Synaptics Incorporated
Mitigating interference in a capacitive sensing device

Abstract:

An example method of capacitive sensing includes: transmitting a first waveform over a first time period; transmitting a second waveform over a second time period, wherein the second waveform is independent of the first waveform, and wherein at least a portion of the second time period does not overlap the first time period; receiving, from sensor electrodes, a first resulting signal in response to capacitive coupling of the first waveform and a second resulting signal in response to capacitive coupling of the second waveform; and processing the second resulting signal over at least a portion of the first time period, and the second time period, to obtain independent capacitive measurements.