dt_banme
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FineSim Spice is a spice simulator, it works very well for top level simulation on small to average analog/mixed-signal circuits, ~ 200K-300K devices, especially if the mixed signal design has very high content of analog. I haven't try on designs with higher transistor count yet. The accuracy is at full spice accuracy level.
If you are running with parallel processing using 4-8 core system, it will be a few times faster than a typical fast spice simulator. It's fully compatible with Hspice and doesn't require much setup. The default works fine for most analog circuits.
In general Hsim/NanoSim/UltraSim are more suitable for large mixed-signal designs with high digital content, post layout verification and memory.
I hope this will help.
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