High resolution sigma delta modulator for capacitance sensor terminal displacement measurement
US9628104B2 · kind B2 · utility
3Cited by
11References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2015 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Jun 16, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/376
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A single plate capacitance sensor includes a sensor capacitor and a reference capacitor that share common plate. A capacitance-to-digital sigma delta modulator provides separate sensor excitation and reference excitation signals to the sensor capacitor and the reference capacitor to provide high resolution detection. Programmable ratio-metric excitation voltages and adaptive excitation voltage sources can be used to enhance modulator performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.