C1. The second terminal of the first C-band capacitor C_C1 is connected to the first terminal of the first C-band inductor C_L1 and the first terminal of the second C-band capacitor C_C2. The second terminal of the second C-band capacitor C_C2 is grounded. The second terminal of the first C-band inductor C_L1 is connected to the first terminal of the second C-band inductor C_L2 and the first terminal of the third C-band capacitor C_C3. The second terminal of the second C-band inductor C_L2 is grounded. The second terminal of the third C-band capacitor C_C3 is connected to the first terminal of the first C-band inductor C_L1 and the first terminal of the second C-band capacitor C_C3. The first terminals of capacitor C_C5, C-band fourth resistor C_R4, and C-band third inductor C_L3 are connected. The second terminals of C-band fifth capacitor C_C5, C-band fourth resistor C_R4, and C-band first transistor C_M1 are connected. The other terminal of C-band third inductor C_L3 is connected to the first terminal of C-band second resistor C_R2. The second terminal of C-band second resistor C_R2 is connected to the first terminals of C-band fourth capacitor C_C4 and C-band third resistor C_R3. The second terminal of C-band third resistor C_R3 is connected to the C-band gate voltage (Vgc). The second terminal of C-band fourth capacitor C_C4 is grounded.

[0014] The X-band input port is connected to the first terminal of the first X-band resistor X_R1. The second terminal of the first X-band resistor X_R1 is connected to the first terminal of the first X-band capacitor X_C1. The second terminal of the first X-band capacitor X_C1 is connected to the first terminal of the first X-band inductor X_L1 and the first terminal of the second X-band capacitor X_C2. The second terminal of the second X-band capacitor X_C2 is grounded. The second terminal of the first X-band inductor X_L1 is connected to the first terminals of the second X-band inductor X_L2, the fourth X-band capacitor X_C4, and the fourth X-band resistor X_R4. The second terminal of the second X-band inductor X_L2 is... The first terminal of the second resistor X_R2 in the X-band is connected to the first terminal of the third capacitor X_C3 and the third resistor X_R3 in the X-band. The second terminal of the third resistor X_R3 in the X-band is connected to the gate voltage (Vgx) in the X-band. The second terminal of the third capacitor X_C3 in the X-band is grounded. The second terminal of the fourth capacitor X_C4 in the X-band is connected to the second terminal of the fourth resistor X_R4 in the X-band and the first terminal of the first microstrip line X_TL1 in the X-band. The second terminal of the first microstrip line X_TL1 in the X-band is connected to the input terminal of the first transistor X_M1 in the X-band.

[0015] exist Figure 1 In the circuit, the first terminal of the C-band first resistor C_R1 serves as one end of the C-band input matching circuit, the second terminals of the C-band fifth capacitor C_C5 and the C-band fourth resistor C_R4 serve as the other end of the C-band input matching circuit, and the input terminal of the C-band first transistor C_M1 serves as the input terminal of the C-band first-stage amplifier circuit; the first terminal of the X-band first resistor X_R1 serves as one end of the X-band input matching circuit, the second terminal of the X-band first microstrip line X_TL1 serves as the other end of the X-band input matching circuit, and the input terminal of the X-band first transistor X_M1 serves as the input terminal of the X-band first-stage amplifier circuit.

[0016] The second-stage amplifier circuit for the C-band includes a second and a third transistor (C_M2, C_M3) for the C-band, and the second-stage amplifier circuit for the X-band includes a second and a third transistor (X_M2, X_M3) for the X-band. The C-band first and second stage interstage matching circuit includes 6 capacitors (C-band sixth capacitor C_C6 to eleventh capacitor C_C11), 3 resistors (C-band fifth resistor C_R5 to seventh resistor C_R7), 7 inductors (C-band fourth inductor C_L4 to tenth inductor C_L10), and 2 microstrip lines (C-band first microstrip line C_TL1 and second microstrip line C_TL2); the X-band first and second stage interstage matching circuit includes 5 capacitors (X-band fifth capacitor X_C5 to ninth capacitor X_C9), 2 resistors (X-band fifth resistor X_R5 and sixth resistor X_R6), 3 inductors (X-band third inductor X_L3 to fifth inductor X_L5), and 2 microstrip lines (X-band second microstrip line X_TL2 and third microstrip line X_TL3).

