Variable capacitance circuit and wireless communication device

Abstract

To achieve higher self-resonant frequency and lower parasitic resistance of a variable capacitance circuit whose capacitance value is changeable. The variable capacitance circuit includes a capacitor unit, a reactive element, and a bias circuit. The capacitor unit inside the variable capacitance circuit includes plural semiconductor elements connected in series, the plural semiconductor elements each having a capacitance value based on a bias voltage applied thereto. Further, the reactive element inside the variable capacitance circuit is connected to the capacitor unit. The bias circuit inside the variable capacitance circuit applies a bias voltage to each of the plural semiconductor elements.

Dependencies are inferred from the claim text.