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Digital spectra of nonuniformly sampled signals: fundamentals and high-speed waveform digitizers

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1 Author(s)
Jenq, Y.-C. ; Phys.-Tech. Bundensanstalt, Braunschweig, West Germany

A digital spectral representation of a nonuniformly sampled signal is derived, and a spectrum analysis of a nonuniformly sampled sinusoid is presented. It is found that the spectrum of a nonuniformly sampled sinusoid comprises uniformly spaced line spectra; in addition, the signal-to-noise ratio is obtained in closed form. The theories are then applied to analyze the harmonic distortion introduced in high-speed waveform digitizers due to time-base errors. Specifically, waveform digitizers are analyzed which utilize interleaving/multiplexing and random equivalent time-sampling techniques and the monolithic A/D converter technology to extend their capabilities. Theoretical results are confirmed by experimental results with a real waveform digitizer

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:37 ,  Issue: 2 )

Date of Publication:

Jun 1988

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