Patent ID: 10627972

Abstract:
Provided is a capacitance detecting device (801) which includes a charging module (110) configured to charge a base capacitor (130) between a detecting electrode and system ground; an integrating circuit (150) including an amplifier (151) and an integrating capacitor (152), where the integrating capacitor (152) is connected in parallel with the amplifier (151), the integrating circuit (150) is configured to integrate, charges transferred from the base capacitor (130); a cancellation capacitor (120) configured to cancel a contribution of the base capacitor (130) to an output voltage of the amplifier (151); a controlling module (140) configured to control the charging module (110) to charge the base capacitor (130) in a first phase, control the charging module (110) to stop charging the base capacitor (130) in a second phase, control transfer of the charges on the base capacitor (130) to the integrating capacitor (152) in a third phase.