Method and apparatus for trimming resistors

Details Method and apparatus for trimming resistors Method and apparatus for trimming resistors

1978-08-07

1980-05-06

Albritton, C. L.

Electrical resistors

Mechanically variable

Resistance value varied by removing or adding material

29620, 338308, H01C 1000

Patent

active

042019702

ABSTRACT:
A plurality of current paths, each operating a fusible link, is connected between a common first terminal and different points along a resistor whose value is to be trimmed. By applying a constant voltage between this common terminal and a second terminal at one end of the resistor, fusible links in one or more of successive ones of the paths open, effectively placing successively greater values resistance between the first and second terminals, thereby successively reducing the amount of current flow between these terminals. When the current drops to lower than a given value, no further links open and the value of the resistance between the terminals is in the desired range.

REFERENCES:
patent: 2399753 (1946-05-01), McLarn
patent: 3028659 (1962-04-01), Tsing Chow et al.
patent: 3422386 (1969-01-01), Helgeland
patent: 3431640 (1969-03-01), Larsson
patent: 3453727 (1969-07-01), Touw et al.
patent: 3776040 (1973-12-01), Gould
patent: 3803708 (1974-04-01), Wada et al.
patent: 3947801 (1976-03-01), Bube

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