Converter, circuit and method for compensation of non-idealities in continuous time sigma delta converters

摘要

A continuous time sigma delta converter has a filter and converter components having known non-ideal characteristics. A compensation circuit has error modelling components arranged to model the non-ideal characteristics of the converter. A summation block combines a compensation signal from the compensation circuit with a non-ideal output signal from the converter in order to provide a compensated output signal. This has substantially no effect on other modulator performance characteristics and contributes to the implementation of giga sample-per-second Continuous Time sigma deltas having the dynamic range capabilities of traditional DT sigma deltas.