Phase locked loop synthesizer

Details Phase locked loop synthesizer Phase locked loop synthesizer

1976-10-28

1977-09-13

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

325421, 325422, 331 22, 331 36C, H03B 304

Patent

active

040485820

ABSTRACT:
A phase locked loop synthesizer comprising a means for controlling a tuning means, wherein a phase difference between the outputs of a reference signal oscillator and a programmable counter means is detected by a phase detector to obtain a d.c. voltage corresponding to the phase difference, an output having a prescribed frequency is generated by a voltage controlled oscillator frequency is controlled by said d.c. voltage, a part of said output and the output having a second reference frequency from a local oscillator are mixed by a mixer, the mixed output is supplied to a tuning means which is tuned to the mixed difference frequency, the output of said tuned means is supplied to said counter means to be frequency divided in a prescribed division ratio and sent to said phase detector, a part of digital input data for setting the frequency division ratio of said counter means is detected, and in accordance with the input data the tuning reactance of said tuning means is varied thereby to control the tuned frequency of said tuning means.

REFERENCES:
patent: 3440544 (1969-04-01), Pampel
patent: 3495195 (1970-02-01), Ribour
patent: 3845393 (1974-10-01), Basset

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