[0017] Specifically, the output terminal of the first C-band transistor C_M1 is connected to the first terminal of the fourth C-band inductor C_L4; the second terminal of the fourth C-band inductor C_L4 is connected to the first terminals of the fifth C-band inductor C_L5 and the seventh C-band capacitor C_C7; the second terminal of the fifth C-band inductor C_L5 is connected to the C-band drain voltage (Vdc) and the first terminal of the sixth C-band capacitor C_C6; the second terminal of the sixth C-band capacitor C_C6 is grounded; and the second terminal of the seventh C-band capacitor C_C7 is connected to the eighth C-band capacitor C_C... 8. Connect the first terminal of the sixth inductor C_L6 in the C-band to ground. The second terminal of the eighth capacitor C_C8 in the C-band is grounded. The second terminal of the sixth inductor C_L6 in the C-band is connected to the first terminal of the seventh inductor C_L7 in the C-band, the first terminal of the eighth inductor C_L8 in the C-band, and the first terminal of the ninth capacitor C_C9 in the C-band. The second terminal of the ninth capacitor C_C9 in the C-band is grounded. The second terminal of the seventh inductor C_L7 in the C-band is connected to the first terminal of the first microstrip line C_TL1 in the C-band and the first terminal of the ninth inductor C_L9 in the C-band. The second terminal of the ninth inductor C_L9 is connected to the first terminal of the fifth capacitor C_R5 in the C-band. The second terminal of the fifth resistor C_R5 in the C-band is connected to the first terminal of the sixth capacitor C_R6 in the C-band and the first terminal of the tenth capacitor C_C10 in the C-band. The second terminal of the tenth capacitor C_C10 in the C-band is grounded. The second terminal of the sixth resistor C_R6 in the C-band is connected to the gate voltage (Vgc) in the C-band. The second terminal of the first microstrip line C_TL1 in the C-band is connected to the input terminal of the second transistor C_M2 in the C-band. The eighth... The second terminal of inductor C_L8 is connected to the first terminal of the second microstrip line C_TL2 and the first terminal of the tenth inductor C_L10 in the C-band. The second terminal of the tenth inductor C_L10 in the C-band is connected to the first terminal of the seventh resistor C_R7 in the C-band. The second terminal of the seventh resistor C_R7 in the C-band is connected to the first terminal of the eleventh capacitor C_C11 in the C-band. The second terminal of the eleventh capacitor C_C11 in the C-band is grounded. The second terminal of the second microstrip line C_TL2 in the C-band is connected to the input terminal of the third transistor C_M3 in the C-band.

[0018] Specifically, the output terminal of the first X-band transistor X_M1 is connected to the first terminal of the third X-band inductor X_L3; the second terminal of the third X-band inductor X_L3 is connected to the first terminal of the fourth X-band inductor X_L4 and the first terminal of the sixth X-band capacitor X_C6; the second terminal of the fourth X-band inductor X_L4 is connected to the X-band drain voltage (Vdx) and the first terminal of the fifth X-band capacitor X_C5; the second terminal of the fifth X-band capacitor X_C5 is grounded; the second terminal of the sixth X-band capacitor X_C6 is connected to the first terminal of the seventh X-band capacitor X_C7, the first terminal of the eighth X-band capacitor X_C8, and the first terminal of the second X-band microstrip line X_TL2; the second terminals of the seventh X-band capacitor X_C7 and the eighth X-band capacitor X_C8 are grounded; and the second terminal of the second X-band microstrip line X_TL2 is connected to the first terminal of the fifth X-band inductor X_C6. The first terminal of inductor X_L5 is connected to the first terminal of the third microstrip line X_TL3 in the X-band. The second terminal of the fifth inductor X_L5 in the X-band is connected to the first terminal of the fifth resistor X_R5 in the X-band. The second terminal of the fifth resistor X_R5 in the X-band is connected to the first terminal of the sixth resistor X_R6 in the X-band and the ninth capacitor X_C9 in the X-band. The second terminal of the ninth capacitor X_C9 in the X-band is grounded. The second terminal of the sixth resistor X_R6 in the X-band is connected to the X-band gate voltage (Vgx). The second terminal of the third microstrip line X_TL3 in the X-band is connected to the first terminal of the fourth microstrip line X_TL4 in the X-band and the fifth microstrip line X_TL5 in the X-band. The second terminals of the fourth microstrip line X_TL4 in the X-band and the fifth microstrip line X_TL5 in the X-band are respectively connected to the input terminals of the second transistor X_M2 in the X-band and the third transistor X_M3 in the X-band.

