Automatic phase and frequency control system

Details Automatic phase and frequency control system Automatic phase and frequency control system

1976-09-27

1978-02-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 25, 331 31, H03B 304

Patent

active

040729095

ABSTRACT:
An automatic phase and frequency control system includes a pair of multipliers coupled to a source of input signal. A voltage controlled oscillator is also coupled to each of the multipliers. Means are provided to phase shift the oscillator signal at one multiplier such that quadrature beat signals are produced. The output of one of the multipliers is coupled directly to a third multiplier while the output of the other is coupled to a low pass filter. The filtered signal is amplitude limited and applied to the third multiplier. A second low pass filter couples the output of the third multiplier to the frequency control input of the voltage controlled oscillator.

REFERENCES:
patent: 2522371 (1950-09-01), Guanella et al.
patent: 3768030 (1973-10-01), Brown et al.
patent: 3789316 (1974-01-01), Goetz et al.

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