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Hello All,

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I am trying to use a HSPICE model (level=49)?that comes from the foundry. I didn't make any changes in the library file (the .l file) and used it directly in LTSPICE.? However, the results didn't look right when I compared it to the PSPICE.? The library I used for PSPICE was converted from the same HSPICE library and we have used the PSPICE library for several IC designs.? I assume the PSPICE library is correct.? The difference happens when I use the transistors in a specific bin.? For example, the calculated VTH is quite different.

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What changes should I make before using HSPICE model in LTSPICE?

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I looked at the error log file in LTSPICE.? It just showed the following warnings:

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Ignoring BSIM parameter CALCACM

Ignoring BSIM parameter SFVTFLAGl

Ignoring BSIM parameter VFBFLAG

Ignoring BSIM parameter XL

Ignoring BSIM parameter XW

Ignoring BSIM parameter TLEV

Ignoring BSIM parameter TLEVC

Ignoring BSIM parameter HDIF

Ignoring BSIM parameter LDIF

Ignoring BSIM parameter ACM

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Thanks.

I think we need to change the model a bit before?enable it to work with LTSPICE, but I don't know how.? I compared, for example, the Id vs Vds?simulation, with?the manual from the vendor,?and did see the difference.

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Hello,

LTspice should recognize the model 49. Thus don't change anything in the original model.

Normally you can ignore the warning from LTspice about "overdue" parameters.

Jim has written a small a paper about differences between HSPICE and PSPICE.

http://www.analog-innovations.com/

http://www.analog-innovations.com/HSpice2PSpiceNewEdit.pdf

Normally LTspice is highly compatible with PSPICE.LTspice assumes the unit m(meter) for length. maybe HSPICE assumes um(mircometer) in your simulation.

Best regards,

Helmut

Helmut,

I tried ltspice and pspice?for a while.? Basically I simulated Id vs Vds for a pmos.? I noticed significant difference? between the ltspice result and the vendor manual.? The pspice? results (we converted hspice models to pspice models and used the pspice models in many actual design) agree with the manual well.? My friend has access to hspice.? He did the same simulation in hspice directly and told me the simulation results are close to the manual.

We did all the simulation for tsmc 0.25 um process, but I cannot share any model information here.

Thanks.

tried ltspice and pspice?for a while.? Basically I simulated Id vs Vds
for a pmos.? I noticed significant difference? between the ltspice
result and the vendor manual.? The pspice? results (we converted hspice
models to pspice models and used the pspice models in many actual
design) agree with the manual well.? My friend has access to hspice.?
He did the same simulation in hspice directly and told me the
simulation results are close to the manual.

We did use converted models in pspice, but not in ltspice.? In ltspice, we used the (hspice) models provided by the vendor directly.

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I cannot post any model files here, but my simulation circuit if it helps.

---In LTspice@..., <oldeagleusa> wrote:

I cannot post any model files here, but my simulation circuit if it helps.

Jim,

Thanks for the reply.

Yes,?pspice doesn't support binning.? Part of reasons we converted hspice model to pspice model was because of this.

From what I learned from Mike Engelhardt, ltspice does support binning.