In Reply to: Hi Andy posted by Charles Hansen on April 8, 2007 at 10:12:02:
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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Follow Ups
- Thanks Charles - andy_c 11:17:11 04/09/07 (12)
- Re: Thanks Charles - Charles Hansen 17:40:24 04/09/07 (11)
- Transistors' dirty little secret... - Al Sekela 12:51:40 04/10/07 (10)
- Now you've got me curious - Charles Hansen 20:06:11 04/10/07 (2)
- Re: Now you've got me curious - Ozzie 10:44:35 04/17/07 (0)
- No, it doesn't reduce capacitance, just the parasitic resistance. - Al Sekela 09:51:18 04/11/07 (0)
- Re: Tubes' dirty little secret... - Charles Hansen 19:58:20 04/10/07 (6)
- Re: Tubes' dirty little secret.. (psst, they work too) - tomservo 18:23:23 04/12/07 (3)
- Re: Tubes' dirty little secret.. (psst, they work too) - nightdoggy 04:39:38 04/13/07 (2)
- Re: Tubes' dirty little secret.. (psst, they work too) - morricab 02:02:25 04/17/07 (1)
- uh...everything wears out....doesn't it? nt - TomLarson 20:26:30 04/17/07 (0)
- Must be why they can sound so good! (nt) - nightdoggy 18:20:05 04/11/07 (0)
- Re: Tubes' dirty little secret... - GGA 10:12:41 04/11/07 (0)