Differential mode error calibration circuit of charge coupling assembly line analog to digital converter

Abstract

The invention provides a circuit for calibrating a differential mode error in a charge coupling assembly line analog to digital converter, comprising a differential mode error detection module, an error quantization module, an error correction module and a controller module, wherein the differential mode error detection module can automatically detect the differential mode error caused by the mismatch of components in the charge coupling assembly line analog to digital converter with a fully differential structure, and calibrates the differential mode error to control the influence of the differential mode error within the demand of the lowest resolution in the analog to digital converter so as to overcome the problem that the differential mode error limits the accuracy of the traditionalcharge coupling assembly line analog to digital converter because of component mismatch brought by process fluctuation, thereby further improving the conversion accuracy of the traditional charge coupling assembly line analog to digital converter.

Description

technical field [0001] The invention relates to a circuit for realizing the calibration of non-ideal characteristics of a pipeline analog-to-digital converter, in particular to a circuit for calibrating differential mode errors in 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 ...

AI Technical Summary

Problems solved by technology

For a charge-coupled pipeline ADC with an accuracy of more than 10 bits, the mismatched differential-mode error of components brought about by the existing process conditions cannot be ignored

Therefore, in order to realize a high-precision charge-coupled pipeline analog-to-digital converter with a fully differential structure with an accuracy of more than 10 bits, it is necessary to provide a circuit for calibrating the differential mode error caused by the mismatch of components in the positive and negative signal processing paths. In order to overcome the limitation of the accuracy of charge-coupled pipeline analog-to-digital converters caused by component mismatch differential mode errors caused by various non-ideal characteristics

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