[0019] exist Figure 1 In this circuit, the output terminal of the first C-band transistor C_M1 serves as the output terminal of the first stage C-band amplifier circuit; the first terminal of the fourth C-band inductor C_L4 serves as one end of the interstage matching circuit between the first and second stages of the C-band amplifier circuit; the first terminals of the first C-band microstrip line C_TL1 and the second C-band microstrip line C_TL1 serve as the other end of the interstage matching circuit between the first and second stages of the C-band amplifier circuit; and the input terminals of the second C-band transistor C_M2 and the third C-band transistor C_M3 serve as the input terminals of the second stage C-band amplifier circuit.

[0020] The output terminal of the first X-band transistor X_M1 serves as the output terminal of the first stage X-band amplifier circuit. The first terminal of the third X-band inductor X_L3 serves as one end of the interstage matching circuit between the first and second stages of the X-band amplifier circuit. The first terminals of the fourth X-band microstrip line X_TL4 and the fifth X-band microstrip line X_TL5 serve as the other end of the interstage matching circuit between the first and second stages of the X-band amplifier circuit. The input terminals of the second X-band transistor X_M2 and the third X-band transistor X_M3 serve as the input terminals of the second stage X-band amplifier circuit.

[0021] The C-band output matching circuit includes 4 capacitors (C-band 12th capacitor C_C12 to 15th capacitor C_C15), 5 inductors (C-band 11th inductor C_L11 to 15th inductor C_L15), and 3 microstrip lines (C-band 3rd microstrip line C_TL3 to 5th microstrip line C_TL5); the X-band output matching circuit includes 4 capacitors (X-band 10th capacitor X_C10 to 13th capacitor X_C13), 4 inductors (X-band 6th inductor X_L6 to 9th inductor X_L9), and 3 microstrip lines (X-band 6th microstrip line X_TL6 to 8th microstrip line X_TL8).

[0022] Specifically, the output terminals of the second C-band transistor C_M2 and the third C-band transistor C_M3 are connected to the first terminals of the third C-band microstrip line C_TL3 and the fourth C-band microstrip line C_TL4, respectively. The second terminals of the third C-band microstrip line C_TL3 and the fourth C-band microstrip line C_TL4 are connected to the first terminal of the eleventh C-band inductor C_L11. The second terminal of the eleventh C-band inductor C_L11 is connected to the first terminals of the twelfth C-band inductor C_L12, the thirteenth C-band inductor C_L13, and the fourteenth C-band inductor C_L14. The second terminal of the twelfth C-band inductor C_L12 is connected to the C-band drain voltage Vdc and the first terminal of the twelfth C-band capacitor C_C12. The twelfth C-band capacitor C_C12... The second terminal of C12 is grounded. The second terminal of the thirteenth inductor C_L13 of the C-band is connected to the first terminal of the thirteenth capacitor C_C13 of the C-band. The second terminal of the thirteenth capacitor C_C13 of the C-band is grounded. The second terminal of the fourteenth inductor C_L14 of the C-band is connected to the first terminal of the fifteenth inductor C_L15 of the C-band and the fourteenth capacitor C_C14 of the C-band. The second terminals of the fifteenth inductor C_L15 of the C-band and the fourteenth capacitor C_C14 of the C-band are connected to the first terminal of the fifteenth capacitor C_C15 of the C-band. The second terminal of the fifteenth capacitor C_C15 of the C-band is connected to the first terminal of the fifth microstrip line C_TL5 of the C-band. The second terminal of the fifth microstrip line C_TL5 of the C-band is connected to the input terminal of the C-band output switching circuit.

[0023] Specifically, the output terminals of the second X-band transistor X_M2 and the third X-band transistor X_M3 are connected to the first terminals of the sixth X-band microstrip line X_TL6 and the seventh X-band microstrip line X_TL7, respectively. The second terminals of the sixth X-band microstrip line X_TL6 and the seventh X-band microstrip line X_TL7 are connected to the first terminal of the sixth X-band inductor X_L6. The second terminal of the sixth X-band inductor X_L6 is connected to the first terminals of the seventh X-band inductor X_L7, the eighth X-band inductor X_L8, the ninth X-band inductor X_L9, and the twelfth X-band capacitor X_C12. The second terminal of the seventh X-band inductor X_L7 is connected to the tenth X-band capacitor X_C12. The first terminal of capacitor X_C10 is connected to ground. The second terminal of capacitor X_C10 (the tenth capacitor of the X-band) is grounded. The second terminal of capacitor X_L8 (the eighth inductor of the X-band) is connected to the drain voltage Vdx of the X-band and the first terminal of capacitor X_C11 (the eleventh capacitor of the X-band). The second terminal of capacitor X_C11 (the eleventh capacitor of the X-band) is grounded. The second terminals of capacitor X_C12 (the twelfth capacitor of the X-band) and capacitor X_L9 (the ninth inductor of the X-band) are connected to the first terminal of capacitor X_C13 (the thirteenth capacitor of the X-band). The second terminal of capacitor X_C13 (the thirteenth capacitor of the X-band) is connected to the first terminal of microstrip line X_TL8 (the eighth microstrip line of the X-band). The second terminal of microstrip line X_TL8 (the eighth microstrip line of the X-band) is connected to the input terminal of the X-band output switching circuit.

