Receive demodulator for capacitive sensing
US8575947B1 · kind B1 · utility
8Cited by
239References
20Claims
0Family size
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Key dates
| Filing date | Jan 11, 2013 |
| Grant date | Nov 5, 2013 |
| Priority date | — |
| Expiry date | Jan 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960725
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A first integration capacitor stores charge from a positive signal portion. A second integration capacitor stores charge from negative signal portion. The voltage across the first and second integration capacitors is measured differentially. The presence of a conductive object proximate to a capacitance sensing element is detected based on the measured differential voltage between the first and second integration capacitors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.