Phase difference measuring device

Details Phase difference measuring device Phase difference measuring device

1994-07-29

1995-08-01

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 7648, 324 7662, 327 3, 327 12, G01R 2302

Patent

active

054382548

ABSTRACT:
A phase difference measuring device includes a phase detector, a low-pass filter/voltage controlled oscillator, a reference signal selector for selecting either an internal reference signal or an external reference signal as a reference signal, a phase comparator for comparing an undertest signal with the selected reference signal and obtaining a phase difference between the two compared signal. The internal reference signal is selected when the undertest signal is a jittering signal, and the external reference signal is selected when the undertest signal is a wandering signal. The undertest signal, the selected reference signal, and a relatively high frequency clock signal from external are sent to the phase comparator and a phase difference between the undertest signal and the selected reference signal is counted by the relatively high frequency clock signal.

REFERENCES:
patent: 4070618 (1978-01-01), Thomas
patent: 4112709 (1978-10-01), Brown
patent: 5019786 (1991-05-01), Fairley

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