Capacitive touch sense architecture having a correlator for demodulating a measured capacitance from an excitation signal
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United States of America Patent
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Jan 2, 2018
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app pub date -
Mar 31, 2017
filing date -
Feb 25, 2011
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Abstract
An analog front end circuit utilizes coherent detection within a capacitance measurement application. The analog front end circuit uses coherent detection to measure capacitance of a touch screen display. An analog excitation signal is modulated by a capacitor to be measured. The modulated signal is synchronously demodulated using a correlator, which includes a discrete mixer and a discrete integrator. The excitation signal is also input to the mixer such that the modulated signal is multiplied by the excitation signal. The excitation signal is an analog signal having a sine wave function or other waveform.
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