Abstract
This paper describes the design, implementation and performance of a flat edge-based circuit extractor for NMOS circuits. The extractor is able to work on large and complex designs, it can handle arbitrary geometry, and outputs a comprehensive wirelist. Measurements show that the run time of the edge-based algorithm used is linear in size of the circuit, with low implementation overheads. The extractor is capable of analyzing a circuit with 20,000 transistors in less than 30 minutes of CPU time on a VAX 11/780. The high performance of the extractor has changed the role that a circuit extractor played in the design process, as it is now possible to extract a chip a number of times during the same session.

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