Controlled temperature coefficient thin-film circuit element

Details Controlled temperature coefficient thin-film circuit element Controlled temperature coefficient thin-film circuit element

1981-07-07

1984-08-07

Envall, Jr., Roy N.

Electrical resistors

Resistance value responsive to a condition

Ambient temperature

338 9, 338 22R, 338308, 338314, 338334, H01C 706, H01C 112

Patent

active

044646461

ABSTRACT:
To form a temperature sensor, for example suitable in an automotive vehicle, to determine ambient temperatures, or to provide a temperature compensated thin-film circuit, for example for incorporation with an oscillator circuit, two stable thin-film layers are applied to a non-conductive substrate, the layers being capable of being etched. The overall temperature coefficient of resistance can be matched to a predetermined value by selective interconnection of at least two thin-film resistance elements formed by the thin films, of which one thin film resistance element for example comprises a nickel layer over a tantalum base, with a predetermined temperature coefficient of resistance, the other resistance element merely being the tantalum layer with essentially zero temperature coefficient of resistance, the overall temperature coefficient of resistance of the combination being determined by adjustment of the relative resistance values after measurement of the temperature coefficient of resistance of the nickel-tantalum layer to determine its actual temperature coefficient so that, in spite of tolerances in the manufacture of the thin films, interchangeable elements of highly accurate overall resistance and temperature coefficient of resistance values can be obtained.

REFERENCES:
patent: 3199050 (1965-08-01), Schleenbecker
patent: 3513411 (1968-01-01), Everhart
patent: 4019168 (1977-04-01), Collins
patent: 4079349 (1978-03-01), Dorfeld
patent: 4104607 (1978-08-01), Jones
patent: 4172718 (1979-10-01), Menzel

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