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 dynamic capacitance, a conversion method and a calibration method. The analog-to-digital converter in the present invention can complete the white-adaptive calibration of the analog-to-digital converter with the support of the white-adaptive filter by introducing a dynamic capacitance. 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; Capacitor matching accuracy requirements, reduced area, reduced power consumption, increased speed, without sacrificing the input signal range, especially suitable for process size reduction.

Description

Technical field

[0001] The invention relates to the technical field of analog signal to digital signal conversion, in particular to an adaptive charge redistribution analog-to-digital converter based on dynamic capacitance, and is particularly suitable for real-time tracking of environmental changes, low-power charge redistribution analog-to-digital converters 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. The charge redistribution analog-to-digital converter, because of its simple design and low power consumption, is suitable for the shrinking of the process size. Important structure. However, the accuracy of the charge redistribution analog-to-digital converter 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 adaptive concepts ha...

Images