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https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> minr in Spectre https://designers-guide.org/forum/YaBB.pl?num=1119896226 Message started by Sid on Jun 27th, 2005, 11:17am |
Title: minr in Spectre Post by Sid on Jun 27th, 2005, 11:17am Hi, I have very large MOSFETs in my DC-DC converter circuit. This results in the MOSFETs having a resistance less than 50 milli ohms. Now, Spectre does not consider these resistances since they are less than minr value. But I want it to simulate WITH these resistances included. How do I change the minr parameter? Thanks, Sid |
Title: Re: minr in Spectre Post by Geoffrey_Coram on Jun 30th, 2005, 5:24am I believe you may have to set "minr=1e-3" in the model card for the large device(s). This could be a nuisance if you have lots of model cards. There is a simulator option simOptions options minr=1e-3 but I think the local one (in the model card, which has a larger default) is applied first, without checking the global value. |
Title: Re: minr in Spectre Post by Ken Kundert on Jun 30th, 2005, 7:51am Using small values for parasitic resistors can cause convergence problems. If this occurs, you will need to loosen iabstol. -Ken |
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