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Re: MCP6291 model won't run

 

I have tried setting the Cshunt option, but it does not help until I get to 50fF. ?In fact, when I cascade a couple sections I have found it needs to be as high as 70fF. ?I have also tried 700fF, which does not seem to affect the result much, so perhaps a setting of 70fF would still provide a valid solution but I wonder why 0.5fF does not work for me. ?I would appreciate your thoughts on that.

Thanks,

Tim

From: John Woodgate
To: LTspice@...
Sent: Sunday, January 5, 2014 2:01 PM
Subject: Re: [LTspice] RE: MCP6291 model won't run

?
In message , dated Sun, 5 Jan 2014,
helmutsennewald@... writes:

>There is a simple reason for that. LTspice doesn't find the operating
>point with "DC"-algorithms.

I'm sure there is a good reason for that, but it's not obvious.

>Thus it finally tries with the pseudo transient simulation. You can
>watch this in the lower status bar.

Thanks for the tip. One might have thought that it would try DC
algorithms, at least as a last possibility.
--
OOO - Own Opinions Only. With best wishes. See
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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