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A power amplifier gain switching circuit

A power amplifier and gain switching technology, applied in gain control, amplification control, electrical components, etc., can solve the problems of excessive chip area and small gap between high and low gain, and achieve the effect of saving chip area

Active Publication Date: 2019-03-15
晋江三伍微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to provide a gain switching circuit of a power amplifier, which solves the problems of the traditional gain switching method such as too large chip area and small gap between high and low gain.

Method used

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  • A power amplifier gain switching circuit
  • A power amplifier gain switching circuit
  • A power amplifier gain switching circuit

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the traditional power amplifier includes an input signal, a first-stage amplifier, a second-stage amplifier, and an output signal; the present invention adds three modules of negative feedback circuit, gain control circuit 1 and gain control circuit 2 on the traditional power amplifier .

[0031] By adjusting the negative feedback circuit and the gain control circuit 1 and the gain control circuit 2, the gain switching of the power amplifier is realized.

[0032] further reference figure 2 , the power amplifier includes an input signal, a power tube Q1, a DC blocking capacitor C1, a power tube Q2, a DC blocking capacitor C2, and an output signal; a DC blocking capacitor C1 is connected between the input signal and the base of the power tube Q1, and the DC blocking capacitor C2 is connected between the collector of power transistor Q1 and the base of power transistor Q2, and the emitters of power transistor Q1 and power transistor Q2 are gro...

Embodiment 2

[0041] refer to Figure 6 The difference between this embodiment and Embodiment 1 is that the gain control circuit 1 is a Π-shaped attenuation network connected in series to the base of the power transistor Q1, specifically including: a resistor Rb1 connected in series between the input signal and the DC blocking capacitor C1 , Rb2, Rb4, Rb5, and another resistor Rb3, one end is connected between the resistors Rb1 and Rb2, the other end is connected to the collector of the switch tube Qb1, one end of the resistor Rb6 is connected between the resistors Rb4 and Rb5, and the other end is connected to the switch tube Qb2 The collector and the emitter of the switching tube Qb2 are grounded; by controlling the base voltage of the switching tubes Qb1 and Qb2, the output current of the Π-shaped attenuation network is changed, thereby realizing the gain switching of the amplifier.

[0042] In a Π-shaped or attenuating network, if the input and output impedances are both 50Ω and the att...

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Abstract

The present invention provides a power amplification electric appliance gain switching circuit. a negative feedback circuit and a gain control circuit are added on a power amplification circuit, and the negative feedback circuit and the gain control circuit are regulated to realize the gain switching of the power amplifier. The power amplification electric appliance gain switching circuit provided by the invention solves the problems that the chip area is too large and the high-low gain falling is small in the traditional gain switching method, etc.

Description

technical field [0001] The invention relates to a power amplifier, in particular to a gain switching circuit of the power amplifier. Background technique [0002] The gain mode of the power amplifier has high and low gain, or high, medium and low gain modes, which are generally implemented in the following ways: [0003] Switch between high and low gain modes by switching channels. The disadvantage of this method is that switching the gain may cause phase discontinuity, and the area of ​​the chip is too large. [0004] By adjusting the voltage or current value of the bias circuit, the circuit works under different bias conditions, thereby realizing switching between high and low gain modes. The disadvantage of this method is that the difference between high and low gain is small. [0005] In order to solve the problems caused by these two gain switching methods, it is necessary to design a new circuit structure to realize the gain switching of the power amplifier, and req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20
Inventor 张黎阳赵骞唐东杰聂庆庆傅金
Owner 晋江三伍微电子有限公司
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