CN-121984457-A - K-band power amplifier

CN121984457ACN 121984457 ACN121984457 ACN 121984457ACN-121984457-A

Abstract

The invention provides a K-band power amplifier which comprises a first matching network, a common-source common-gate power amplifying circuit, a second matching network, a first common-source power amplifying circuit, a third matching network, a second common-source power amplifying circuit and a fourth matching network, wherein the first matching network is used for matching input impedance, the common-source common-gate power amplifying circuit is used for performing first-stage amplification on a radio-frequency input signal, the second matching network is used for performing second-stage amplification on the radio-frequency input signal, the third matching network is used for performing third-stage amplification on the radio-frequency input signal, and the fourth matching network is used for performing output impedance matching. The K-band power amplifier provided by the invention adopts the common-source common-gate power amplifying circuit as the first-stage driving amplification, has the advantages of high gain and high linearity, and can effectively improve the performance of a radio frequency front-end system.

Inventors

KANG HONGYI
ZHOU JINGYU
WU HAOTIAN
GUO ZICHEN
WANG ZHIYU
MO JIONGJIONG
YU FAXIN

Assignees

浙江大学

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (12)

1. A K-band power amplifier, the K-band power amplifier comprising at least: The common-source common-gate power amplification circuit, the first common-source power amplification circuit, the second common-source power amplification circuit, the first matching network, the second matching network, the third matching network and the fourth matching network; The first matching network receives a radio frequency input signal, and the output end of the first matching network is connected with the input end of the common-source common-gate power amplifying circuit and is used for matching input impedance; the cascode power amplifying circuit amplifies the radio frequency input signal for the first stage; The second matching network is connected between the output end of the common-source common-gate power amplifying circuit and the input end of the first common-source power amplifying circuit and is used for realizing impedance matching between the common-source common-gate power amplifying circuit and the first common-source power amplifying circuit; the first common source power amplifying circuit performs second-stage amplification on the radio frequency input signal; the third matching network is connected between the output end of the first common-source power amplifying circuit and the input end of the second common-source power amplifying circuit and is used for realizing impedance matching between the first common-source power amplifying circuit and the second common-source power amplifying circuit; The second common source power amplifying circuit performs third-stage amplification on the radio frequency input signal; the fourth matching network is connected to the output end of the second common source power amplifying circuit and outputs a radio frequency output signal for matching output impedance.
2. The K-band power amplifier of claim 1, wherein the cascode power amplifier circuit comprises a first FET, a first inductor, a second FET, and a stabilizing network; The grid electrode of the first field effect transistor is used as the input end of the common-source common-grid power amplifying circuit, the source electrode is grounded, and the drain electrode is connected with the source electrode of the second field effect transistor through the first inductor; and the grid electrode of the second field effect transistor is connected with the stabilizing network, and the drain electrode is used as the output end of the common-source common-grid power amplifying circuit.
3. The K-band power amplifier of claim 2, wherein the stabilizing network comprises a first resistor and a first capacitor; One end of the first resistor is connected with the grid electrode of the second field effect tube, the second end of the first resistor is connected with the first power supply port, and one end of the first capacitor is connected with the second end of the first resistor while the other end is grounded.
4. The K-band power amplifier of claim 1, wherein the first matching network comprises a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a second inductor, a third inductor, a fourth inductor, a first source impedance control network and a first harmonic control network; The first end of the second capacitor is used as an input end of the first matching network, the second end of the second capacitor is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is grounded, the second inductor is connected in parallel with the two ends of the third capacitor, the first end of the third inductor is connected with the second end of the third capacitor, the second end of the third inductor is connected with the first end of the fourth inductor, the second end of the fourth inductor is connected with a second power supply port and the first end of the fifth capacitor, and the second end of the fifth capacitor is grounded; the first end of the first source impedance control network is connected with the second end of the third inductor, and the second end is used as the output end of the first matching network; One end of the first harmonic control network is connected with the second end of the first source impedance control network, and the other end of the first harmonic control network is grounded.
5. The K-band power amplifier of claim 1, wherein the first common-source power amplifier circuit comprises a third field-effect transistor, a gate of the third field-effect transistor is used as an input end of the first common-source power amplifier circuit, a source of the third field-effect transistor is grounded, and a drain of the third field-effect transistor is used as an output end of the first common-source power amplifier circuit.
