Compensated capacitive transducer demodulator circuit
US4289035A · kind A · utility
19Cited by
14References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1978 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Nov 30, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A compensation technique and network circuitry for a quad-diode demodulator and capacitive transducer combination is disclosed. The compensation method includes varying the amplitude of an alternating carrier frequency oppositely to the changes produced in that amplitude by the compensable errors in the demodulator and transducer. In one preferred embodiment ratiometric compensation and temperature compensation for the demodulator and any capacitive transducer is produced. In a second embodiment linearization and temperature compensation for the demodulator and a quartz capacitive transducer is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.