Without seeing the models, I'm guessing that the model uses the "bjt" device in Spectre. If you run (from the UNIX command line): spectre -h bjt then scroll to the Operating Point Parameters section, you'll find: 17 ro (Ohm) Common-emitter output resistance. as well as the other parameters. Info can also be found in the Spectre Circuit Simulator Components and Device Models Reference manual, near the end of the chapter. Andrew
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