[0024] exist Figure 1 In this circuit, the output terminals of the second C-band transistor C_M2 and the third C-band transistor C_M3 serve as the output terminals of the second-stage C-band amplifier circuit. One end of the third C-band microstrip line C_TL3 and the fourth C-band microstrip line C_TL4 serves as one end of the C-band output matching circuit, and the other end of the fifth C-band microstrip line C_TL5 serves as the other end of the C-band output matching circuit. Furthermore, the third terminal of each of the first C-band transistors C_M1 to the third C-band transistor C_M3, excluding the input and output terminals, is grounded.

[0025] The output terminals of the second X-band transistor X_M2 and the third X-band transistor X_M3 serve as the output terminals of the second-stage X-band amplifier circuit. One end of the sixth X-band microstrip line C_TL6 and the seventh X-band microstrip line C_TL7 serves as one end of the X-band output matching circuit, and the other end of the eighth X-band microstrip line C_TL8 serves as the other end of the X-band output matching circuit. Furthermore, the third terminal of each of the first X-band transistors X_M1 to the third X-band transistor X_M3, excluding the input and output terminals, is grounded.

[0026] The C-band output switching circuit includes the third to fifth C-band switching transistors SW3 to SW5, three resistors (the eighth to tenth C-band resistors C_R8 to C_R10), two inductors (the sixteenth and seventeenth C-band inductors C_L16 and C_L17), one capacitor (the sixteenth C-band capacitor C_C16), and one microstrip line (the sixth C-band microstrip line C_TL16). The X-band output switching circuit includes the sixth switching transistor SW6, one resistor (the seventh X-band resistor X_R7), two inductors (the tenth and eleventh X-band inductors X_L10 and X_L11), one capacitor (the fourteenth X-band capacitor X_C14), the first output capacitor O_C1, and the second output capacitor O_C2.

[0027] In this circuit, the input terminal of the C-band output switch is connected to the first terminal of the third C-band switch transistor SW3, the fourth C-band switch transistor SW4, and the sixth C-band microstrip line C_TL6. The second terminal of the third C-band switch transistor SW3 is grounded. The third terminal of the third C-band switch transistor SW3 is connected to the first terminal of the eighth C-band resistor C_R8. The second terminal of the eighth C-band resistor C_R8 is connected to the first voltage V1 and the first terminal of the ninth C-band resistor C_R9. The second terminal of the ninth C-band resistor C_R9 is connected to the C-band... The first terminal of the fifth switch SW5 is connected to the second terminal of the fourth C-band switch SW4, which is grounded. The third terminal of the fourth C-band switch SW4 is connected to the first terminal of the tenth C-band resistor C_R10. The second terminal of the tenth C-band resistor C_R10 is connected to the first voltage V1. The second terminal of the sixth C-band microstrip line C_TL6 is connected to the sixteenth C-band inductor C_L16, the seventeenth C-band inductor C_L17, and the second terminal of the fifth C-band switch SW5. The third terminal of the fifth C-band switch SW5 is grounded. The second terminal of the sixteenth inductor C_L16 in the C-band is connected to the first terminal of the sixteenth capacitor C_C16 in the C-band. The second terminal of the sixteenth capacitor C_C16 in the C-band is grounded. The second terminal of the seventeenth inductor C_L17 in the C-band is connected to the first output capacitor O_C1, the second output capacitor O_C2, and the first terminal of the fourteenth capacitor X_C14 in the X-band. The second terminal of the first output capacitor O_C1 is grounded. The second terminal of the second output capacitor O_C2 is connected to the output port (RFout).

