ANALYSIS OF DISTORTION IN A D CONVERTERS BY TIME-DOMAIN AND CODE-DENSITY TECHNIQUES/

Two new methods for measuring the total harmonic distortion of an A/D converter are described. One is based on time-domain analysis, the oth er on modified code density analysis, Experiments show that these meth ods give results comparable to the ones provided by FFT analysis. It i s then shown, by both experiments on a flash converter and computer si mulations, that the conventional code density analysis does not provid e accurate signal-to-noise-plus-distortion ratio (SNDR) estimates at t he highest frequencies, while the proposed methods do.