Variable capacitance circuit

Details Variable capacitance circuit Variable capacitance circuit

H - Electricity

03

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331/64

H03H 5/12 (2006.01) H03J 5/02 (2006.01) H03L 7/099 (2006.01) H03L 7/18 (2006.01) H03L 7/187 (2006.01) H03B 1/00 (2006.01)

Patent

CA 1282466

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 control oscillator of a frequency synthesizer for providing extended frequency range.

526098

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