CN-122026841-A - Circuit system for realizing gain control of gallium arsenide amplifier

Abstract

The invention relates to a circuit system for realizing gain control of a gallium arsenide amplifier, which comprises an amplifier module, an operational amplifier driving circuit and a triode current control circuit, wherein the amplifier module comprises an amplifier U1 and a peripheral circuit thereof, the operational amplifier driving circuit comprises an operational amplifier Q1 and a peripheral circuit thereof, the triode current control circuit comprises a triode Q2 and a peripheral circuit thereof, the output end of the operational amplifier Q1 is connected with the amplifier U1, and the collector electrode of the triode Q2 is connected with the reverse input end of the operational amplifier Q1. The circuit system for realizing the gain control of the gallium arsenide amplifier realizes the control of the large working current of the gallium arsenide amplifier by utilizing a triode circuit and smaller base current, thereby realizing the linear control of the gain of the amplifier.

Inventors

• ZHOU WENBO
• LI JUNGANG
• WU CHUANGCHUANG

Assignees

• 创远信科(上海)技术股份有限公司

Dates

Publication Date

20260512

Application Date

20251215

Claims (4)

1. 1. The circuit system for realizing gain control of the gallium arsenide amplifier is characterized by comprising an amplifier module, an operational amplifier driving circuit and a triode current control circuit, wherein the amplifier module comprises an amplifier U1 and a peripheral circuit thereof, the operational amplifier driving circuit comprises an operational amplifier Q1 and a peripheral circuit thereof, the triode current control circuit comprises a triode Q2 and a peripheral circuit thereof, the output end of the operational amplifier Q1 is connected with the amplifier U1, and the collector electrode of the triode Q2 is connected with the reverse input end of the operational amplifier Q1.
2. 2. The circuit system for implementing gain control of a gallium arsenide amplifier according to claim 1, further comprising a connector P1, wherein the base of the transistor Q2 is connected to the connector P1.
3. 3. The circuit system for implementing gain control of a gallium arsenide amplifier according to claim 1, further comprising a fourth resistor, the emitter of the transistor Q2 being coupled to ground through the fourth resistor.
4. 4. The circuit system for implementing gain control of gallium arsenide amplifier according to claim 1, wherein the triode Q2 inputs voltage to the op-amp Q1, voltage drop is generated on the inverting input terminal of the op-amp Q1, the voltage on the inverting input terminal of the op-amp Q1 is changed, the output voltage of the op-amp Q1 is changed, the conduction degree of the conduction channel of the amplifier U1 is changed, and the gain of the amplifier is changed.

Description

Circuit system for realizing gain control of gallium arsenide amplifier Technical Field The invention relates to the field of radio frequency transmitters, in particular to the field of gallium arsenide amplifiers, and specifically relates to a circuit system for realizing gain control of a gallium arsenide amplifier. Background The 5G technology is more and more varied, and the gallium arsenide amplifier is widely applied to equipment such as radio frequency transmitters and the like due to the advantages of low noise coefficient, large working frequency range and the like. Most gallium arsenide amplifiers in the market use drain bias circuits to provide working current, and gate negative bias control transistors to conduct paths to realize stable operation of the amplifiers. A common gallium arsenide amplifier peripheral simplified circuit is shown in fig. 1. The drain positive bias Vdd provides the amplifier operating current and the gate negative bias Vgg controls the amplifier transistor turn-on path. To protect the amplifier from burn-out, the gate negative bias is powered up earlier than the drain positive bias, and the gate negative bias is powered down later than the drain positive bias. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a circuit system for realizing gain control of a gallium arsenide amplifier, which has the advantages of simple structure, accurate control and wider application range. In order to achieve the above object, the circuit system for realizing gain control of the gallium arsenide amplifier of the present invention is as follows: The circuit system for realizing gain control of the gallium arsenide amplifier is mainly characterized by comprising an amplifier module, an operational amplifier driving circuit and a triode current control circuit, wherein the amplifier module comprises an amplifier U1 and a peripheral circuit thereof, the operational amplifier driving circuit comprises an operational amplifier Q1 and a peripheral circuit thereof, the triode current control circuit comprises a triode Q2 and a peripheral circuit thereof, the output end of the operational amplifier Q1 is connected with the amplifier U1, and the collector electrode of the triode Q2 is connected with the reverse input end of the operational amplifier Q1. Preferably, the system further comprises a connector P1, and the base of the transistor Q2 is connected to the connector P1. Preferably, the system further comprises a fourth resistor, and the emitter of the triode Q2 is grounded through the fourth resistor. Preferably, the triode Q2 inputs voltage to the op-amp Q1, and generates voltage drop to the inverting input terminal of the op-amp Q1, the voltage of the inverting input terminal of the op-amp Q1 changes, and the output voltage of the op-amp Q1 changes, so that the conduction degree of the conducting channel of the amplifier U1 changes, and the gain of the amplifier changes. The circuit system for realizing the gain control of the gallium arsenide amplifier realizes the control of the large working current of the gallium arsenide amplifier by utilizing a triode circuit and smaller base current, thereby realizing the linear control of the gain of the amplifier. Drawings Fig. 1 is a simplified circuit of a conventional gallium arsenide amplifier. Fig. 2 is a circuit diagram of circuitry for implementing gain control of a gallium arsenide amplifier in accordance with the present invention. Detailed Description In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments. The circuit system for realizing gain control of the gallium arsenide amplifier comprises an amplifier module, an operational amplifier driving circuit and a triode current control circuit, wherein the amplifier module comprises an amplifier U1 and a peripheral circuit thereof, the operational amplifier driving circuit comprises an operational amplifier Q1 and a peripheral circuit thereof, the triode current control circuit comprises a triode Q2 and a peripheral circuit thereof, the output end of the operational amplifier Q1 is connected with the amplifier U1, and the collector electrode of the triode Q2 is connected with the reverse input end of the operational amplifier Q1. As a preferred embodiment of the present invention, the system further includes a connector P1, and the base of the transistor Q2 is connected to the connector P1. As a preferred embodiment of the present invention, the system further comprises a fourth resistor, and the emitter of the transistor Q2 is grounded through the fourth resistor. As a preferred embodiment of the present invention, the transistor Q2 inputs a voltage to the op-amp Q1, and generates a voltage drop on the inverting input terminal of the op-amp Q1, the voltage on the inverting input terminal of the op-amp Q1 changes, the output voltage o