Front-end signal compensation
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United States of America Patent
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Nov 1, 2011
Grant Date -
Jul 3, 2008
app pub date -
Jan 3, 2007
filing date -
Jan 3, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A touch surface device having improved sensitivity and dynamic range is disclosed. In one embodiment, the touch surface device includes a touch-sensitive panel having at least one sense node for providing an output signal indicative of a touch or no-touch condition on the panel; a compensation circuit, coupled to the at least one sense node, for generating a compensation signal that when summed with the output signal removes an undesired portion of the output signal so as to generated a compensated output signal; and an amplifier having an inverting input coupled to the output of the compensation circuit and a non-inverting input coupled to a known reference voltage.
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