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HSpice is more popular in industry because of its more transistor models support. Some devices are not supported in pspice. I don't think they (hspice and pspice) have the same core. In algorithm convergency, hspice still have some problem. Nassda Hsim is better in this aspect. I simulated some large digital circuit in hspice and hsim in transistor level. hspice cann't finish while hsim can when the transistor number exceeds a certain quantity.
ckt.designer mentioned "When the drain/source areas and perimeters are mentioned in HSPICE, it will calculate the parasitic capacitances and takes them into account for the analysis and simulation of the results."
In Pspice you also can set up the parameters AS,AD, PS and PD for the drain/source diffusion areas and perimenters. HSpice has more parasitic capacitances than Pspice accounted