Patent ID: 9727183
Date: 2017-08-08
CPC Classifications: G06F

Claim:
1. A touch screen sensor integrated circuit, comprising: a plurality of pins configured to receive a plurality of current signals, wherein each current signal is generated according to mutual capacitance in response to a modulation signal; a current conveyor configured to receive the current signals from the pins, sense the current signals and generate a plurality of pairs of sensed current signals each pair corresponding to a respective one of the current signals, wherein each pair of the sensed current signals comprises first and second sense current signals; a delay table configured to store phase delay information; a control logic configured to generate a mixer control signal and control a timing of the mixer control signal using the phase delay information; and a mixer configured to receive the plurality of pairs of sensed current signals from the current conveyor and generate a plurality of subtracted current signals, wherein each subtracted current signal is generated by performing a subtraction on sensed current signals corresponding to a pair of the pins, and wherein the mixer generates the plurality of subtracted current signals in response to the mixer control signal.