Soft Guard—A Method of Trimming Resistors in Closed Loops

Abstract

The automatic laser trimming of resistors is highly developed, but some areas of application still allow improvements. The method described is a new development for trimming resistor networks. When resistors within a network have to be trimmed, the influence from the other resistors has to be compensated in order to obtain a correct measurement (e.g, π‐network). Normally this is achieved with an Active Guard circuit, but new generation laser trimmers also offer an entirely mathematical compensation called Soft Guard.

Citation

Lenk, P. (1990), "Soft Guard—A Method of Trimming Resistors in Closed Loops", Microelectronics International, Vol. 7 No. 1, pp. 22-27. https://doi.org/10.1108/eb044397