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

A technology of operational amplifiers and control methods, applied to amplifiers, parts of amplifiers, improved amplifiers to improve efficiency, etc., can solve problems such as increased power consumption and increase power consumption, and achieve the effect of saving power consumption

Active Publication Date: 2022-04-08
APLUS SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment Construction

[0044] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0045] A preferred embodiment of the present invention is a low power channel operational amplifier circuit. In this embodiment, the channel operational amplifier circuit can be applied to the source driving circuit of the display device and coupled to the display panel through the data line to drive the pixels on the display panel, but not limited thereto.

[0046] Please refer to image 3 , image 3 A schematic diagram of the low power channel operational amplifier circuit 3 in this embodiment is shown. Such as image 3 As shown, the channel operational amplifier circuit 3 includes an input stage circuit INS, an output stage circuit OS, a detection circu...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02
CPCH03F1/0211
Inventor 蔡水河郭洲铭
Owner APLUS SEMICON TECH CO LTD
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