Patent ID: 8347715

Claim:
A variable capacitance electronic device, comprising: a first capacitive component, having a variable capacitance and including: a first signal terminal; a second signal terminal; and a variable capacitive network having: a plurality of switched capacitors, each switched capacitor being selectively switchable between a first configuration and a second configuration, in the first configuration the switched capacitor being electrically coupled between the first signal terminal and the second signal terminal and in the second configuration the switched capacitor being electrically coupled to at most one of the first signal terminal and the second signal terminal; a control stage electrically coupled to the first capacitive component and configured to control the variable capacitance based on a reference signal and an excitation signal, the reference signal having a reference frequency and the excitation signal having an excitation frequency that is a multiple of the reference frequency, the control stage including: a logic module configured to periodically switch each switched capacitor between the first and the second configuration, based on the reference signal; and a first sign circuit electrically coupled to the first capacitive component and configured to provide a first control signal to the first capacitive component, the first control signal having concordant edges with the excitation signal in one half-period of each cycle of the reference signal and discordant edges with the excitation signal in the other half-period of each cycle of the reference signal.