Front-end signal detector and method for improving noise immunity of a capacitive touch sensor
US8487907B2 · kind B2 · utility
7Cited by
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9Claims
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Key dates
| Filing date | Aug 5, 2010 |
| Grant date | Jul 16, 2013 |
| Priority date | — |
| Expiry date | Jan 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A front-end signal detector and a method for improving noise immunity of a capacitive touch sensor start counting a preset time to trigger an interrupt signal responsive to a positive or negative edge of a periodic noise, to break the path through which a demodulated signal comes into a low-pass filter, to prevent noise from accumulating in the low-pass filter, and consequently mitigate the influence of the noise on the detection signal generated by the front-end signal detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.