[0028] In addition, the input terminal of the X-band output switching circuit is connected to the first terminal of the sixth X-band switch transistor SW6, the tenth X-band inductor X_L10, and the eleventh X-band inductor X_L11. The second terminal of the sixth X-band switch transistor SW6 is grounded, the second terminal of the tenth X-band inductor X_L10 is grounded, the third terminal of the sixth X-band switch transistor SW6 is connected to the first terminal of the seventh X-band resistor X_R7, the second terminal of the seventh X-band resistor X_R7 is connected to the second voltage V2, and the second terminal of the eleventh X-band inductor X_L11 is connected to the second terminal of the fourteenth X-band capacitor X_C14.

[0029] In summary, this invention proposes a dual-band power amplifier based on an input / output reconfigurable synthesis network using high-performance GaN HEMT technology. The reconfigurable network not only serves as a frequency band selector but also actively manages and utilizes the load effect introduced by the non-operating power amplifier, transforming it into part of the impedance matching. This completely eliminates performance degradation while further optimizing the performance of the operating power amplifier, providing a solution for the design of high-performance, multi-band RF power amplifiers.

[0030] According to the dual-frequency power amplifier circuit of the above embodiment of the present invention, the power amplifier operates in two frequency bands by switching. The input power is passed through the input matching circuit and the inter-stage matching circuit between the first and second stages by the input switching circuit, which reduces the loss of the matching link. The power is amplified by the first stage amplification circuit and the second stage amplification circuit. The output matching circuit incorporates series LC and parallel LC structures to achieve optimal efficiency matching while effectively suppressing harmonics, thus improving the efficiency of the entire amplifier.

[0031] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dual-frequency power amplifier circuit, characterized in that, It includes an input port, a wideband input switch circuit, a C-band and X-band input matching circuit, a C-band and X-band first-stage amplifier circuit, a C-band and X-band first-stage and second-stage inter-stage matching circuit, a C-band and X-band second-stage amplifier circuit, a C-band and X-band output matching circuit, a C-band and X-band output switch circuit, and an output port; The input port is divided into two input ports, C-band and X-band, via a broadband input switching circuit. Each input port is connected to one end of the C-band and X-band input matching circuits, respectively. The other ends of the C-band and X-band input matching circuits are connected to the input terminals of the first-stage amplifier circuits of the C-band and X-band, respectively. The output terminals of the first-stage amplifier circuits of the C-band and X-band are connected to one end of the inter-stage matching circuits between the first and second stages of the C-band and X-band amplifier circuits, respectively. The other ends of the inter-stage matching circuits between the first and second stages of the C-band and X-band amplifier circuits are connected to the input terminals of the second-stage amplifier circuits of the C-band and X-band amplifier circuits, respectively. The output terminals of the second-stage amplifier circuits of the C-band and X-band are connected to one end of the output matching circuits of the C-band and X-band amplifier circuits, respectively. The other ends of the C-band and X-band output switching circuits are combined and then connected to the output port.

2. The dual-frequency power amplifier circuit according to claim 1, characterized in that, The broadband input switching circuit includes a first switching transistor and a second switching transistor, a first capacitor and a second capacitor, a first inductor to a third inductor, a first resistor and a second resistor, a first microstrip line and a second microstrip line. The input port is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the first end of the first inductor, the second end of the first inductor is connected to the first end of the second inductor, the third inductor and the second capacitor, the other end of the second capacitor is grounded, the second end of the second inductor is connected to the first microstrip line and the first end of the first switching transistor, the second end of the first microstrip line is connected to the C-band input port, the second end of the first switching transistor is connected to the first end of the first resistor, the third end of the first switching transistor is grounded, the second end of the first resistor is connected to the first voltage, the second end of the third inductor is connected to the second microstrip line and the first end of the second switching transistor, the second end of the second microstrip line is connected to the X-band input port, the second end of the second switching transistor is connected to the first end of the second resistor, the third end of the second switching transistor is grounded, and the second end of the second resistor is connected to the second voltage. The first terminal of the first capacitor serves as one end of the broadband input switching circuit, and the second terminals of the first microstrip line and the second microstrip line serve as the input terminals of the first-stage amplifier circuits of the C-band and X-band, respectively.

