Abstract: A pressure detection chip and a method for detection pressure are disclosed. The method is executed by a pressure detection apparatus including a cancellation circuit and a coupling circuit in parallel; the coupling circuit includes a variable capacitance component having a first electrode layer and a second electrode layer. The method for detection pressure includes: inputting a first input signal to the cancellation circuit and outputting a first output signal; and inputting a second input signal to the coupling circuit and outputting a second input signal, where the first input signal and the second input signal are 180 degrees out of phase, and the first output signal is configured to cancel the second output signal; and determining whether the first electrode layer is subjected to the touch pressure, according to the first output signal and the second output signal.

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.

Abstract: A pressure detection chip and a method for detection pressure are disclosed. The method is executed by a pressure detection apparatus including a cancellation circuit and a coupling circuit in parallel; the coupling circuit includes a variable capacitance component having a first electrode layer and a second electrode layer. The method for detection pressure includes: inputting a first input signal to the cancellation circuit and outputting a first output signal; and inputting a second input signal to the coupling circuit and outputting a second input signal, where the first input signal and the second input signal are 180 degrees out of phase, and the first output signal is configured to cancel the second output signal; and determining whether the first electrode layer is subjected to the touch pressure, according to the first output signal and the second output signal.

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.