Phase locked oscillator

Details Phase locked oscillator Phase locked oscillator

1976-01-26

1977-04-12

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

329107, 331 23, 331 25, H03B 304

Patent

active

040178064

ABSTRACT:
A phase locked oscillator comprising a phase comparator, filter and voltage controlled oscillator coupled in conventional manner to form the forward path of the phase locked loop and a counter and logic circuit coupled to form the feedback path. An input pulse stream is applied to a monostable flip flop which responds to each input pulse to produce a pulse of predetermined length that is applied to one input of the phase comparator. The counter is coupled to receive the oscillator output pulses for counting repetitively to a predetermined count. The logic circuit responds to first and second counts in the predetermined count for respectively generating and terminating a reference pulse in response to each input pulse. The reference pulse is applied to the other input of the phase comparator which in turn provides an output signal indicative of the time displacement between each input pulse and its associated reference pulse to control the oscillator to run at a harmonic frequency of the input pulse stream.

REFERENCES:
patent: 3731220 (1973-05-01), Besenfelder
patent: 3898574 (1975-08-01), Allen et al.
patent: 3939438 (1976-02-01), Taylor

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