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Saving Internal Junction Temperature of VBIC Bipolar Transistor Model

sgcad

Hi

I'm working with a SiGe BiCMOS technology where the PDK desribes the HBTs with a VBIC 1.15 model. To assess self-heating of transistors, I would like to save the internal junction temperature (or the temperature rise above ambient).

Do you know how to do this, in particular what's the name of the variable inside the model?

Looking at https://designers-guide.org/vbic/release1.2/vbic1.2.va.html, it seems dT or Tdev would be useful, but using a Spectre save statement for this (save Q10:Tdev Q10:dT) does not work (No such output parameter, terminal, or internal node name.). But then the above Verilog-A model is much older than 1.15.

Any ideas? Thanks very much.

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