Portal de Periódicos da CAPES

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

1988; Institute of Electrical and Electronics Engineers; Volume: 37; Issue: 2 Linguagem: Inglês

10.1109/19.6060

1557-9662

Y.-C. Jenq,

Advancements in PLL and VCO Technologies

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. >