January 4, 2007 -- Spice users can run into two types of problems with op-amp models: They need a model that is unavailable in their Spice library, or their library model may produce inaccurate simulation results for their application conditions. This article presents a new op-amp macromodel that makes it easy for any Spice user to create a model for any op amp just by entering parameters from the data sheet. This new macromodel has several advantages over conventional models. It greatly simplifies the creation of new op-amp models, it simplifies the addition of model enhancements and features, and it is more accurate than many other op-amp models.

By Ray Kendall. (Kendall is a principal engineer at Intuitive Research and Technology Corp.)