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Spice modeling has become commonplace today, especially with the advent of affordable PCs with more computing power than main frames of a few years ago.
A big concern in Spice modeling is the accuracy of the models. Without a good model, simulation results are little more than verification of rudimentary circuit operation. The Boyle operational amplifier (op amp) model introduced during the mid ‘70s came from the need for a model that did not use a lot of computing resources, and gave reasonable results for the µA741. In the years since, people have enhanced the Boyle model to add more accuracy.
Today, full-transistor models simulate with speed and accuracy on modest home systems. The goal, when creating the Spice model of the THS3001 high-speed monolithic operational amplifier, is to provide a model that will accurately simulate the actual device in a circuit. The model is derived from the full-transistor model used internally by TI design. Simplifications are made to speed simulation time, and various performance parameters are adjusted to match the model to measured device performance.
