AFC tuning circuit

Details AFC tuning circuit AFC tuning circuit

1975-02-06

1976-03-30

Safourek, Benedict V.

Oscillators

Relaxation oscillators

331 36C, H04B 116

Patent

active

039477720

ABSTRACT:
An AFC tuning circuit is provided having a tuning capacitance in parallel with a series connection of a varactor and an inductance coil. A series-connected switch and capacitor are connected in parallel with the varactor. Another switch is connected in parallel with a portion of the inductance coil. Both switches are open for a lower frequency band and closed for a higher frequency band to provide a relatively uniform AFC circuit sensitivity for both frequency bands.

REFERENCES:
patent: 2811647 (1957-10-01), Nilssen
patent: 3332035 (1967-07-01), Kovalevski
patent: 3400338 (1968-09-01), Ishman
patent: 3517352 (1970-06-01), Marshall et al.
patent: 3519939 (1970-07-01), Tashima
patent: 3533000 (1970-10-01), Bushnell
patent: 3825858 (1974-07-01), Amemiya et al.

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