Patent ID: 8860432

Claim:
A system comprising: a sensor configured to detect a change in capacitance associated with a touch upon a touch panel; a drive module directly coupled to the sensor, the drive module configured to generate a first drive signal having a first waveform characteristic during a first phase and a second drive signal having a second waveform characteristic different from the first waveform characteristic during a second phase; an offset cancellation module directly coupled to the sensor, the offset cancellation module configured to furnish an adjustable capacitive value for the sensor; an offset cancellation drive module directly coupled to the offset cancellation module, the offset cancellation drive module configured to generate a first offset cancellation drive signal having the first waveform characteristic during the first phase and a second offset cancellation drive signal having the second waveform characteristic during the second phase, the first offset cancellation drive signal and the second offset cancellation drive signal for driving the offset cancellation module; and a measuring module coupled to the sensor, the measuring module configured to measure noise having the first waveform characteristic during the second phase.