CHARGE AMPLIFIER FOR MULTI-TOUCH CAPACITIVE TOUCH-SCREEN
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United States of America Patent
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Issued Date -
May 17, 2012
app pub date -
Nov 17, 2010
filing date -
Nov 17, 2010
priority date (Note) -
Abandoned
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Abstract
A circuit for measuring the cross-capacitance of a touch-screen sensor includes a charge amplifier having an input for coupling to the touch-screen sensor and an output for providing a voltage pulse, and a measurement delay chain having an input coupled to the output, and an output for providing a digitized output signal of the voltage pulse width, which is proportional to the value of the cross-capacitance.
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