Comparator and analog-to-digital (A/D) converter

Abstract

The invention relates to a comparator and an analog-to-digital (A / D) converter comprising the comparator. The comparator comprises a pre-amplification circuit, a latch gain circuit and an output buffer circuit, wherein the pre-amplification circuit pre-amplifies a first input signal and a second input signal to be compared and outputs the pre-amplified first pre-amplification signal and the pre-amplified second pre-amplification signal to the latch gain circuit, the latch gain circuit compares the first pre-amplification signal and the second pre-amplification signal and outputs comparison results to the output buffer circuit, the output buffer circuit is provided with an output metal oxide semiconductor (MOS) tube structure which is connected with a power supply, the on-off state is correspondingly changed on the basis of the amplified comparison results, and a first output signal and a second output signal corresponding to the comparison results are output. The comparator can perfectly solve the problem of driving and transmission time delay.

Description

Technical field [0001] The present invention relates to the field of integrated circuit design technology, in particular to the design technology of analog-to-digital converters (A / D converters). Background technique [0002] A / D converter is very important in communication products, and its performance greatly affects the overall performance of these products. In the A / D converter, the comparator is a core unit, and its accuracy, power consumption, speed and other indicators have an important influence on the performance of the entire A / D converter. [0003] The traditional comparator output buffer circuit generally uses a self-biased differential amplifier plus an inverter structure, but this circuit has the disadvantage of high power consumption because it is a static circuit. [0004] To solve the problem of power consumption, the prior art proposes an improved comparator output buffer circuit structure. figure 1 Shown is the improved comparator output buffer circuit. Reference...

AI Technical Summary

Problems solved by technology

When the output signal is high level, a large capacitor is needed to improve the output drive capability; while when the output signal is low level, a small capacitor is needed to reduce the transmission delay, which will make the value of the capacitor difficult to determine

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