3. The dual-frequency power amplifier circuit according to claim 2, characterized in that, The C-band first-stage amplifier circuit includes a C-band first transistor, and the C-band input matching circuit includes C-band first to fifth capacitors, C-band first to third inductors, and C-band first to fourth resistors; the X-band first-stage amplifier circuit includes an X-band first transistor, and the X-band input matching circuit includes X-band first to fourth capacitors, X-band first and second inductors, X-band first to fourth resistors, and an X-band first microstrip line; Specifically, the C-band input port is connected to the first end of the first C-band resistor; the second end of the first C-band resistor is connected to the first end of the first C-band capacitor; the second end of the first C-band capacitor is connected to the first end of the first C-band inductor and the first end of the second C-band capacitor; the second end of the second C-band capacitor is grounded; the second end of the first C-band inductor is connected to the first end of the second C-band inductor and the first end of the third C-band capacitor; the second end of the second C-band inductor is grounded; the second end of the third C-band capacitor is connected to the fifth C-band capacitor, the fourth C-band resistor, and the first end of the third C-band inductor; the second end of the fifth C-band capacitor is connected to the second end of the fourth C-band resistor and the input terminal of the first C-band transistor; the other end of the third C-band inductor is connected to the first end of the second C-band resistor; the second end of the second C-band resistor is connected to the first end of the fourth C-band capacitor and the first end of the third C-band resistor; the second end of the third C-band resistor is connected to the C-band gate voltage; and the second end of the fourth C-band capacitor is grounded. The X-band input port is connected to the first terminal of the first X-band resistor. The second terminal of the first X-band resistor is connected to the first terminal of the first X-band capacitor. The second terminal of the first X-band capacitor is connected to the first terminal of the first X-band inductor and the first terminal of the second X-band capacitor. The second terminal of the second X-band capacitor is grounded. The second terminal of the first X-band inductor is connected to the first terminal of the second X-band inductor, the fourth X-band capacitor, and the fourth X-band resistor. The second terminal of the second X-band inductor is connected to the first terminal of the second X-band resistor. The second terminal of the second X-band resistor is connected to the first terminal of the third X-band capacitor and the first terminal of the third X-band resistor. The second terminal of the third X-band resistor is connected to the X-band gate voltage. The second terminal of the third X-band capacitor is grounded. The second terminal of the fourth X-band capacitor is connected to the second terminal of the fourth X-band resistor and the first terminal of the first X-band microstrip line. The second terminal of the first X-band microstrip line is connected to the input terminal of the first X-band transistor. The first terminal of the first resistor in the C-band serves as one end of the C-band input matching circuit, the second terminals of the fifth capacitor and the fourth resistor in the C-band serve as the other end of the C-band input matching circuit, and the input terminal of the first transistor in the C-band serves as the input terminal of the first stage amplifier circuit in the C-band. Similarly, the first terminal of the first resistor in the X-band serves as one end of the X-band input matching circuit, the second terminal of the first microstrip line in the X-band serves as the other end of the X-band input matching circuit, and the input terminal of the first transistor in the X-band serves as the input terminal of the first stage amplifier circuit in the X-band.

