Numerically controlled phase lock loop synthesizer/modulator and

Details Numerically controlled phase lock loop synthesizer/modulator and Numerically controlled phase lock loop synthesizer/modulator and

1994-09-29

1995-08-22

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 1A, 331 11, 331 14, 331 16, 329345, 327 2, 327107, 455260, 332104, H03D 300, H03C 300, H03L 700, H03L 7091

Patent

active

054444209

ABSTRACT:
A phase lock loop (PLL) circuit and method in which a PLL circuit locks on a variable input phase by providing an instantaneous phase value of a signal from an oscillator at periodic intervals, and by providing phase corrective signals to the oscillator at the same periodic intervals by comparing an instantaneous value of the variable phase to the corresponding instantaneous value of the oscillator signal phase, the phase corrective signals adjusting the phase of the oscillator signal to the predetermined phase. The PLL circuit may also lock on a predetermined frequency by providing frequency corrective signals until a difference between the predetermined frequency and the frequency of oscillator signal is smaller than a predetermined threshold.

REFERENCES:
patent: 3593182 (1971-07-01), Roelofs et al.
patent: 4313209 (1982-01-01), Drucker
patent: 4612515 (1986-09-01), Ohkawa et al.
patent: 4862104 (1989-08-01), Muratani et al.
patent: 4879527 (1989-11-01), Geile et al.
patent: 5235622 (1993-08-01), Yoshida

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