Touch screen controller using differential signal processing

A touch screen controller using differential signal processing, the touch screen controller comprising:

• a charge amplifier configured to convert a charge output from a touch panel into a voltage and output a single-ended signal;
• a demodulator configured to convert a phase of a demodulated waveform to a phase of each path sensing signal included, in the output single-ended signal;
• a first variable gain amplifier configured to remove an offset except for touch information existing on a path sensing signal preset for differential processing of a signal output from the demodulator;
• at least one second variable gain amplifier configured to remove an offset between channels while referring to a line signal input to the first variable gain amplifier;
• a channel integrator configured to perform an integration on a signal output from the first and the at least one second variable gain amplifiers from a first channel and returning a common reference to a pixel result;
• and
• a linearizer configured to perform a linearization by detecting a linearization factor and a phase error of an output signal of the channel integrator.