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Modeling >> Semiconductor Devices >> Eldo with Hspice Model
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Message started by Paul on Oct 28^th, 2003, 12:59am

Title: Eldo with Hspice Model
Post by Paul on Oct 28^th, 2003, 12:59am

Hi,

for the MOS transistors in the technology I use I have Hspice BSIM3V3 models (level 49). I would like to use the Eldo simulator to simulate my design, but Eldo only recognizes BSIM3V3 as level 53. Can I just change the level information in the model to use it with Eldo or are some of the parameters used differently by both simulators?

Thanks

Paul

Title: Re: Eldo with Hspice Model
Post by Geoffrey_Coram on Feb 13^th, 2004, 9:47am

You *should* be able to just change the level; however, you might or might not have a few other problems: does Eldo accept CJGATE and CJSWG (I think HSpice considers them aliases, but one isn't standard BSIM3), etc.

Title: Re: Eldo with Hspice Model
Post by Paul on Feb 16^th, 2004, 12:31am

Sorry,

I completely forgot to update this post as we got around the problem of getting different simulation results using Spectre (with Spectre model), Hspice and Eldo (same model, except level=53 for Eldo).

There is a paper on sourcelink which helped a lot:
BSIM3V3.X MOSFET MODEL COMPATIBILITY HSPICE LEVEL 49 -Spectre BSIM3V3.X
which explains the different ways of calculating source and drain parasitic capacitance for Spectre compared to Hspice. With respect to Eldo vs Hspice, the point to consider is that Hspice has one parameter defining the calculation of the related diffusion parasitics, while Eldo has several. So we had to be careful that both models are compatible on that point.
CJGATE is conditionnally used by Eldo, depending on the value of DCAPLEV. In our case, DCAPLEV has the default value and thus CJGATE is *not* used, but this doesn't seem to alter the simulation results with respect to Hspice results.

Thanks for your help.

Paul