Buffer circuit with differential structure for measurement of capacitive charges
US4609877A · kind A · utility
10Cited by
1References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 7, 1985 |
| Grant date | Sep 2, 1986 |
| Priority date | — |
| Expiry date | Nov 7, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a buffer with an operational amplifier having two inputs and two outputs and two feedback capacitances are inserted two other capacitances which in the measurement stage are switched in parallel to the feedback ones with opposite sign in such a manner as to cancel out the effects on the output voltage signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.