Voltage buffer circuit and circuit including voltage buffer circuit to be used for driving loads to be switched along with time sequence

Abstract

The invention provides a voltage buffer circuit and a circuit including the voltage buffer circuit to be used for driving loads to be switched along with the time sequence. The voltage buffer circuit is used for driving loads and at least comprises a differential input stage, an output stage and a bias module. The voltage buffer circuit is capable of switching drive capacity provided for the loads rapidly, small in power consumption and fast in work speed; the high driving current can be provided when large loads are needed to be driven, the low driving current is provided when large loads are not needed to be driven, the bias module maintains a high current branch in the output stage at a cut-off critical point, and accordingly, the output stage static current is reduced greatly. Meanwhile, the large current branch in the output stage is not cut off completely, so that the large current branch can be connected rapidly when the high driving current is needed, and the circuit switching speed and the reference voltage stability are improved.

Description

technical field [0001] The invention relates to the technical field of snubber circuits, in particular to a voltage snubber circuit and a circuit for sequentially switching driving loads thereof. Background technique [0002] In analog integrated circuits, it is often encountered that the size of the load driven by the reference voltage will switch in time, for example, in SAR ADC (Successive Approximation Register Analog-to-Digital Converter, successive approximation register analog-to-digital converter), the comparator The common-mode reference voltage at the input terminal needs to drive a large sampling capacitor (that is, a load) under the cooperation of timing, so the circuit that provides the common-mode reference voltage plays a key role in the performance of the entire circuit. [0003] In the sampling stage of the SAR ADC circuit, the common-mode reference voltage generated by the reference input voltage needs to be able to quickly drive the large capacitor array t...

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a voltage buffer circuit and a circuit with its driving load switched in sequence, which is used to solve the problem of the reference voltage generating circuit driving a large load in the prior art. The problem of wasting quiescent current power consumption due to large drive capability

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