Sensing apparatus including an A/D conversion circuit for detecting a physical quantity
US6307496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Oct 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D3/0365
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An analog multiplexer is provided to time divisionally process a reference signal Sa obtained from a reference voltage generating circuit, a temperature signal St obtained from a temperature detecting bridge circuit, and a sensor signal Sd obtained from a pressure detecting bridge circuit. These signals Sa, St and Sd are converted into digital data through a common differential amplification circuit and a common A/D conversion circuit. A correction circuit calculates an applied pressure value based on the digital data produced from the A/D conversion circuit, as a value corrected with reference to the temperature signal St and the reference signal Sa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.