Digital phase-frequency detector

Details Digital phase-frequency detector Digital phase-frequency detector

1979-02-16

1981-05-12

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307528, 328110, H03L 700, H03K 526

Patent

active

042675146

ABSTRACT:
A digital phase-frequency detector which provides rapid frequency acquisition and phase control when used in phase-locked loop applications. In a locked condition the output of a pair of flip-flop circuits are high causing an EXOR gate to produce a detector output, when unlocked a phase difference will increase until the higher frequency exhibits two positive transitions before one positive transition of the lower frequency can propagate through the circuit, this will cause the flip-flop receiving the higher frequency to change state thereby preventing the EXOR gate from gating and the other flip-flop from changing state, the flip-flop therefore controls the detector output until the two input freqencies again coincide and the output controlled by the EXOR gate.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway
patent: 3688202 (1972-08-01), Naubereit et al.
patent: 3755746 (1973-08-01), Hogue et al.
patent: 4020422 (1977-04-01), Underhill
patent: 4105947 (1978-08-01), Crowley
patent: 4122405 (1978-10-01), Tietz et al.

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