Celsius electronic thermometer circuit

Details Celsius electronic thermometer circuit Celsius electronic thermometer circuit

1982-05-17

1985-02-05

Frankfort, Charles

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

374178, G01K 700

Patent

active

044975864

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.

REFERENCES:
patent: 3809929 (1974-05-01), Vittoz
patent: 4004462 (1977-01-01), Dobkin
patent: 4063116 (1977-12-01), Schmoock
patent: 4071813 (1978-01-01), Dobkin
patent: 4207481 (1980-06-01), Dobkin
patent: 4284334 (1981-08-01), Magel
patent: 4348633 (1982-09-01), Davis
patent: 4350904 (1982-09-01), Cordell
patent: 4401898 (1983-08-01), Sommerer
S 7308-0028-Y, "Integrated circuit temperature controller" by Dance, Australian Electronics Engineering, Apr. 1976.

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