Gain Enhanced Operational Amplifier Suitable for TFT-LCD Driving Circuit

Abstract

The invention relates to large-scale integrated circuits, and aims to boost input transconductance and output resistance of an amplifier, further improve direct current gain of the amplifier and finally realize boost of direct current gain and gain bandwidth product of the amplifier under the condition of same chip area. Therefore, the technical scheme of the invention is a gain-boosted operational amplifier applicable to a TFT-LCD drive circuit. The gain-boosted operational amplifier applicable to the TFT-LCD drive circuit is composed of a Recycling folded cascade amplification stage, an output resistance boosting loop, a transconductance boosting loop and a high swing output stage; differential mode signals Vin- and Vin+ are input through the Recycling folded cascade amplification stage, then, the signals are subjected to the cross positive feedback effect of the output resistance boosting loop stage and the transconductance boosting loop stage and further subjected to current multiplication of a cascade current mirror, and finally, the signals are output to an output end through the high swing output stage. The gain-boosted operational amplifier applicable to the TFT-LCD drive circuit is mainly applied to the large-scale integrated circuits.

Description

technical field [0001] The invention relates to a large-scale integrated circuit, a low-voltage low-power consumption circuit, a TFT-LCD drive circuit, and an operational amplifier, specifically, a low-power gain-enhanced operational amplifier suitable for the TFT-LCD drive circuit. Background technique [0002] Low-voltage, low-power, high-gain, and large-bandwidth operational amplifiers have always been an active research field for low-power analog circuits. Gain enhancement techniques of many high-gain single-stage operational amplifiers can be widely used in portable electronic equipment, such as: TFT-LCD drive circuits, power management and other equipment. Because traditional high-gain amplifiers are limited by the number of gain stages and compensation capacitors, increasing bandwidth and DC gain are contradictory and at the same time at the expense of power consumption. Reducing power consumption and increasing gain without sacrificing die area is a hot area of ​​re...

AI Technical Summary

Problems solved by technology

Many multi-stage high-gain amplifiers rely on increasing the number of gain stages, which increases power consumption, but also leads to larger compensation capacitors, which ultimately increases the chip area.

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