Varactor tuned Colpitts oscillator with compensating varactor fo

Details Varactor tuned Colpitts oscillator with compensating varactor fo Varactor tuned Colpitts oscillator with compensating varactor fo

1983-03-01

1986-06-03

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331177V, 334 15, H03B 512

Patent

active

045932557

ABSTRACT:
An oscillation circuit includes as its principal components a Clapp capacitor and two feedback capacitors connected to each other and a resonance coil. A first series circuit including a first variable-capacitance diode and a first DC cutoff capacitor is connected in parallel with the resonance coil, while a second series circuit including a second variable-capacitance diode and a second DC cutoff capacitor is connected to a first diode such that a certain polarity terminal of the second variable-capacitance is faced against the same polarity terminal of the first diode. One end of the second DC cutoff capacitor in the second series circuit is connected to the one of the feedback capacitors. Furthermore, means is provided at the joint of the first variable-capacitance diode and the first DC cutoff capacitor for applying a DC voltage to enable the first and second variable-capacitance diodes.

REFERENCES:
patent: 3370254 (1968-02-01), Keller
patent: 3825858 (1974-07-01), Amemiya et al.
patent: 4430630 (1984-02-01), Sakamoto

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