Bilateral zener trim

Details Bilateral zener trim Bilateral zener trim

1983-04-19

1984-05-29

Wojciechowicz, Edward J.

357 51, 357 52, 357 55, 357 86, H01L 2990

Patent

active

044518390

ABSTRACT:
In an integrated circuit, back to back zener diodes are connected between circuit pads and each zener diode shunts a resistor in a series string. When a suitable pulse is applied to the pair, the back biased diode will be selectively shorted. Thus, the pulse polarity will determine which diode will short and which resistor will be bypassed. In this manner a pair of pads can be used to selectively short out either one or both of a pair of diodes and a trimming section can be created using only half of the pads required in the case where each zener is contacted separately. The invention is directed to a structure in which the forward biased zener diode is protected so that only the reverse biased diode shorts out when the pulse is applied.

REFERENCES:
patent: 3932879 (1976-01-01), Pace

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