Kundert Chapter 1

Kundert Chapter 1 - Excerpted from "The Designer's...

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Chapter 1 Circuit Simulation 1.1 Historical Perspective Circuit simulators, as we know them today, frst began to appear in the late 1960’s and early 70’s. However, it was the explosive growth oF the integrated circuit market in the 1970’s that precipitated the rise oF importance oF circuit simulation. With integrated circuits, proto- types were expensive to build and difficult to troubleshoot. Circuit simulators were necessary to evaluate designs beFore they were Fab- ricated. As designs became larger and more complicated, the need to use circuit simulators increased. Two groups contributed signifcantly to the development oF the mod- ern circuit simulator. The Astap group at IBM developed many oF the numerical method’s used. And the Spice group at the Univer- sity oF CaliFornia at Berkeley developed and propagated the de Facto standard simulator. The simulation e±ort at Berkeley started as a class project oF ProF. Ron Rohrer. That modest beginning resulted in a flurry oF simulation programs being developed and culminated in the release oF Spice in 1972 and then Spice 2 in 1975. Spice was written by Larry Nagel, then under the guidance oF ProF. Don Pederson. Spice became very important For three reasons. ²irst, Spice wasdes ignedtobeusedto simulate integrated circuits. Unlike the simulators that preceded it, Spice had all the models one needed to simulate integrated circuits built into it. As such, it was easier to use than earlier simulators.
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2 Chapter 1. Circuit Simulation Second, the source code for Spice was made available to anyone who wanted it at a nominal cost. And third, Berkeley graduates took Spice with them as they went to work at electronics companies throughout the country. In the late 70’s and early 80’s, most versions of Spice were propri- etary and only used in-house by the integrated circuit manufacturers. At the time, it seemed as if every large electronics company in the
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Kundert Chapter 1 - Excerpted from "The Designer's...

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