Digital phase and frequency comparator circuit

Details Digital phase and frequency comparator circuit Digital phase and frequency comparator circuit

1983-07-18

1985-07-02

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307 87, 307514, 307526, 307527, 307269, 328136, 328155, H03K 5153, H03K 1200, H03K 1921

Patent

active

045270805

ABSTRACT:
A digital phase and frequency comparator circuit establishes phase and frequency windows to determine if two AC signals are in phase and of substantially the same frequency. A phase difference between the two signals is determined by exclusively ORing the two signals and timing the duration of a signal state to determine if the phase difference exceeds a threshold. The two AC signals are also ANDed and counted to determine the frequency agreement.

REFERENCES:
patent: 3849671 (1974-11-01), Molack
patent: 3857103 (1974-12-01), Grazia
patent: 3947775 (1976-03-01), Thiebaut
patent: 4246497 (1981-01-01), Lawson et al.
patent: 4267514 (1981-05-01), Kimsey
patent: 4329653 (1982-05-01), Offermanns
patent: 4354124 (1982-10-01), Shima et al.
patent: 4362957 (1982-12-01), Stern
patent: 4381457 (1983-04-01), Wiles

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