IMPROVEMENTS RELATING TO TIME-INTERLEAVED SAMPLERS

摘要

This invention relates to a method of calibrating a time-interleaved analogue-to-digital sampler (10) and to a method of performing analogue-to-digital conversion with a sampler (10) so calibrated. A method of calibrating a sampler (10) having N time-interleaved ADCs (12a-d), comprises: (a) injecting in turn N calibration signals (13) into the sampler such that each calibration signal (13) occupies one of N related frequencies; (b) measuring in the frequency domain the output at each of the N related frequencies for each one of the N calibration frequencies; (c) determining the relationship that relates the input signal to the output at each of the N related frequencies for each one of the N calibration frequencies; and (d) determining from the relationship at step (c) correction factors to be applied to calibrate an output of the sampler at each of the N related frequencies.