Double-channel operational amplifier circuit

An operational amplifier and dual-channel technology, applied to amplifiers with multiple amplifying elements, etc., can solve problems such as large current consumption and inability to share current

Inactive Publication Date: 2011-08-03
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to full-voltage operation, the first output stage 212 and the second output stage 222 cannot share current, and the first gain stage 214 and the second gain stage 224 cannot share current, which will result in a large current consumption

Method used

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  • Double-channel operational amplifier circuit

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Embodiment Construction

[0013] The present invention proposes a dual-channel operational amplifier circuit. By making the data of different polarities of a single output node be processed by the same input stage and gain stage, the problem of abnormal display can be avoided, and the dual-channel operation can be achieved by switching the switch. The amplifier circuit operates in the half-voltage operation mode, so the current consumption can be saved.

[0014] Please refer to image 3 , which shows a schematic diagram of a dual-channel operational amplifier circuit according to a preferred embodiment of the present invention. The dual-channel operational amplifier circuit 300 includes a first operational amplifier and a second operational amplifier. The first operational amplifier has a first input stage 312 , a first gain stage 314 and a first output stage 316 . The second operational amplifier has a second input stage 322 , a second gain stage 324 and a second output stage 326 . The dual-channel...

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Abstract

The invention relates to a double-channel operational amplifier circuit which comprises a first operational amplifier and a second operational amplifier. The second operational amplifier and the first operational amplifier are operated under a half-voltage operation mode; in a first frame of time interval, the double-channel operation amplifier switches operation voltage ranges of a first input level, a first gain level and a first output level to be between a working voltage and a half-working-voltage and switches operation voltage ranges of a second input level, a second gain level and a second output level to be between the half-working-voltage and a grounding level; in the second frame of time interval, the double-channel operational amplifier switches the operation voltage range of the second input level and the second gain level to be between the working voltage and the half-working-voltage and switches the operation voltage ranges of the first input level and the first gain level between the half-working-voltage and the grounding voltage.

Description

technical field [0001] The invention relates to a dual-channel operational amplifier circuit, and in particular to a dual-channel operational amplifier circuit with low power consumption and avoiding abnormal display. Background technique [0002] Operational amplifiers in conventional source drivers can be classified as operating in a half-voltage operation mode or a full-voltage operation mode. Please refer to figure 1 , which shows a schematic diagram of a conventional operational amplifier circuit in half-voltage operation mode. Based on the polarity switching requirements of the liquid crystal display, the operational amplifier circuit 100 needs to output data with different polarities to the nodes N1 and N2 during different frame periods. In a first frame period FP1, the positive polarity data PS is output to the node N1 through a first input stage 112, a first gain stage 114 and a first output stage 116, and the negative polarity data NS is passed through a second i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/42
Inventor 黄如琳苏嘉伟曾柏瑜
Owner NOVATEK MICROELECTRONICS CORP
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