Phase comparator using two capacitors alternately charged via co

Details Phase comparator using two capacitors alternately charged via co Phase comparator using two capacitors alternately charged via co

1982-09-27

1985-06-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307511, 307514, 307519, 307246, 307247R, 307269, 328 55, 331 14, 331 17, 331 25, 375120, H03L 708

Patent

active

045231508

ABSTRACT:
One of two capacitors in a phase comparator is discharged for a logic zero data input and is alternately charged with opposite polarities, depending on the state of a regenerated clock signal, for a logic one data input. The resultant charge of the capacitor when the data input again becomes zero is used to control a variable frequency oscillator which produces the clock signal, while the other of the two capacitors is discharged and then charged in the same manner. A phase locked loop including the phase comparator can accommodate arbitrary data sequences of a return-to-zero data signal and does not require a low pass filter.

REFERENCES:
patent: 3982196 (1976-09-01), Poujois
patent: 4066919 (1978-01-01), Huntington
patent: 4151473 (1979-04-01), Coleman et al.
patent: 4167711 (1979-09-01), Smoot
patent: 4262258 (1981-04-01), Gaalema
patent: 4295099 (1981-10-01), Evans
patent: 4366456 (1982-12-01), Ueno et al.

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