Capacitance detection circuit, touch control chip and electronic device

A touch control chip, comprising a capacitance detection circuit configured to detect a capacitance between a sensing electrode in a screen of an electronic device and a first driving electrode to which a driving signal is input, wherein the capacitance detection circuit comprises:

• an amplification circuit, connected to the sensing electrode and configured to convert a capacitance signal between the sensing electrode and the first driving electrode into a voltage signal, wherein the voltage signal is associated with the capacitance between the first driving electrode and the sensing electrode;
• a cancellation circuit, connected to the amplification circuit and configured to output a cancellation signal to the amplification circuit, wherein the cancellation signal is used to cancel a noise signal from the screen comprised in the voltage signal;
• and
• a control circuit, connected to a second driving electrode, in the screen, to which no driving signal is input, and configured to generate a control signal, wherein the control signal is configured to control the cancellation circuit to generate the cancellation signal.

An electronic device, comprising:

• a screen;
• and
• a touch control chip comprising a capacitance detection circuit, wherein the capacitance detection circuit is configured to detect a capacitance between a sensing electrode in a screen of an electronic device and a first driving electrode to which a driving signal is input, and the capacitance detection circuit comprises:
• an amplification circuit, connected to the sensing electrode and configured to convert a capacitance signal between the sensing electrode and the first driving electrode into a voltage signal, wherein the voltage signal is associated with the capacitance between the first driving electrode and the sensing electrode;
• a cancellation circuit, connected to the amplification circuit and configured to output a cancellation signal to the amplification circuit, wherein the cancellation signal is used to cancel a noise signal from the screen comprised in the voltage signal;
• and
• a control circuit, connected to a second driving electrode, in the screen, to which no driving signal is input, and configured to generate a control signal, wherein the control signal is configured to control the cancellation circuit to generate the cancellation signal.