Low-power channel operational amplifier circuit and control method of operational amplifier

Abstract

The invention discloses a channel operational amplifier circuit with low power consumption, which comprises an input stage circuit, an output stage circuit, a voltage adjustment circuit and a detection circuit. The output stage circuit includes first and second transistors. The first and second transistors are connected in series between the working voltage and the ground voltage. The input stage circuit is coupled to the gates of the first and second transistors, receives the input voltage and the output voltage and outputs the first and second gate control voltages to the gates of the first and second transistors. The voltage adjustment circuit includes third and fourth transistors. The third transistor is coupled between the working voltage and the second gate control voltage. The fourth transistor is coupled between the first gate control voltage and the ground voltage. The detection circuit detects the input voltage and the output voltage and selectively controls the operation of the third and fourth transistors to adjust the first or second gate control voltage. The invention provides a low-power channel operational amplifier circuit, which can effectively reduce the steady-state current and save power consumption.

Description

technical field [0001] The present invention is related to operational amplifiers, in particular to a channel operational amplifier (CHOP) circuit and a control method for operational amplifiers that can effectively reduce steady current (Steadycurrent) to save power consumption (Power consumption). Background technique [0002] Please refer to figure 1 , figure 1 A schematic diagram of a conventional one-channel operational amplifier circuit is shown. Such as figure 1 As shown, the traditional channel operational amplifier circuit 1 includes an input stage (Input stage) circuit INS and an output stage (Output stage) circuit OS. The input stage circuit INS includes a differential operational amplifier OP. The output stage circuit OS includes two driving transistors: a first transistor M1 and a second transistor M2. The first transistor M1 and the second transistor M2 are connected in series between the operating voltage AVDD and the ground voltage GND. The junction bet...

AI Technical Summary

Problems solved by technology

However, once the width of the first transistor M1 increases, the steady-state current I1 flowing through the first transistor M1 in a steady state will correspondingly increase, resulting in increased power consumption, which needs to be improved urgently.

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