Patent ID: 11868561
Assignee: CYPRESS SEMICONDUCTOR CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method comprising:
generating an in-phase drive signal and an opposite-phase drive signal;
selecting a sequence having a number of one values, negative one values, and zero values, wherein the one values correspond to the in-phase drive signal, the negative one values correspond to the opposite-phase drive signal, and the zero values correspond to a reference signal, wherein the reference signal is from a voltage potential or a ground potential, and wherein a sum of the sequence is equal to zero;
applying, at a substantially same time to each of a first set of transmitter electrodes at a first stage of a plurality of scanning stages, (i) at least one of the in-phase drive signal or the opposite-phase drive signal and (ii) the reference signal according to the sequence;
rotating the sequence to obtain a rotated sequence;
applying, at a substantially same time to each of a second set of transmitter electrodes at a second stage of the plurality of scanning stages, (i) at least one of the in-phase drive signal or the opposite-phase drive signal and (ii) the reference signal according to the rotated sequence; and
receiving sense signals from a set of receiver electrodes to detect a presence of an object on a touch panel, wherein the sense signals represent capacitances associated with the set of receiver electrodes.