Capacitance Offset Compensation for Electronic Device

An electronic device, comprising:

• a touch input device;
• a touch sensing circuit coupled to the touch input device;
• and
• a capacitance offset compensation circuit, comprising:
• a first selector for selecting one of a first coupling voltage and a second coupling voltage of the touch input device in response to a control signal from the touch sensing circuit;
• a second selector for selecting one of the first coupling voltage and the second coupling voltage in response to the control signal;
• a first offset compensation capacitor array coupled to the first selector and a driving signal, for adjusting an output equivalent capacitance of the first offset compensation capacitor array in response to the control signal for compensating a cross coupling capacitance of the touch input device;
• and
• a second offset compensation capacitor array coupled to the second selector and a reference voltage, for adjusting an output equivalent capacitance of the second offset compensation capacitor array in response to the control signal for compensating a GND parasitic capacitance of the touch input device.

An electronic device, comprising:

• a touch input device;
• a touch sensing circuit coupled to the touch input device;
• and
• a capacitance offset compensation circuit, comprising:
• a first offset compensation capacitor array coupled to a reference voltage or a driving signal in response to a control signal from the touch sensing circuit and coupled to one of a first coupling voltage and a second coupling voltage of the touch input device in response to the control signal, for adjusting an output equivalent capacitance of the first offset compensation capacitor array in response to the control signal for compensating at least one of a GND parasitic capacitance and a cross coupling capacitance of the touch input device.