Oscillator frequency control loop

Details Oscillator frequency control loop Oscillator frequency control loop

1976-05-26

1977-09-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, H03B 304

Patent

active

040485811

ABSTRACT:
In an oscillator circuit controlled by a reference frequency a voltage regulated oscillator is controlled by the output voltage from digital-to-analog converter whose digital input is obtained from an up/down counter. The counter is controlled by the output from a frequency difference detector which compares the output of the voltage control oscillator and the reference frequency. A threshold circuit is connected between the frequency difference detector and the activation and up/down control inputs of the counter so that the counter is activated only when the frequency difference exceeds a predetermined amount.

REFERENCES:
patent: 3484712 (1969-12-01), Foote et al.
patent: 3551826 (1970-12-01), Sepe

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