NASA NTRS · 19920000499
Improved Zero-Crossing Detector
Abstract
Improved zero-crossing-detector circuit designed for precisely measuring difference between frequencies of two frequency-standard signal sources. Contains low-bandwidth first-stage amplifier and three limiting amplifiers, each "squares" signal bit more. Crosstalk eliminated and jitter reduced to about 10 to the negative 7th power microseconds.
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Dick, G. John, Kuhnle, Paul F.. 1992-09-01. Improved Zero-Crossing Detector. https://ntrs.nasa.gov/citations/19920000499
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