An adaptive charge redistribution analog-to-digital converter, conversion method and calibration method

Abstract

The invention discloses an adaptive charge redistribution analog-to-digital converter based on a conversion capacitance, a conversion method and a calibration method. The analog-to-digital converter in the present invention can complete self-adaptive calibration of the analog-to-digital converter with the support of an adaptive filter by introducing a conversion capacitor. The calibration method of the present invention can track environmental changes in real time and calibrate the non-linearity introduced by capacitance mismatch, with fast convergence speed and high precision; the analog-to-digital converter of the present invention can greatly reduce the requirements for capacitance matching accuracy, reduce area, and reduce power consumption , improve speed without sacrificing input signal range, especially suitable for process size reduction.

Description

technical field [0001] The invention relates to the field of analog signal to digital signal conversion, mainly an analog-to-digital converter, especially suitable for real-time tracking of environmental changes, low-power charge redistribution analog-to-digital converter and calibration. Background technique [0002] The analog-to-digital converter is the interface circuit between the analog circuit and the digital circuit in the signal processing process. Among them, the charge redistribution analog-to-digital converter, because of its simple design, low power consumption, and suitable for process size reduction, has become a very important structure. However, the accuracy of the charge redistribution ADC is limited from the beginning by the matching accuracy of the capacitor array. In recent years, the introduction of redundant analog-to-digital converters and the concept of self-adaptation has provided new solutions to the capacitance mismatch and accuracy problems of c...

AI Technical Summary

Problems solved by technology

Although the introduction of an adaptive filter to calibrate the charge redistribution analog-to-digital converter has many advantages over traditional calibration schemes, a problem that needs to be carefully considered is the modification of the analog and digital circuits by the corresponding calibration scheme, and the subsequent The calibration accuracy of the algorithm, the calibration speed, and the compromise of the speed, power consumption, area, and input signal range of the analog-to-digital converter

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