Cermet resistor trimming method

Details Cermet resistor trimming method Cermet resistor trimming method

1978-07-03

1980-03-04

Albritton, C. L.

Electrical resistors

Mechanically variable

Resistance value varied by removing or adding material

29620, 219121LM, 338308, H01C 1000

Patent

active

041919386

ABSTRACT:
A method for laser trimming of resistors which includes sputter depositing or vaporizing resistor material in a limited area but the resistor geometry and trimming location is designed to achieve a maximum resistor trimming range with a minimum substrate area occupied by the resistor. A cermet resistor is fabricated on a metallized ceramic substrate with the resistor having a low length to width ratio. A laser cut is used to provide resistor values greater than 250 ohms and up to 16000 ohms.

REFERENCES:
patent: 3573703 (1971-04-01), Burks et al.
patent: 3768150 (1973-10-01), Buie
patent: 3864825 (1975-02-01), Holmes
patent: 3916144 (1975-10-01), Schuermann
patent: 3947801 (1976-03-01), Bube
H. S. Hoffman et al., IBM Technical Disclosure Bulletin, "Thin Film Resistor Design", vol. 21, No. 6, Nov. 1978, pp. 2279-2280.

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