Systems and methods for signaling and interference detection in sensor devices

A method of capacitive sensing, the method comprising:

• transmitting a first transmitter signal with a transmitter electrode, the first transmitter signal comprising a first transmitter frequency;
• receiving a resulting signal with a receiver electrode, the resulting signal comprising effects corresponding to the first transmitter signal;
• demodulating the resulting signal to produce an upper sideband signal and a lower sideband signal;
• selectably determining a first measurement of a change in capacitive coupling between the transmitter electrode and the receiver electrode based on at least one of the upper sideband signal and the lower sideband signal;
• and
• determining positional information for an input object based on the first measurement.

A capacitive sensor device comprising:

• a transmitter electrode;
• a receiver electrode;
• a processing system communicatively coupled to the transmitter electrode and the receiver electrode, the processing system configured to:
• transmit a first transmitter signal with the transmitter electrode, the first transmitter signal comprising a first transmitter frequency;
• receive a resulting signal with the receiver electrode, the resulting signal comprising effects corresponding to the first transmitter signal;
• demodulate the resulting signal to produce an upper sideband signal and a lower sideband signal;
• selectably determine a measurement of a change in capacitive coupling between the transmitter electrode and the receiver electrode based on at least one of the upper sideband signal and the lower sideband signal;
• and
• determine positional information for an input object based on the measurement.