Capacitance sensor with sensor capacitance compensation
US8154310B1 · kind B1 · utility
32Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2009 |
| Grant date | Apr 10, 2012 |
| Priority date | — |
| Expiry date | Apr 4, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/960725
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A capacitance sensing circuit may include a capacitive sensor configured to conduct a sensor current, a current source for supplying a compensation current to the capacitive sensor, and a current mirror that generates a mirror current based on a compensated sensor current, where the compensated sensor current represents a difference between the compensation current and the sensor current. A measurement circuit generates an output signal corresponding to the capacitance of the capacitive sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.