Capacitive sensing system and method
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United States of America Patent
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Nov 14, 2017
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Jun 11, 2014
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Jun 11, 2013
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Abstract
A capacitive sensing system operates according to a method which uses an ADC. The analog signal to be digitized is modulated with a triangular or saw-tooth modulating signal, so that a modulated analog signal is obtained, which is sampled with the ADC. The triangular or saw-tooth signal is chosen to have a peak-to-peak amplitude corresponding at least approximately to an integer multiple L, with L≧1, of the quantization step size of the ADC. The saw-tooth or triangular signal has a number M, of periods per each sequence of N samples. M and N are chosen such that M>1 and M≠N and such that R=r*N/(k*gcd(N, M)*L), where gcd(M, N) is the greatest common divisor of N and M and where k=2 if the modulating signal is a saw-tooth signal and k=4 if the modulating signal is a triangular signal.
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