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Operational Amplifier

A technology of operational amplifiers and amplifying circuits, which is applied in the field of operational amplifiers, can solve problems such as difficulty in maintaining stable performance of operational amplifiers, and achieve good driving capabilities and stable bias voltages

Active Publication Date: 2017-08-08
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the deep submicron process, the gain of a single-stage operational amplifier is difficult to exceed 70dB, and the traditional bias circuit is very sensitive to changes in power supply voltage, process, and temperature, making it difficult for the operational amplifier to maintain stable performance.

Method used

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Embodiment Construction

[0046] Such as image 3 Shown is the circuit diagram of the overall circuit of the embodiment of the present invention; the operational amplifier of the embodiment of the present invention includes a two-stage amplifier circuit and a bias circuit; as figure 1 Shown, is the circuit diagram of the two-stage amplifier circuit of the embodiment of the present invention, is image 3 The enlarged diagram of the two-stage amplifier circuit in ; such as figure 2 Shown is the circuit diagram of the bias circuit of the embodiment of the present invention, which is image 3 An enlarged view of the bias circuit in .

[0047] The first stage of the two-stage amplifier circuit is a folded cascode amplifier circuit, and the second stage is a push-pull output circuit.

[0048] The folded cascode amplifier circuit includes a differential input circuit and a common gate amplifier circuit. The folded cascode amplifier circuit can provide high gain.

[0049] The differential input circuit i...

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Abstract

The invention discloses an operational amplifier, which includes a two-stage amplifying circuit and a bias circuit. The folded cascode amplifying circuit of the first stage can provide a high gain of more than 90dB for the circuit, and the push-pull output circuit of the second stage has Good drive capability, the bias voltage of the amplifying circuit is provided by the bias circuit using the bandgap reference circuit, which can make the bias voltage of the circuit very stable, and the characteristics of high gain and stable bias can make the circuit of the present invention be applied to high precision closed-loop feedback system.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to an operational amplifier. Background technique [0002] Operational amplifiers are one of the most versatile components in analog circuits and are typically used in closed-loop feedback systems. The higher the open-loop gain of the op amp, the higher the accuracy of the closed-loop system. High-precision closed-loop systems often require the op amp to have a high gain of more than 90dB. In the deep submicron process, the gain of a single-stage operational amplifier is difficult to exceed 70dB, and the traditional bias circuit is very sensitive to changes in power supply voltage, process, and temperature, making it difficult for the operational amplifier to maintain stable performance. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an operational amplifier with high gain and stable bias circuit, which can be used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/26
Inventor 朱红卫赵郁炜
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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