| 摘要 |
A touch screen controller using differential signal processing includes a charge amplifier, a first variable gain amplifier, one or more second variable gain amplifiers, a channel integrator, and a linearizer. The charge amplifier converts a charge output from a touch panel into a voltage and output a single-ended signal. The first variable gain amplifier removes an offset except touch information existing on a path sensing signal. The one or more second variable gain amplifiers removes an offset between channels while referring to a line signal input to the first variable gain amplifier. The channel integrator performs integration on the signal output from the first and the second variable gain amplifier and return a common reference to a pixel result, and the linearizer performs linearization by detecting a linearization factor and a phase error of the output signal of the channel integrator. |
