CIRCUIT FOR CAPACITIVE TOUCH APPLICATIONS
First Claim
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1. A circuit for capacitive touch applications comprisinga charge integratora low pass-filtera correlated double sampler comprising an input capacitora sampler and holderan analog to digital convertersaid low pass-filter having a cut-off frequency lower than the Nyquist frequency of the sampler and holder,said low pass filter comprising said input capacitor and a serial resistor.
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Abstract
A circuit for capacitive touch applications comprising
- a charge integrator
- a low pass-filter
- a correlated double sampler comprising an input capacitor
- a sampler and holder
- an analog to digital converter
- said low pass-filter having a cut-off frequency lower than the Nyquist frequency of the sampler and holder
- said low pass filter comprising said input capacitor and a serial resistor.
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Citations
24 Claims
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1. A circuit for capacitive touch applications comprising
a charge integrator a low pass-filter a correlated double sampler comprising an input capacitor a sampler and holder an analog to digital converter said low pass-filter having a cut-off frequency lower than the Nyquist frequency of the sampler and holder, said low pass filter comprising said input capacitor and a serial resistor.
Specification