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Current multiplexing type feed-forward compensation fully differential operational amplifier

A fully differential amplifier, operational amplifier technology, applied in differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as large current and increase overall circuit power consumption, reduce power consumption, expand bandwidth, and open high and low frequencies. The effect of loop gain

Active Publication Date: 2015-01-14
THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
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  • Abstract
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AI Technical Summary

Problems solved by technology

Since the Miller capacitor is not used, this structure greatly expands the bandwidth of the op amp. However, since the second gain stage and the feedforward stage exist independently, the current consumed by this structure is relatively large, which increases the power consumption of the overall circuit.

Method used

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  • Current multiplexing type feed-forward compensation fully differential operational amplifier

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Embodiment Construction

[0010] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0011] Such as figure 1 As shown, a current multiplexing type feedforward compensation fully differential operational amplifier, which includes a first gain stage, a second gain stage, a feedforward stage and a common-mode feedback circuit, wherein the feedforward stage and the second gain stage are mutual loads And the current is multiplexed, the first gain stage is a fully differential amplifier with partial common-mode feedback, and the common-mode feedback circuit is a common-mode detection circuit based on a voltage comparator.

[0012] The external port of the entire op amp has a non-inverting input terminal VIP, an inverting input terminal VIN, a non-inverting output terminal VOP, an inverting output terminal VON, a common-mode voltage reference terminal CMREF, and a bias voltage terminal Vbias / Vbias1.

[0013] The first gain ...

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Abstract

The invention discloses a current multiplexing type feed-forward compensation fully differential operational amplifier, belonging to the technical field of fully differential operational amplifiers. The current multiplexing type feed-forward compensation fully differential operational amplifier comprises a first gain stage, a second gain stage, a feed-forward stage and a common mode feedback circuit, wherein the feed-forward stage and the second gain stage are loads for each other and current is multiplexed. According to the current multiplexing type feed-forward compensation fully differential operational amplifier, the power consumption of the whole operational amplifier can be remarkably reduced; meanwhile, high low-frequency open-loop gain is realized and the bandwidth of the operational amplifier is extremely expanded; and the current multiplexing type feed-forward compensation fully differential operational amplifier can be widely applied to a trans-impedance amplifier, a programmable gain amplifier or a filter at the analog front end of a wireless radio frequency chip, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of fully differential operational amplifiers. Background technique [0002] In the analog front-end of wireless radio frequency chips, in order to process large-bandwidth signals with high precision, transimpedance amplifiers (TIA), programmable gain amplifiers (PGA) and filters require high-gain and large-gain-bandwidth products (GBW). Differential operational amplifier (abbreviated as fully differential operational amplifier). [0003] The traditional two-stage fully differential operational amplifier directly restricts the improvement of the bandwidth due to the Miller compensation of the capacitor, which makes the bandwidth of the transimpedance amplifier, programmable gain amplifier and filter limited. The fully differential operational amplifier based on feedforward compensation includes four parts: the first gain stage, the second gain stage, the feedforward stage and the common mode feedback circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/45695H03F2203/45134
Inventor 王帅叶向阳高博曲韩宾吴兰
Owner THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
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