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Operational amplifier

An operational amplifier, differential input circuit technology, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as offset voltage, MOS tube mismatch, etc., to improve voltage gain, avoid mismatch errors, eliminate Effects of op amp offset voltage

Inactive Publication Date: 2015-02-25
无锡纳讯微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: Aiming at the problems existing in the prior art, the present invention proposes an operational amplifier, which solves the problem of mismatching of MOS tubes caused by process manufacturing and then affects the offset voltage

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Equivalent transformations all fall within the scope defined by the appended claims of this application.

[0022] Such as figure 2 Opamps shown, including:

[0023] The input stage circuit 201, the input stage circuit 201 includes a mirror circuit 204, a differential input circuit A210, a differential input circuit B211, a bias circuit A212 that provides a bias current for the differential input circuit A210, and a bias circuit that provides a bias current for the differential input circuit B211 Bias circuit B213;

[0024] An output stage circuit 202, the output stage circuit 202...

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Abstract

The invention discloses an operational amplifier which comprises an input stage circuit, an output stage circuit and a difference mode feedback circuit. By use of the operational amplifier, on the premise of not increasing the circuit complexity, the offset voltage of the operational amplifier is eliminated by additionally arranging the difference mode feedback circuit, and the problem that quiescent operating points of an existing operational amplifier drift due to work temperature changes is solved. An input tube of an asymmetric structure is used in the input stage circuit, so that voltage gains of a feedback loop are improved, and meanwhile mismatching errors caused by a traditional input tube of a symmetric structure are avoided.

Description

[0001] technical field [0002] The present invention relates to an operational amplifier, in particular to an operational amplifier for driving capacitive line loads such as liquid crystal display devices. Background technique [0003] Traditionally, bipolar transistors have been used in most cases to construct operational amplifiers. However, with the ongoing requirement for the coexistence of MOS circuits and bipolar transistors and low power operation, it is now more common to construct operational amplifiers using MOS transistors. When constructing an operational amplifier with MOS transistors, the circuit configuration of the operational amplifier differs from that using bipolar transistors by utilizing the inherent mode characteristics of the MOS transistors. Examples of such operational amplifiers include amplifiers using electronic switching functions. [0004] Thin Film Transistor Liquid Crystal Display (TFT LCD) driver LSI is one of the applications where operati...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/30
CPCH03F1/301H03F3/45475H03F3/45973H03F2201/3215H03F2203/45118
Inventor 蒋振雷
Owner 无锡纳讯微电子有限公司
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