Patent ID: 7183867
Filing Date: 2007-02-27
Classification: H03B,H03J

Abstract:
1. A voltage controlled variable capacitor of which capacitance value changes in accordance with a control voltage applied thereto, comprising: a plurality of variable capacitance means, each of which includes a fixed capacitor and a MOS transistor; and a common signal line connected to a gate of the MOS transistor for each of the plurality of variable capacitance means, wherein sizes of the MOS transistors, based on which the MOS transistors start to turn on in response to a gate voltage applied thereto, differ among the plurality of variable capacitance means; the plurality of variable capacitance means exhibit capacitance values based on the different sizes with respect to a predetermined control voltage, respectively; and a capacitance value of the voltage controlled variable capacitor is a composite value of the capacitance values of the plurality of variable capacitance means.