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From: Terry Pinnell
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: Wed, 20 Nov 2002 20:40:09 +0000
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NNTP-Posting-Date: Wed, 20 Nov 2002 20:40:24 +0000 (UTC)
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"fred bartoli" wrote:
>I don't know CM, but it should be the same as for generic spices.
>It's not that you have a sensitive circuit in your case but that you have a
>dual state one.
>The initial bias point can be whatever of both states, depending how the
>solver makes its way through the solution.
>The best answer to your *initial* bias point problem is to help the solver
>.NODESET control card that set the (some) node(s) into the right bias region
>at initial biaspoint computation,
>.IC that sets some initial conditions (caps and inductors)
>You also have some control words (OFF) that defines the initial states of
>semiconductors. Unfortunately the power mosfets models are macro models so
>this option is not available.
>You use the rampup option when you have convergence problems at the inital
>bias point. The reason it works is that the transient solver is more robust
>when it has converged on one solution, and the *all zero voltages* is an
>Please note that this will change nothing to the "no switching" problem.
Thanks Fred. I've been using .IC=0 on C1 throughout. Maybe I'll
experiment with .NODESET too. But that brief ramp up seems to have
sorted the indeterminancy.
See also my earlier post, including this link to latest results:
Hobbyist, West Sussex, UK
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