Patent ID: 6177894
Filing Date: 2001-01-23
Classification: H03M

Abstract:
A system for evaluating an analog-to-digital converter comprising:signal generator for generating an analog signal that is wave-shaped;a timing controller for generating a clock which is used in feeding the analog signal to an analog-to-digital converter under test;Hilbert pair resampling means for deriving from an output digital signal from the analog-to-digital converter a digital signal corresponding to a cosine wave and a digital signal corresponding to a sine wave having the period of the analog signal and which are related to each other as Hilbert transform pair;instantaneous amplitude calculation means for determining an instantaneous amplitude representing both digital signals derived by the Hilbert pair resampling means;first digital moving differentiator means receiving the instantaneous amplitude as an input and calculating a moving difference signal; andfirst peak detecting means receiving the moving difference signal as the input and determining a maximum value thereof to estimate the differential non-linearity of the analog-to-digital converter.