Patent ID: 8884909

Claim:
A control circuit for a capacitive touch panel, the capacitive touch panel comprising a first trace and a second trace, the control circuit comprising: a modulator for providing a first signal and a second signal in phase with the first signal; a multiplexer coupled with the capacitive touch panel and the modulator for simultaneously applying the first signal to the first trace and the second signal to the second trace for generating a third signal corresponding to the first trace; and a demodulator coupled with the multiplexer for demodulating the third signal on the first trace with a reference DC signal; wherein the first trace and the second trace are substantially parallel and directly adjacent to each other; wherein the demodulator comprises a first switch, a second switch, a third switch and a fourth switch, each having a first terminal and a second terminal, wherein the first terminals of the first switch and the second switch are directly coupled to a first output terminal of the demodulator, wherein the first terminals of the third switch and the fourth switch are directly coupled to a second output terminal of the demodulator, wherein the second terminals of the first switch and the third switch directly receive the third signal, and wherein the second terminals of the second switch and the fourth switch directly receive the reference DC signal.