Capacitance measurement circuit

A capacitance measurement circuit, comprising:

• a charge to voltage converter (CVC), comprising:
• an excitation signal generation circuit, arranged to generate and connect an excitation signal to a first terminal of a capacitance sensor external to the CVC, for generating a sensing capacitance value;
• a differential amplifier, having an inverting input terminal, a non-inverting input terminal, an inverting output terminal, and a non-inverting output terminal, wherein the inverting input terminal is coupled to a second terminal of the capacitance sensor, and is arranged to receive the sensing capacitance value from the second terminal of the capacitance sensor;
• a first switch circuit, coupled between the inverting input terminal and the non-inverting output terminal of the differential amplifier;
• and
• at least one first variable capacitor, wherein the first switch circuit and the at least one variable capacitor are connected in parallel at the inverting input terminal and the non-inverting output terminal of the differential amplifier.