Linear capacitance detection circuit
US6456477B1 · kind B1 · utility
12Cited by
10References
22Claims
0Family size
Inventors
Key dates
| Filing date | Jan 13, 2000 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Jan 13, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB81B2203/0392
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A differential transconductance amplifier detects changes of the variable capacitor in a low-impedance, bridge circuit and feeds back current to balance the bridge. The voltage that controls the feedback current is proportional to capacitance over a wide dynamic range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.