Abstract: A processing system for an input device includes a sensor module and a noise mitigation module. The sensor module includes sensor circuitry and is configured to drive a plurality of transmitter electrodes with transmitter signals, and receive, with a plurality of receiver electrodes, resulting signals comprising effects corresponding to the transmitter signals. The noise mitigation module is configured to determine positional information for a first input object in a sensing region of the input device based on the resulting signals and to report the positional information. The noise mitigation module includes a touch buffer configured to store a plurality of input object states corresponding to the first input object and is configured to limit, when in a high-noise mode, the reporting of positional information based on the plurality of input object states stored in the touch buffer.

Abstract: A drive circuit that compensates for the dispersion of the characteristics of drive transistors is disclosed. A switch SW2 is turned off, and switches SW1 and SW3 are turned on. Thereby, a constant current from a constant current source CC1 is flown in a drive transistor T1. Consequently, a gate voltage corresponding to the constant current Is written in the gate of the drive transistor T1. Then, the switches SW1 and SW3 are turned off, and the switch SW2 is turned on. Simultaneously, the voltage of a capacitor C1 on the side of the switch SW4 is varied according to a signal voltage, and thereby the voltage is added to the gate of the drive transistor T1 to flow a current corresponding to the signal voltage in the drive transistor T1.