New model parameter extraction environment for the submicron circuit models

A model parameter extraction system, called APEX (advanced model parameter extractor), is described. APEX provides the knowledge-assistant algorithm, which leads an optimizer to find optimal parameters automatically, and it also provides useful environments to obtain DC and AC parameters which guarantee good agreement with C-V data and the inverter chain delay, as well as I-V data. The experimental results using APEX show that optimal DC and AC parameter sets, including temperature parameters at different temperatures, can be easily and accurately obtained for the various sizes of transistors within a reasonable time.