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Transient simulation - varying accuracy

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I'm simulating two circuits together that have very different time resolution requirements (ms vs. ns). I need the first circuit to settle, which takes up to 100 ms. During this time, I'm happy just to completely ignore the other one (a ring oscillator). Is there a way to do this? I've read some forum posts on varying the errpreset, but that is not enough to solve this. I tried changing both minstep and maxstep, but I'm not sure whether it is possible to use minstep as dynamic parameter.

I'm happy for any pointer on this.

Kind regards,

Patrick


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