High-precision and low-offset charge comparator circuit

Abstract

The invention provides a high-precision and low-offset charge comparator applied to all levels of sub charge coupling pipelined circuits in a charge coupling pipeline analog to digital converter. The comparator comprises four charge detection switches, a common-mode insensitive signal detection circuit, a chopper-stabilized amplifying circuit and a voltage comparator. Since the charge detection switches and the chopper-stabilized amplifying circuit are added on the basis of a common voltage comparator, the comparator is quite suitable for high-precision charge comparison and quantification.

Description

technical field [0001] The invention relates to a comparator circuit, in particular to a high-precision and low-offset charge comparator circuit applied to a charge-coupled pipeline analog-to-digital converter. Background technique [0002] With the continuous development of digital signal processing technology, the digitization and integration of electronic systems is an inevitable trend. However, most signals in reality are continuously changing analog quantities, which need to be transformed into digital signals through analog-to-digital conversion before they can be input into digital systems for processing and control. Therefore, analog-to-digital converters are indispensable in future digital system design. made of. In applications such as broadband communications, digital high-definition television, and radar, systems require analog-to-digital converters with both very high sampling rates and resolutions. Portable terminal products in these application fields requir...

AI Technical Summary

Problems solved by technology

Since the AD converter generally enters the calibration mode first during the error calibration process, the normal data conversion work of the AD converter is interrupted at this time

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