New U‐Cut Algorithmic Trimming for Lightning Protection

Abstract

Large ohm film resistors that guard sensitive telecommunication devices against the hazards of lightning require a set of exacting characteristics for tolerance, endurance, and productivity. These characteristics largely depend on how the resistor is trimmed. Conventional laser trimming is unable to provide all the requirements for this important resistor application. A new technique developed by Teradyne Inc. called Algorithmic Trimming employs an algorithm and data base to calculate real‐time trim vectors that are used in a trimming hardware processor to overcome the drawbacks of conventional trimming. With this new technique 50‐ohm film resistors were trimmed to specification with 0·1% tolerance while attaining high resistor stability and a trim time of 300 milliseconds.

Citation

Lejeune, B. (1986), "New U‐Cut Algorithmic Trimming for Lightning Protection", Microelectronics International, Vol. 3 No. 3, pp. 12-14. https://doi.org/10.1108/eb044240