Device and method for capacitive sensing

A method for capacitive sensing comprising:

• obtaining sensing signals from sensing electrodes;
• generating first mixer output signals by modulating first carrier waves with the sensing signals;
• combining the first mixer output signals;
• and
• detecting an object based on the combined first mixer output signals.

A system, comprising:

• sensing circuitry configured to:
• obtain sensing signals from sensing electrodes;
• and
• generate an output signal based on the sensing signals;
• processing circuitry configured to detect an object based on the output signal from the sensing circuitry, wherein the processing circuitry comprises:
• an analog-to-digital converter configured to convert the output signal to a digital signal;
• a digital demodulator configured to demodulate the digital signal;
• and
• a decoder configured to perform a product-sum operation based on an output of the digital demodulator to generate a first digital output.