4. The dual-frequency power amplifier circuit according to claim 3, characterized in that, The C-band second-stage amplifier circuit includes a C-band second transistor and a third transistor. The C-band first-stage and second-stage interstage matching circuit includes C-band sixth to eleventh capacitors, C-band fifth to seventh resistors, C-band fourth to tenth inductors, and C-band first and second microstrip lines. The X-band second-stage amplifier circuit includes an X-band second transistor and a third transistor. The X-band first-stage and second-stage interstage matching circuit includes X-band fifth to ninth capacitors, X-band fifth and sixth resistors, X-band third to fifth inductors, and X-band second and third microstrip lines. Specifically, the output terminal of the first C-band transistor is connected to the first terminal of the fourth C-band inductor; the second terminal of the fourth C-band inductor is connected to the first terminal of the fifth C-band inductor and the seventh C-band capacitor; the second terminal of the fifth C-band inductor is connected to the drain voltage of the C-band transistor and the first terminal of the sixth C-band capacitor; the second terminal of the sixth C-band capacitor is grounded; the second terminal of the seventh C-band capacitor is connected to the first terminal of the eighth C-band capacitor and the sixth C-band inductor; the second terminal of the eighth C-band capacitor is grounded; the second terminal of the sixth C-band inductor is connected to the first terminals of the seventh C-band inductor, the eighth C-band inductor, and the ninth C-band capacitor; the second terminal of the ninth C-band capacitor is grounded; and the second terminal of the seventh C-band inductor is connected to the first terminal of the first C-band microstrip line and the first terminal of the ninth C-band inductor. The second terminal of the ninth inductor in the C-band is connected to the first terminal of the fifth capacitor in the C-band. The second terminal of the fifth resistor in the C-band is connected to the first terminal of the sixth capacitor in the C-band and the first terminal of the tenth capacitor in the C-band. The second terminal of the tenth capacitor in the C-band is grounded. The second terminal of the sixth resistor in the C-band is connected to the gate voltage in the C-band. The second terminal of the first microstrip line in the C-band is connected to the input terminal of the second transistor in the C-band. The second terminal of the eighth inductor in the C-band is connected to the first terminal of the second microstrip line in the C-band and the first terminal of the tenth inductor in the C-band. The second terminal of the tenth inductor in the C-band is connected to the first terminal of the seventh resistor in the C-band. The second terminal of the seventh resistor in the C-band is connected to the first terminal of the eleventh capacitor in the C-band. The second terminal of the eleventh capacitor in the C-band is grounded. The second terminal of the second microstrip line in the C-band is connected to the input terminal of the third transistor in the C-band. The output terminal of the first X-band transistor is connected to the first terminal of the third X-band inductor. The second terminal of the third X-band inductor is connected to the first terminal of the fourth X-band inductor and the first terminal of the sixth X-band capacitor. The second terminal of the fourth X-band inductor is connected to the drain voltage of the X-band transistor and the first terminal of the fifth X-band capacitor. The second terminal of the fifth X-band capacitor is grounded. The second terminal of the sixth X-band capacitor is connected to the first terminals of the seventh and eighth X-band capacitors and the first terminal of the second X-band microstrip line. The second terminals of the seventh and eighth X-band capacitors are grounded. The second terminal of the second X-band microstrip line is connected to the X-band... The fifth inductor of the X-band is connected to the first end of the third microstrip line of the X-band. The second end of the fifth inductor of the X-band is connected to the first end of the fifth resistor of the X-band. The second end of the fifth resistor of the X-band is connected to the first end of the sixth resistor and the ninth capacitor of the X-band. The second end of the ninth capacitor of the X-band is grounded. The second end of the sixth resistor of the X-band is connected to the gate voltage of the X-band. The second end of the third microstrip line of the X-band is connected to the first end of the fourth microstrip line and the fifth microstrip line of the X-band. The second ends of the fourth microstrip line and the fifth microstrip line of the X-band are respectively connected to the input terminals of the second transistor and the third transistor of the X-band. The output terminal of the first C-band transistor serves as the output terminal of the first stage C-band amplifier circuit; the first terminal of the fourth C-band inductor serves as one end of the interstage matching circuit between the first and second stages of the C-band amplifier circuit; the first terminals of the first and second C-band microstrip lines serve as the other end of the interstage matching circuit between the first and second stages of the C-band amplifier circuit; and the input terminals of the second and third C-band transistors serve as the input terminals of the second stage C-band amplifier circuit. The output terminal of the first X-band transistor serves as the output terminal of the first stage X-band amplifier circuit. The first terminal of the third X-band inductor serves as one end of the interstage matching circuit between the first and second stages of the X-band amplifier circuit. The first terminals of the fourth and fifth X-band microstrip lines serve as the other end of the interstage matching circuit between the first and second stages of the X-band amplifier circuit. The input terminals of the second and third X-band transistors serve as the input terminals of the second stage X-band amplifier circuit.

