Oscillator control circuit with phase detection feedback

Details Oscillator control circuit with phase detection feedback Oscillator control circuit with phase detection feedback

1996-01-04

1997-08-05

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 1A, 331 27, 375376, 455263, 455265, 455318, H03L 7085

Patent

active

056546742

ABSTRACT:
A controllable crystal oscillator of a receiver having a mixer producing an IF signal is controlled by a feedback loop that includes a phase detector. The IF signal is delayed by an odd multiple of .pi./2 and fed to one input of an exclusive-OR circuit, with the other input receiving the IF signal directly. The phase detection signal from the exclusive-OR circuit can be counted and converted to an analog voltage when the oscillator is a voltage controlled oscillator or it can be counted and used as a digital control signal when the oscillator is a data controlled oscillator.

REFERENCES:
patent: 4255759 (1981-03-01), Ohmori et al.
patent: 4672636 (1987-06-01), Marshall et al.

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