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Thanks Charles

The "memory distortion" thing is interesting. I'm sure I haven't seen all the literature on this, but what I have seen seems somewhat speculative.

There are some new simulation models for BJTs that support the concept of the instantaneous junction temperature changing within a simulation, even being different from one time step to the next in a transient simulation. One of these is VBIC and the other is the Philips Mextram. Parameter extraction for these looks like a nightmare though. None of the free or reasonably priced simulators have full support of these models either. LTSpice supports VBIC but not the idea of the junction temperature changing within a sim.

Still it would be interesting to see someone who doesn't have an agenda do a thorough study of the phenomena using such tools. Maybe some college guy will step up to the plate :-).

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