5. The dual-frequency power amplifier circuit according to claim 4, characterized in that, The C-band output matching circuit includes C-band capacitors 12 to 15, C-band inductors 11 to 15, and C-band microstrip lines 3 to 5; the X-band output matching circuit includes X-band capacitors 10 to 13, X-band inductors 6 to 9, and X-band microstrip lines 6 to 8. Specifically, the output terminals of the second and third C-band transistors are connected to the first terminals of the third and fourth C-band microstrip lines, respectively. The second terminals of the third and fourth C-band microstrip lines are connected to the first terminal of the eleventh C-band inductor. The second terminal of the eleventh C-band inductor is connected to the first terminals of the twelfth, thirteenth, and fourteenth C-band inductors. The second terminal of the twelfth C-band inductor is connected to the drain voltage and the first terminal of the twelfth C-band capacitor. The twelfth C-band capacitor... The second terminal is grounded. The second terminal of the thirteenth inductor of the C-band is connected to the first terminal of the thirteenth capacitor of the C-band. The second terminal of the thirteenth capacitor of the C-band is grounded. The second terminal of the fourteenth inductor of the C-band is connected to the first terminal of the fifteenth inductor and the fourteenth capacitor of the C-band. The second terminals of the fifteenth inductor and the fourteenth capacitor of the C-band are connected to the first terminal of the fifteenth capacitor of the C-band. The second terminal of the fifteenth capacitor of the C-band is connected to the first terminal of the fifth microstrip line of the C-band. The second terminal of the fifth microstrip line of the C-band is connected to the input terminal of the C-band output switching circuit. The output terminals of the second and third X-band transistors are connected to the first terminals of the sixth and seventh X-band microstrip lines, respectively. The second terminals of the sixth and seventh X-band microstrip lines are connected to the first terminal of the sixth X-band inductor. The second terminal of the sixth X-band inductor is connected to the first terminals of the seventh, eighth, ninth, and twelfth X-band capacitors. The second terminal of the seventh X-band inductor is connected to the first terminal of the tenth X-band capacitor. The second terminal of the tenth X-band capacitor is grounded. The second terminal of the eighth X-band inductor is connected to the X-band drain voltage and the first terminal of the eleventh X-band capacitor. The second terminal of the eleventh X-band capacitor is grounded. The second terminals of the twelfth and ninth X-band capacitors are connected to the first terminal of the thirteenth X-band capacitor. The second terminal of the thirteenth X-band capacitor is connected to the first terminal of the eighth X-band microstrip line. The second terminal of the eighth X-band microstrip line is connected to the input terminal of the X-band output switching circuit. The output terminals of the second and third C-band transistors serve as the output terminals of the second-stage C-band amplifier circuit. One end of the third and fourth C-band microstrip lines serves as one end of the C-band output matching circuit, and the other end of the fifth C-band microstrip line serves as the other end of the C-band output matching circuit. The third terminal of each of the first to third C-band transistors, except for the input and output terminals, is grounded. The output terminals of the second and third X-band transistors serve as the output terminals of the second-stage X-band amplifier circuit. One end of the sixth and seventh X-band microstrip lines serves as one end of the X-band output matching circuit, and the other end of the eighth X-band microstrip line serves as the other end of the X-band output matching circuit. The third terminal of each of the first to third X-band transistors, in addition to the input and output terminals, is grounded.

6. The dual-frequency power amplifier circuit according to claim 5, characterized in that, The C-band output switching circuit includes the third to fifth switching transistors, the eighth to tenth C-band resistors, the sixteenth and seventeenth C-band inductors, the sixteenth C-band capacitor, and the sixth C-band microstrip line; the X-band output switching circuit includes the sixth switching transistor, the tenth and eleventh X-band inductors, the seventh X-band resistor, the fourteenth X-band capacitor, the first output capacitor, and the second output capacitor; In this circuit, the input terminal of the C-band output switch is connected to the first terminal of the third and fourth C-band switches and the sixth C-band microstrip line. The second terminal of the third C-band switch is grounded. The third terminal of the third C-band switch is connected to the first terminal of the eighth C-band resistor. The second terminal of the eighth C-band resistor is connected to the first voltage and the first terminal of the ninth C-band resistor. The second terminal of the ninth C-band resistor is connected to the first terminal of the fifth C-band switch. The second terminal of the fourth C-band switch is grounded. The third terminal of the fourth C-band switch is connected to the first terminal of the tenth C-band resistor. The second terminal of the tenth C-band resistor is connected to the first voltage. The second terminal of the sixth C-band microstrip line is connected to the second terminal of the sixteenth and seventeenth C-band inductors and the fifth C-band switch. The third terminal of the fifth C-band switch is grounded. The second terminal of the sixteenth inductor in the C-band is connected to the first terminal of the sixteenth capacitor in the C-band. The second terminal of the sixteenth capacitor in the C-band is grounded. The second terminal of the seventeenth inductor in the C-band is connected to the first terminal of the first output capacitor, the second output capacitor, and the fourteenth capacitor in the X-band. The second terminal of the first output capacitor is grounded. The second terminal of the second output capacitor is connected to the output port. The input terminal of the X-band output switching circuit is connected to the first terminals of the sixth X-band switch, the tenth X-band inductor, and the eleventh X-band inductor. The second terminal of the sixth X-band switch is grounded, the second terminal of the tenth X-band inductor is grounded, the third terminal of the sixth X-band switch is connected to the first terminal of the seventh X-band resistor, the second terminal of the seventh X-band resistor is connected to the second voltage, and the second terminal of the eleventh X-band inductor is connected to the second terminal of the fourteenth X-band capacitor.

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