Quadrature demodulation for touch sensitive devices
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United States of America Patent
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Aug 19, 2014
Grant Date -
Aug 15, 2013
app pub date -
Feb 15, 2012
filing date -
Feb 15, 2012
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Abstract
Demodulation circuits and processes for demodulating touch signals from a touch sensor using the demodulation circuits are provided. The demodulation circuits can include circuitry configured to determine an adjustable phase delay based at least in part on a quadrature component of the touch signal or the phase-adjusted touch signal. The demodulation circuit can further include circuitry for applying the adjustable phase delay to the touch signal to compensate for phase delays in the touch signal caused by the touch sensor and/or other components. The demodulation circuit can dynamically change the adjustable phase delay to compensate for time-varying phase delays caused by the touch sensor and/or other components.
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