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Operation amplifier driving circuit for eliminating the operational amplifier offset voltage

A technology of operational amplifiers and offset voltages, applied in differential amplifiers, DC-coupled DC amplifiers, instruments, etc., can solve problems such as unsatisfactory effects and impact on response speed

Inactive Publication Date: 2007-10-24
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, the above technology requires the input voltage to directly charge the capacitor, so the driving capability of the input signal needs to be sufficient to achieve
When the driving ability of the input signal is not enough, the effect of the above technique will not be ideal and will affect the response speed

Method used

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  • Operation amplifier driving circuit for eliminating the operational amplifier offset voltage
  • Operation amplifier driving circuit for eliminating the operational amplifier offset voltage
  • Operation amplifier driving circuit for eliminating the operational amplifier offset voltage

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Embodiment Construction

[0048] The operational amplifier driving circuit for eliminating the offset voltage of the operational amplifier of the present invention will be described in detail below with reference to the accompanying drawings.

[0049]The pins of the positive input terminal and the negative input terminal of the general operational amplifier are fixed and cannot be exchanged. However, an operational amplifier with a chopper can control the pins of the positive input terminal and the negative input terminal by switching signals. 2A and 2B show circuit diagrams of operational amplifiers with choppers with different pins. As shown in FIGS. 2A and 2B, the operational amplifier 20 with a chopper includes four transistors 211, 212, 213, 214, an output amplifier stage (Output Gain Stage) 22, and a current source 23 in addition to a general operational amplifier. , also includes four switches SW21, SW22, SW23 and SW24. Transistors 211, 212 are connected in series, and transistors 213, 214 are...

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Abstract

An operation amplifier drive circuit for eliminating the bias voltage of operation amplifier comprises an operation amplifier with a chopper, a first input, a second input and an output, a first switch for receiving an input voltage to be connected to the first input of the operation amplifier, a second switch connected with the first input and the output of the operation amplifier, a third switch connected with the second input and the output of the operation amplifier, and a capacitor connected with the second input of the operation amplifier. The output of the operation amplifier directly discharges and charges the capacitor, and the polarities of the first and the second inputs of the operation amplifier can be exchanged, therefore, the drive circuit can avoid improving the drive ability of input signal, shorten the discharge / charge time of capacitor and eliminate bias voltage.

Description

technical field [0001] The invention relates to an operational amplifier drive circuit, in particular to an operational amplifier drive circuit for eliminating the offset voltage of the operational amplifier. Background technique [0002] Generally, the output voltage of a source driver (Source Driver) of a thin film transistor liquid crystal display (Thin Film Transistor liquid crystal display, TFT-LCD) is driven by an operational amplifier (Operational Amplifier). Therefore, the offset voltage of the operational amplifier will affect the output voltage of the source driver. The operational amplifiers will have different offset voltages output by each operational amplifier due to the manufacturing process, thereby affecting the color quality of the liquid crystal display. Therefore, eliminating the offset voltage is a problem that the source driver must solve. [0003] FIG. 1A is an operational amplifier driving circuit for eliminating offset voltage of an operational amp...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/20H03F3/45G02F1/133
Inventor 林崑宗
Owner SUNPLUS TECH CO LTD
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