Методи та засоби підвищення точності циклічних АЦП на основі вагової надлишковості

Abstract

The thesis are deals with ways to improve the accuracy of the cyclic ADC with weight redundancy. The method of self-calibration of the cyclic ADC with weight redundancy by analysis of the ADC’s input-output characteristic has been proposed in order to calculate the operating value of the converter radix and increase its accuracy. The calibration method of cyclic ADC with weight redundancy is proposed, which consist on introducing of structural redundancy in the form of the calibration low-resolution ADC and calibration signal generator in the basic structure, which allows to eliminate additive component of the error and reduce the influence of multiplicative. The structural schemes of the proposed methods of calibration cyclic ADC are adduced. The analysis of the ADC’s input-output characteristic with weight redundancy are elaborateness, which allowed to define prohibited zones of the code combinations, in order to calculate the operating value of the converter radix. The generalized mathematical model of static errors of the cyclic ADC has been extended to identify the relationship between the primary errors of individual blocks of the converter and the ADC’s input-output characteristic, it allows to arrange the static errors and suggest ways to reduce them.