NASA NTRS · 19780000162
Femtosecond time-domain phase comparator
Abstract
Phase shift in test device is measured by summing output of mixer with ramp voltage and comparing time interval between zero crossings of summed signal and ramp reference frequency. Circuit can be used to test devices at other frequencies by changing only signal source, phase splitter, and mixer; divider and time-interval counter need not be driven by oscillator.
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Donahoe, T., Reinhardt, V.. 1978-10-01. Femtosecond time-domain phase comparator. https://ntrs.nasa.gov/citations/19780000162
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