Digital phase difference detecting circuit

Details Digital phase difference detecting circuit Digital phase difference detecting circuit

1985-12-17

1988-01-26

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

328133, G01R 2500

Patent

active

047219041

ABSTRACT:
A digital phase difference detecting circuit has a phase shifting circuit for shifting by +90.degree. or -90.degree. a phase of an input signal which has been sampled over a predetermined sampling period, a dividing circuit for dividing an output signal of the phase shifting circuit by the input signal, an operation circuit for performing an inverse trigonometric function operation on an output signal of the dividing circuit, and a subtracting circuit for obtaining the difference between an output signal of the operation circuit and a phase of a reference signal. The resulting output signal of the subtracting circuit indicates the phase difference between the reference signal and the input signal.

REFERENCES:
patent: 4307346 (1981-12-01), Kurosawa

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