Method and apparatus for determining control parameters of cancellation branch, and touch control detection apparatus

An apparatus for determining a control parameter of an offset branch of an electric circuit, comprising:

• a first phase delay determining unit;
• a second phase delay determining unit;
• and
• a control parameter determining unit;
• wherein,
• when a first constant signal is input to the offset branch and a first excitation signal is input to a self-capacitance detection branch, a rear-end processing circuit of the self-capacitance detection branch at least performs differential processing for an output signal of the offset branch and an output signal of the self-capacitance detection branch to obtain a first output signal, the first phase delay determining unit is configured to determine, based on the first output signal, a sum of phase delays generated by the self-capacitance detection branch and the rear-end processing circuit of the self-capacitance detection branch in response to the first excitation signal;
• when a second constant signal is input to the self-capacitance detection branch and a second excitation signal is input to the offset branch, the rear-end processing circuit of the self-capacitance detection branch at least performs differential processing for the output signal of the offset branch and the output signal of the self-capacitance detection branch to obtain a second output signal, and the second delay determining unit is configured to determine, based on the second output signal, a phase delay generated by the rear-end processing circuit in response to the second excitation signal;
• and
• the control parameter determining unit is configured to determine the control parameter of the offset branch based on the sum of phase delays and the phase delay generated by the rear-end processing circuit in response to the second excitation signal, wherein the control parameter of the offset branch is resistor and capacitor values.