Celsius electronic thermometer circuit
US4497586A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1982 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | May 17, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic Celsius thermometer circuit suitable for fabrication in integrated circuit form has an output directly related to the temperature scale. The zero crossing is created by subtracting a negative-temperature-coefficient voltage from a positive-temperature-coefficient voltage with one of the voltages being made adjustable and set to equal the other. The output response is set to provide the desired temperature scale. If desired the zero crossing and temperature scale can be set for Fahrenheit readings as well as for Celsius. A circuit improvement is also disclosed for compensating the thermometer for departures from linearity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.