Patent ID: 6225861
Filing Date: 2001-05-01
Classification: H03H

Abstract:
A variable capacitance circuit assembly comprising:a first variable capacitance circuit including: first and second variable capacitance diodes, said first and second variable capacitance diodes having reverse polarities relative to each other; and an output connected to said first and second variable capacitance diodes;a second variable capacitance circuit including third and fourth variable capacitance diodes, said third and fourth variable capacitance diodes having reverese polarities relative to each other and being connected in parallel with the output of said first variable capacitance circuit;means for appling an input signal to the first and second variable capacitance diodes of the first variable capacitance circuit at ends of the first and second variable capacitance diodes opposite the ends connected to the output;means for producing a first capacitance control voltage and a means for producing a second capacitance control voltage;means for adjusting the first and second capacitance control voltages so that the capacitance control voltages vary differentially with each other; andmeans for applying the first capacitance control voltage to said first variable capacitance circuit and for applying the second capacitance control voltage to said second variable capacitance circuit wherein the variable capacitance diodes to which the capacitance control voltages are applied have the same polarity.