6. The K-band power amplifier of claim 1, wherein the second matching network comprises a fifth inductor, a sixth inductor, a seventh inductor, an eighth inductor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a second source impedance control network, and a second harmonic control network; The first end of the fifth inductor is used as an input end of the second matching network; the first end of the seventh capacitor is connected with the second end of the fifth inductor, the second end of the seventh capacitor is connected with the second end of the seventh inductor, the second end of the eighth capacitor is connected with the fourth power supply port, and one end of the eighth capacitor is connected with the second end of the eighth inductor, and the other end of the eighth capacitor is grounded; The first end of the second source impedance control network is connected with the second end of the seventh inductor, and the second end is used as the output end of the second matching network; one end of the second harmonic control network is connected with the second end of the second source impedance control network, and the other end of the second harmonic control network is grounded.
7. The K-band power amplifier of claim 1, wherein the second common-source power amplifying circuit comprises two parallel common-source power amplifying units, each common-source power amplifying unit comprises a field-effect transistor, wherein, The grid electrode of the fourth field effect transistor is used as a first input end of the second common source power amplifying circuit, the source electrode is grounded, and the drain electrode is used as a first output end of the second common source power amplifying circuit; the grid electrode of the fifth field effect transistor is used as a second input end of the second common source electrode power amplifying circuit, the source electrode is grounded, and the drain electrode is used as a second output end of the second common source electrode power amplifying circuit.
8. The K-band power amplifier of claim 7, wherein the third matching network comprises a ninth inductor, a tenth inductor, an eleventh inductor, a twelfth inductor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a third source impedance control network, a fourth source impedance control network, a third harmonic control network, and a fourth harmonic control network; the first end of the ninth inductor is used as an input end of the third matching network, the first end of the tenth inductor is connected with the second end of the ninth inductor, the second end of the tenth inductor is connected with a fifth power supply port, one end of the ninth capacitor is connected with the second end of the tenth inductor, the other end of the ninth capacitor is grounded, the first end of the tenth capacitor is connected with the second end of the ninth inductor, the second end of the eleventh inductor is connected with a sixth power supply port, one end of the eleventh capacitor is connected with the second end of the eleventh inductor, the other end of the eleventh capacitor is grounded, the first end of the twelfth inductor is connected with the second end of the tenth capacitor, the second end of the twelfth capacitor is connected with the sixth power supply port, and one end of the twelfth capacitor is connected with the second end of the twelfth inductor, and the other end of the twelfth capacitor is grounded; The first end of the third source impedance control network is connected with the second end of the tenth capacitor, and the second end is used as the first output end of the third matching network; The first end of the fourth source impedance control network is connected with the second end of the tenth capacitor, the second end is used as the second output end of the third matching network, one end of the fourth harmonic control network is connected with the second end of the fourth source impedance control network, and the other end of the fourth harmonic control network is grounded.
9. The K-band power amplifier of claim 7, wherein the fourth matching network comprises a thirteenth inductor, a fourteenth inductor, a fifteenth inductor, a sixteenth inductor, a seventeenth inductor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a sixteenth capacitor; The first end of the thirteenth inductor is used as a first input end of the fourth matching network, the first end of the fourteenth inductor is connected with the second end of the thirteenth inductor, the second end of the thirteenth inductor is connected with a seventh power supply port, one end of the thirteenth capacitor is connected with the second end of the fourteenth inductor, and the other end of the thirteenth capacitor is grounded; The first end of the sixteenth inductor is connected with the second end of the fifteenth inductor, the second end of the sixteenth inductor is connected with the seventh power supply port, one end of the fourteenth capacitor is connected with the second end of the sixteenth inductor, and the other end of the fourteenth capacitor is grounded; The first end of the seventeenth inductor is connected with the second ends of the thirteenth inductor and the fifteenth inductor, the second end of the seventeenth inductor is connected with the first end of the fifteenth capacitor, the second end of the fifteenth capacitor is grounded, one end of the sixteenth capacitor is connected with the second end of the seventeenth inductor, and the other end of the sixteenth capacitor is used as the output end of the fourth matching network.
10. The K-band power amplifier of claim 4, 6 or 8, wherein each source impedance control network comprises a second resistor and a seventeenth capacitor connected in parallel.
11. The K-band power amplifier as set out in claim 4, 6 or 8, wherein each harmonic control network comprises an eighteenth inductor and an eighteenth capacitor in series.
12. The K-band power amplifier of claim 2,5 or 7, wherein each FET is a pHEMT FET.

