Unconnected part LTSpice seems to need (weird ...)

Joerg · 2011-08-14T22:33:20+00:00

Folks,This is close to voodoo but repeatable. Unfortunately I can't disclosethe schematic since it is for a client. Just wondering , anyone had thisbefore?At the far end of a TX line I used to have a diode connected acrossbecause a previous version of a chip would have such a substrat path.Nice waveforms, fast sims. Everything as expected and peachy. Now thenew iteration of the chip design won't have this diode path so I choppedoff its cathode connection. Sims fine. So I deleted the diode ->ka-crunch ... sim slows down and the ouput is junk.If I put the diode back in and connect only its anode -> fine. If Ileave the anode open and only connect the cathode it still sims but theresults are different.-- Regards, Joerg

Aug 14, 2011 81 Replies

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josephkk 14 years ago

disclose

this

path.

the

chopped

the

Thanks, i am glad that neither of us is all that crazy. I guess i only scared myself.

?-/

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Warren 14 years ago

Charlie E. expounded in news: snipped-for-privacy@4ax.com:

I have seen LTspice compain about a missing ground. But in other circuits the problem remained unreported. So this is likey a software correctness issue.

Warren

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