AFC circuit with improved sensitivity

Details AFC circuit with improved sensitivity AFC circuit with improved sensitivity

1974-11-21

1976-02-24

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177V, 334 15, H03B 512

Patent

active

039407144

ABSTRACT:
An AFC circuit has a tuning circuit including a first variable capacitance element and a pair of series connected inductive elements. Switch means are connected between ground and a point between the inductive elements for alternatively operably connecting one or both of the inductive elements in parallel with the first variable capacitance element to switch the tuning circuit between a higher frequency range and a lower frequency range. The AFC portion of the circuit comprises a second variable capacitance element which is connected in parallel with the first variable capacitance element. In order to improve the sensitivity of this circuit, a means is provided for capacitively coupling the second variable capacitance element to a point between the inductive elements. As a result, substantially equal AFC ranges are obtained whether the circuit is tuned to the higher or the lower frequency range.

REFERENCES:
patent: 3825858 (1974-07-01), Amemiya et al.

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