Phase comparator

Details Phase comparator Phase comparator

1987-05-13

1988-10-04

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 307352, 328133, 328151, H03K 500, H03K 5159

Patent

active

047758112

ABSTRACT:
A phase comparison circuit for producing a voltage error signal proportional to the difference in phase between a reference signal and an input signal. The reference signal is in the form of a sawtooth wave signal having a fixed frequency and fixed period. The input signal may vary widely in frequency. Sample pulses are derived from the input signal and are used to sample the ramps of the sawtooth signal to produce the error signal. When the frequency of the input signal differs from that of the reference signal to such an extent that the sample pulses do not occur during the ramps of the sawtooth signal, the sawtooth signal is repeatedly shifted in phase by one of two fixed amounts, depending upon the direction of the frequency difference, until the sample pulses occur during the ramps of the sawtooth signal.

REFERENCES:
patent: 4068181 (1978-01-01), Clark et al.
patent: 4151473 (1979-04-01), Coleman et al.
patent: 4216396 (1980-08-01), Balaban et al.
patent: 4358736 (1982-11-01), De Boer
patent: 4370616 (1983-01-01), Rijckaert
patent: 4523150 (1985-06-01), Hogeboom

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