Patent attributes
A processing system for an input device includes a comparator, a digital-to-analog converter (DAC), and a feedback path coupling the DAC to the comparator. The comparator generates a first comparison signal associated with a resulting signal and a first output signal of the DAC; and generates a second comparison signal associated with the resulting signal and a second output signal of the DAC. The processing system also includes a control module and a determination module. The control module is coupled to the DAC and to the comparator's output and modifies a rising reference value and a falling reference value based on the first comparison signal and the second comparison signal, respectively. The determination module determines positional information for an input object in a sensing region of the input device based on the rising reference value and the falling reference value.
