Electric resistor having positive and negative TCR portions

Details Electric resistor having positive and negative TCR portions Electric resistor having positive and negative TCR portions

1994-12-09

2000-08-01

Easthom, Karl

Electrical resistors

Resistance value temperature-compensated

With additional compensating resistor or resistance element

338 22R, 338320, 338308, 338309, H01C 706

Patent

active

060972769

ABSTRACT:
A description is given of a precision resistor. The resistor comprises a substrate having two connections which are electrically interconnected via a resistance path, said resistance path comprising a first path portion having a positive TCR and a second path portion having a negative TCR. The resistor is characterized in that the resistance material of both path portions is selected so that the resistance values and the absolute TCRs of both path portions are comparable and in that both path portions are trimmed so that the resistor has desired resistance and TCR values. Preferably, the resistance materials used for the path portions consist of an alloy of substantially the same composition on the basis of CuNi or NiCrAl. The invention makes it possible to very accurately and reproducibly mass-produce precision resistors.

REFERENCES:
patent: 2050703 (1936-08-01), Johnson
patent: 3577209 (1971-05-01), Perkins
patent: 4079349 (1978-03-01), Dorfeld
patent: 4104607 (1978-08-01), Jones
patent: 4413170 (1983-11-01), Val et al.
patent: 4746896 (1988-05-01), McQuaid et al.
patent: 4791276 (1988-12-01), Midgley et al.
patent: 4907341 (1990-03-01), Chapel et al.
patent: 5039976 (1991-08-01), Drabkin
patent: 5088329 (1992-02-01), Sahagen
patent: 5448103 (1995-09-01), de Wit
Dummer, "Materials For Conductive and Resistive Functions", pp. 16-17 (ed. by A. Javitz, 1970).

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