Differential type capacitive sensor system
US5633594A · kind A · utility
27Cited by
8References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1995 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Nov 28, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a capacitive sensor system, first and second driving signals opposite in phase are applied to a sensor capacitor and a reference capacitor, respectively, which are both connected to a switched capacitor circuit. An output signal of the switched capacitor is sampled by two sample-and-hold circuits which are operated in different phases of the driving signals. A differential amplifier generates a sensor signal in response to the difference in potential between the outputs of the sample-and-hold circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.