Variable capacitance circuit
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United States of America Patent
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Nov 25, 2014
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app pub date -
Nov 29, 2011
filing date -
Feb 24, 2011
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Abstract
A variable capacitance circuit includes: a prescribed node, to which an alternate current signal with a reference potential as a center voltage is applied; a first capacitor connected to the prescribed node; a second capacitor connected between the first capacitor and the reference potential; a third capacitor and a transistor for controlling capacitance, provide between a first node between the second capacitor and the first capacitor, and the reference potential; and a bias circuit which applies a first bias voltage to a second node between the third capacitor and the transistor.
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