Description

K-band power amplifier Technical Field The invention relates to the field of semiconductor and radio frequency power amplifiers, in particular to a K-band power amplifier. Background The linearity performance of the power amplifier, which is an important component in the radio frequency front-end system, has a crucial influence on the distortion degree of the transmitted signal. The new generation satellite communication system has higher communication rate and higher order modulation mode, so that the linearity of the power amplifier is more severely required. The amplification circuit of the cascode structure can provide high linearity, but because of the low output power caused by the inconsistent source-drain voltage swings of the cascode and cascode transistors, the structure is typically used in low noise amplifier designs, and rarely in power amplifier designs. The traditional high-linearity power amplifier design adopts an analog predistortion structure, but the analog predistortion structure can introduce insertion loss, and the overall gain of the amplifier is reduced. Therefore, how to improve the linearity of the power amplifier while ensuring the overall gain of the power amplifier has become one of the problems to be solved by those skilled in the art. It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present invention and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the invention section. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a K-band power amplifier, which is used for solving the problem that the gain and linearity of the power amplifier cannot be simultaneously balanced in the prior art. To achieve the above and other related objects, the present invention provides a K-band power amplifier, including at least: The common-source common-gate power amplification circuit, the first common-source power amplification circuit, the second common-source power amplification circuit, the first matching network, the second matching network, the third matching network and the fourth matching network; The first matching network receives a radio frequency input signal, and the output end of the first matching network is connected with the input end of the common-source common-gate power amplifying circuit and is used for matching input impedance; the cascode power amplifying circuit amplifies the radio frequency input signal for the first stage; The second matching network is connected between the output end of the common-source common-gate power amplifying circuit and the input end of the first common-source power amplifying circuit and is used for realizing impedance matching between the common-source common-gate power amplifying circuit and the first common-source power amplifying circuit; the first common source power amplifying circuit performs second-stage amplification on the radio frequency input signal; the third matching network is connected between the output end of the first common-source power amplifying circuit and the input end of the second common-source power amplifying circuit and is used for realizing impedance matching between the first common-source power amplifying circuit and the second common-source power amplifying circuit; The second common source power amplifying circuit performs third-stage amplification on the radio frequency input signal; the fourth matching network is connected to the output end of the second common source power amplifying circuit and outputs a radio frequency output signal for matching output impedance. Optionally, the cascode power amplifying circuit includes a first field effect transistor, a first inductor, a second field effect transistor, and a stabilizing network; The grid electrode of the first field effect transistor is used as the input end of the common-source common-grid power amplifying circuit, the source electrode is grounded, and the drain electrode is connected with the source electrode of the second field effect transistor through the first inductor; and the grid electrode of the second field effect transistor is connected with the stabilizing network, and the drain electrode is used as the output end of the common-source common-grid power amplifying circuit. More optionally, the stabilizing network includes a first resistor and a first capacitor; One end of the first resistor is connected with the grid electrode of the second field effect tube, the second end of the first resistor is connected with the first power supply port, and one end of the first capacitor is connected with the second end of the first resistor while the other end is grounde