Touch analog front end and touch sensor controller having the same
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
Sep 11, 2015
filing date -
Oct 6, 2014
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Abstract
A touch analog front-end (AFE) and a touch sensor controller (TSC) are provided. The touch AFE includes a transmitter configured to charge a touch panel and a receiver configured to sense the touch panel. The receiver includes a charge-to-voltage (C2V) converter configured to convert an amount of change of 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 to control the integrator to invert a polarity of the filtered voltage signal when it is negative.
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