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  3. Zener modeling app stuffs wrong implementation in part,...

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Zener modeling app stuffs wrong implementation in part, probably due to Pspice model clean up

Glenn Doiron
Glenn Doiron over 3 years ago

I was running S013 and received a new PC.  I reinstalled S013 at the time and copied my old Cadence directory over to the new machine.

Well it was time to go back to an old board I had started work on when I had the previous machine, and Pspice was complaining it couldn't find the "zener" model in my netlist.

I checked my Pspice configuration, and breakout.lib was already configured as one of the libraries.  I checked the breakout.lib and there is no "zener" or "dbreakz" in it.  Figuring that I might have messed something up during the machine upgrade (or maybe possibly somehow deleted it accidentally), I decided to uninstall, rename the SPB_174 directory to OLD_SPB_174, and did a fresh install of S027 (Orcad, Sigrity2019, CIP client, and the Pspice library).

It was still complaining about the missing "zener" model.  I re-modelled the zener diode with the modelling app, and sure enough, the new part it generates still has an Implementation property of "zener".  Opening the new breakout.lib reveals there is now a "zener_parameterized" model available.  Manually changing the implementation to "zener_parameterized" allows Pspice to simulate the circuit correctly.

I don't know what happened to the zener model, but it was apparently changed at some point to zener_parameterized, and the modelling app wasn't updated for the new change.

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