Digital phase-frequency detector

Details Digital phase-frequency detector Digital phase-frequency detector

1979-11-23

1982-06-01

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307514, 307525, H03K 526

Patent

active

043330550

ABSTRACT:
Digital circuitry, and a corresponding method for its operation, for detecting frequency or phase-angle differences between two digital input signals. The detector includes a differentiating circuit to provide signals indicative of the times of occurrence of a selected feature of the input signals, such as a pulse edge, and a pair of memory devices, such as flip-flops, which can be set by respective input signals. The detector further includes a feedback circuit operative to clear both flip-flops in the event that the input signals would be effective to place both of them in a set condition. The feedback circuit operates in a parallel, rather than a series timing relationship with input circuitry that sets the flip-flops, and the performance of the detector is thereby significantly improved, as evidenced by a smaller dead zone in its phase output characteristic for a given frequency of operation, or a capability of operation at higher frequencies for a given degree of degradation.

REFERENCES:
patent: 3328688 (1967-06-01), Brooks
patent: 3430148 (1969-02-01), Miki
patent: 3514705 (1970-05-01), Feigleson
patent: 3626307 (1971-12-01), Koyama
patent: 3750035 (1973-07-01), Crow
patent: 3755747 (1973-08-01), Letosky

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