Methods of and apparatus for trimming film resistors

Details Methods of and apparatus for trimming film resistors Methods of and apparatus for trimming film resistors

1980-10-30

1983-04-26

Reynolds, B. A.

Electric heating

Metal heating

By arc

219121L, 219121LH, 219121LM, 338195, B23K 2600

Patent

active

043814417

ABSTRACT:
A hybrid integrated circuit (121) is coupled to an adapter circuit (151) to facilitate trimming of film resistors (126, 127, 128 and 129) formed on the hybrid circuit. The adapter circuit (151) includes a plurality of safety resistors (156, 157 and 158) which are to be selectively added in series with the film resistor (126) to be trimmed. A computer (145) facilitates the measurement of (1) the resistance of the untrimmed film resistor (126) and (2) the gain of the hybrid circuit (121). Depending upon the measured gain, the safety resistors (156, 157 and 158) are selectively added in series with the film resistor (126) to establish a basic resistance value. Thereafter, the film resistor (126) is trimmed by a laser (144) until the resistance value of the film resistor (126) is equal to the basic resistance value. Other safety resistors are used during the trimming of the remaining resistors (127, 128 and 129).

REFERENCES:
patent: 3585338 (1971-06-01), Rosenthal
patent: 3699649 (1972-10-01), McWilliams
patent: 3916142 (1975-10-01), Ennis
patent: 3930304 (1976-01-01), Keller et al.
patent: 4146867 (1979-03-01), Blangeard et al.
patent: 4150366 (1979-04-01), Price
patent: 4182024 (1980-01-01), Cometta
patent: 4184062 (1980-01-01), Schmidt
patent: 4191938 (1980-03-01), Gow et al.
Bojman and Palfi, "Trimming Resistors in Closed Loops", Apr. 1970, IBM Technical Disclosure Bulletin, p. 1787.
Greenman, Kapushoc, Reichert, "Pulsed High-Voltage Resistor Trimmer", Sep. 1967, IBM Technical Disclosure Bulletin, p. 371.

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