Voltage control oscillator having frequency control circuit with

Details Voltage control oscillator having frequency control circuit with Voltage control oscillator having frequency control circuit with

1980-10-28

1982-11-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328133, 331 20, 331 25, 358158, H03L 714

Patent

active

043587402

ABSTRACT:
A VCO control circuit features a first exclusive-OR gate to the inputs of which are applied signals derived from the VCO to provide an output signal that has a 90.degree. phase shift with respect to a reference signal. A second exclusive-OR gate serves as a phase detector for the output and reference signals and provides, after filtering, a frequency control voltage for the VCO. The control voltage has about the same amplitude regardless of the presence or absence of the reference signal.

REFERENCES:
patent: 4112383 (1978-09-01), Burgert
Oshiro, "Exclusive-OR IC's Serve for Phase-Locking Tasks", Electronics, Jun. 22, 1970, p. 83.

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