DIGITAL SPECTRA OF NONUNIFORMLY SAMPLED SIGNALS - A ROBUST SAMPLING TIME OFFSET ESTIMATION ALGORITHM FOR ULTRA HIGH-SPEED WAVE-FORM DIGITIZERS USING INTERLEAVING

This is the third paper of a series describing theories and applications of a newly developed digital spectrum analysis technique for a class of nonuniformly sampled signals. This paper presents an algorithm for estimating the sampling time offsets encountered at the parallel sampling paths of an ultra high-speed waveform digitizing system which is realized by interleaving many sample-hold and A/D converter modules. One obvious application of this algorithm is to feed these estimates back to adjustable delay units in all the sampling paths to compensate the sampling-time offsets. Simulation results indicate that, with an 8-bit quantizer, the residual timing error can be reduced to just about 0.05 percent of the sampling period! © 1990 IEEE