Patent ID: 7170356

Claim:
A circuit with variable capacitance comprising: a capacitance, wherein the capacitance includes a first partial capacitance and a second partial capacitance connected in parallel to the first partial capacitance, wherein a capacitance value of the first partial capacitance depends on a first bias of the first partial capacitance, and a capacitance value of the second partial capacitance depends on a second bias of the second partial capacitance, wherein the first partial capacitance includes two auxiliary capacitances connected in series with a first tap point in-between, and the second partial capacitance includes two further auxiliary capacitances connected in series with a second tap point in-between, wherein the first bias is defined by a potential difference between the first tap point and a ground potential terminal, and the second bias is defined by a potential difference between the second tap point and the ground potential terminal, wherein the first tap point is electrically connected to a supply voltage terminal of the circuit with variable capacitance, wherein the first tap point is connected to the second tap point via a resistor, wherein the resistor connects the second tap point to the supply voltage terminal in a serial connection via the first tap point; and a biasing unit configured to provide the first bias and the second bias, wherein the first bias differs from the second bias.