Phase-lock loop control circuitry

Details Phase-lock loop control circuitry Phase-lock loop control circuitry

1982-03-03

1984-05-22

Heyman, John S.

Oscillators

Relaxation oscillators

331 25, H03D 1300, H03L 708

Patent

active

044504101

ABSTRACT:
Circuitry for controlling a phase-lock loop using a charge-pump phase detector is shown to comprise a phase detector network in combination with an operational amplifier connected to selected output signals from such network to produce a bipolar D.C. signal indicative of the phase difference between signals applied to such network, one of the signals being at a frequency half that of the other.

REFERENCES:
patent: 4023116 (1977-05-01), Alfke et al.
patent: 4122404 (1978-10-01), Fuhrman
patent: 4375694 (1983-03-01), Kuhn
"Test Your Charge-Pump Phase Detectors," Dr. William Egan and Eugene Clark, GTE Sylvania, P.O. Box 188, Mountain View, CA 94042.
Electronic Design 12, Jun. 7, 1978, pp. 134, 135, 136, 137.
Motorola Specification Sheet MC12040-MC12540.

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