Varactor tuning circuit having plural selectable bias voltages

Details Varactor tuning circuit having plural selectable bias voltages Varactor tuning circuit having plural selectable bias voltages

1986-01-06

1987-12-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331177V, 334 15, 455183, 455186, 455195, H03B 508, H03H 512, H03L 718

Patent

active

047136316

ABSTRACT:
A variable capacitance circuit includes a varactor having an anode side and a cathode side. A first variable bias voltage is applied to one of the sides and one of a plurality of voltages is applied as a second bias voltage to the other side for controlling the capacitance of the varactor. A voltage multiplier circuit connected to a voltage divider network is used for supplying the plurality of voltages. A decoder is responsive to input signals for selecting and applying one of the multiple voltage outputs. The variable capacitance circuit is used in a voltage controlled oscillator of a frequency synthesizer for providing extended frequency range.

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patent: 4370629 (1983-01-01), Martin
patent: 4511858 (1985-04-01), Charavit et al.

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