PROCESSING CIRCUIT, PROCESSING SYSTEM AND PROCESSING METHOD FOR TOUCH SIGNAL

摘要

PURPOSE: A touch signal processing circuit, a touch signal processing system, and a touch signal processing method are provided to optimize signal-to-noise ratio (SNR) by eliminating peak noise and connection noise including an input signal. CONSTITUTION: A differential circuit (110) generates a differential signal by differentiating an input signal applied through a coupling capacitor of a touch screen. A first integral circuit (120) eliminates successive noise included in the input signal by integrating the differential signal according to an integral control signal. A noise sensing circuit (130) generates a noise sensing signal activated by adding the peak noise to the input signal. The integral control signal is generated by using a noise sensing signal. When the peak noise is included in the input signal, the integral control signal is activated. When the peak noise is not included in the input signal, the integral control signal is inactivated. [Reference numerals] (110) Differential circuit (HPF); (120) First integral circuit (LPF); (131) Second integral circuit (LPF); (132) Noise detection circuit