Touch analog front end and touch sensor controller having the same

A touch sensor controller (TSC), comprising:

• a touch analog front-end (AFE) including:
• m+n transmitters, each transmitter configured to charge one of m X-axis line sensors and n Y-axis line sensors, and
• m+n receivers, each receiver configured to sense one of the m X-axis line sensors and the n Y-axis line sensors, wherein each of the m+n receivers comprises:
• a charge-to-voltage (C2V) converter configured to convert an amount of change of a capacitance received from the touch panel into a voltage signal;
• a filter configured to filter a noise from the voltage signal, resulting in a filtered voltage signal;
• an integrator configured to accumulate the filtered voltage signal;
• and
• a polarity detection circuit configured to monitor the filtered voltage signal and control the integrator to invert a polarity of the filtered voltage signal when the polarity of the filtered voltage signal is negative.

A user-interactive device comprising:

• a touch panel including a plurality of X-axis line sensors and a plurality of Y-axis line sensors;
• and
• a touch analog front end (AFE) comprising:
• a plurality of transmitters, each configured to charge one of the plurality of X-axis line sensors and a plurality of Y-axis line sensors;
• and
• a plurality of receivers, each configured to sense one of the plurality of X-axis line sensors and a plurality of Y-axis line sensors, wherein each receiver comprises:
• a charge-to-voltage (C2V) converter configured to convert an amount of change of capacitance received from the associated line sensor of the touch panel into a voltage signal;
• a filter configured to filter a noise from the voltage signal, resulting in a filtered voltage signal;
• an integrator configured to accumulate the filtered voltage signal;
• and
• a polarity detection circuit configured to monitor the filtered voltage signal and to control the integrator to invert a polarity of the filtered voltage signal when it is detected to be negative.