Continuous-time Common-Mode Feedback Circuit for High-Speed Fully Differential Operational Amplifiers

An operational amplifier and common-mode feedback technology, applied in the field of continuous-time common-mode feedback circuits, can solve the problems of low common-mode feedback loop gain, large common-mode feedback current, waste, etc., and achieve high common-mode feedback loop gain, The effect of large unity gain bandwidth

CN103354443BActive Publication Date: 2016-08-10HUAQIAO UNIVERSITY

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: HUAQIAO UNIVERSITY
Publication Date: 2016-08-10

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Abstract

The invention provides a CTCMFB circuit applied to a high-speed fully differential operational amplifier. The CTCMFB circuit comprises a common-mode voltage detection circuit, an error amplifier and a common-mode feedback control circuit, wherein the common-mode voltage detection circuit is used for detecting common-mode voltage output by the high-speed fully differential operational amplifier; the error amplifier is used for amplifying a comparison result of the common-mode voltage and expected common-mode voltage; the common-mode feedback control circuit is used for regulating the high-speed fully differential operational amplifier; the high-speed fully differential operational amplifier, the common-mode voltage detection circuit, the error amplifier and the common-mode feedback control circuit are mutually connected; and the error amplifier provides two channels of different output signals for the common-mode feedback control circuit so as to control the output common-mode voltage of the high-speed fully differential operational amplifier. The CTCMFB circuit applied to the high-speed fully differential operational amplifier has the advantages as follows: the structure is simple, the common-mode feedback loop gain is high, and the unity-gain bandwidth is large.

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Description

technical field

[0001] The invention relates to the field of integrated circuit design, in particular to a continuous-time common-mode feedback circuit applied to high-speed fully differential operational amplifiers. Background technique

[0002] The high-speed fully differential operational amplifier has a high output swing and has a good suppression effect on common-mode interference such as environmental noise and power supply voltage noise, and has been widely used. In practical applications, a high-speed fully differential operational amplifier needs a common-mode feedback circuit to control the DC level of each node and output node inside the amplifier, so as to ensure that all transistors of the amplifier work in the saturation region, so that the amplifier can work normally and the output swing reaches best.

[0003] The common-mode feedback circuit is a negative feedback circuit consisting of three parts: a common-mode voltage detection circuit, an error amplifier ...

Claims

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