Receive demodulator for capacitive sensing
US8487639B1 · kind B1 · utility
17Cited by
238References
20Claims
0Family size
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Key dates
| Filing date | Nov 23, 2009 |
| Grant date | Jul 16, 2013 |
| Priority date | — |
| Expiry date | Jun 1, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960725
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A charge storage circuit stores charge from a current induced across a capacitive sensing device. The current across the capacitive sensing device is supplied to the charge storage circuit by a current conveying device to generate an output voltage signal. The presence of a conductive object proximate to the capacitive sensing device is detected based on the output voltage signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.