Circuit for capacitive touch applications
US8970227B2 · kind B2 · utility
3Cited by
10References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2010 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Dec 13, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/46
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for capacitive touch applications has a charge integrator, a low pass-filter, and a correlated double sampler having an input capacitor. The circuit also includes a sampler and holder, and an analog to digital converter. The low pass-filter has a cut-off frequency lower than the Nyquist frequency of the sampler and holder, and the low pass filter includes input capacitor and a serial resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.