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Single-stage operational amplifier suitable for TFT-LCD drive circuit

A technology of operational amplifiers and drive circuits, applied in amplifiers with semiconductor devices/discharge tubes, DC-coupled DC amplifiers, amplifiers, etc., can solve the problem of power supply ripple suppression ability decline, high-performance amplifier simulation and test performance drift, Issues such as common mode signal enhancement

Inactive Publication Date: 2016-03-02
TIANJIN UNIV
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Problems solved by technology

Because high-gain amplifiers tend to increase the common-mode signal while amplifying the signal, and reduce the ability to suppress power supply ripple, resulting in simulation and test performance drift of high-performance amplifiers

Method used

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  • Single-stage operational amplifier suitable for TFT-LCD drive circuit

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Embodiment Construction

[0019] The present invention proposes a single-stage operational amplifier with low power consumption, high gain and high PSRR for TFT-LCD driven input gain enhancement and high PSRR enhancement. Based on the original Recycling Folded cascode amplifier, this paper uses a positive feedback loop to enhance the amplifier gain. The power supply ripple is then suppressed by the positive feedback of the output stage of the folded cascode. Finally, under the condition of the same chip area, the DC gain and PSRR of the amplifier are improved.

[0020] The invention proposes a high-gain and high-PSRR single-stage operational amplifier for TFT-LCD driving. The amplifier is composed of a Recyclingfoldedcascode amplification stage, an output resistance enhancement loop, a transconductance enhancement loop and a PSRR enhancement output stage. Recyclingfoldedcascode amplification stage includes input transconductance enhancement stage gm1 and cascode current mirror. The output resistance ...

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Abstract

The invention relates to large-scale integrated circuits, which improves gain and PSRR of an amplifier under a condition of the same chip area and has low power consumption and great capacitive load drive capacity. By adopting the technical scheme provided by the invention, a single-stage operational amplifier suitable for a TFT-LCD drive circuit consists of a recycling folded cascade amplification stage, an output resistance reinforcement loop, a transconductance reinforcement loop and a PSRR reinforcement output state; the recycling folded cascade amplification stage inputs different-mode signals Vin- and Vin+, is subjected to a cross feed and feedback function of the output resistance reinforcement loop stage and the transconductance reinforcement loop stage, and a current multiplication function of a cascade current mirror, and finally passes through the PSRR reinforcement output stage to reach the output end Vout. The single-stage operational amplifier suitable for the TFT-LCD drive circuit is mainly applied to designing and manufacturing 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 driving circuit, a PSRR, and an operational amplifier, and specifically relates to a PSRR-enhanced single-stage operational amplifier suitable for a TFT-LCD driving circuit. Background technique [0002] Low-voltage, low-power, high-gain operational amplifiers have always been an active area of ​​research in low-power analog circuits. The power supply rejection ratio (PSRR) enhancement technology of many high-gain operational amplifiers can be widely used in portable electronic equipment, such as: TFT-LCD drivers, power management and other equipment. Because the high-gain amplifier tends to increase the common-mode signal while amplifying the signal, and the ability to suppress the power supply ripple is reduced, which leads to the simulation and test performance drift of the high-performance amplifier. While improving the gain and bandwi...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/30H03F1/38
CPCH03F1/306H03F1/38H03F3/4543H03F3/45695H03F2203/45028H03F2203/45051
Inventor 肖夏张庚宇
Owner TIANJIN UNIV
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