Phase comparison circuit

Details Phase comparison circuit Phase comparison circuit

1980-07-10

1982-11-09

Heyman, John S.

Oscillators

Relaxation oscillators

328151, 331 25, G01R 2504

Patent

active

043587364

ABSTRACT:
A phase comparison circuit for comparing first and second pulse trains applied to first and second inputs (1 and 2) respectively, comprises a sawtooth signal generator (11,3) which is phase-locked to the first pulse train (V.sub.A) by means of a frequency control loop comprising a first sampling circuit (4,5) and an amplifier (12). The output signal of the sawtooth generator is sampled when each pulse occurs in the second pulse train (V.sub.B) by means of a second sampling circuit (8,9). In order that a phase difference of zero between the two pulse trains can be accurately determined, whatever their actual repetition frequency, the output signal of the arrangement is formed by means of a differential amplifier (10) as the difference between the output signals of the two sampling circuits.

REFERENCES:
patent: 3602826 (1971-08-01), List et al.
patent: 3863080 (1975-01-01), Steckler
patent: 4024414 (1977-05-01), Gurry

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