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Simulators >> Circuit Simulators >> Need for a BJT model
https://designers-guide.org/forum/YaBB.pl?num=1242208562

Message started by jqjqjq on May 13^th, 2009, 2:55am

Title: Need for a BJT model
Post by jqjqjq on May 13^th, 2009, 2:55am

Hello everyone,
These days, I'm simulating a circuit and I found I didn't have models for npn and pnp transistors. I wonder who know how can get them or anyone can give me some help. Thanks in advance.
Best wishes.

Title: Re: Need for a BJT model
Post by buddypoor on May 13^th, 2009, 3:45am

I wonder which simulator engine you are using because all simulators I know have suitable models for BJT´s. Change your program package to PSpice, Microcap, SwCAD, Hspice, Superspice, PSIM, ... ..

Title: Re: Need for a BJT model
Post by jqjqjq on May 13^th, 2009, 4:41am

Oh, thank you for your help. The software I used is Cadence. It has npn and pnp, but I wonder if it has any model for them?

Title: Re: Need for a BJT model
Post by pancho_hideboo on May 13^th, 2009, 11:22am

jqjqjq wrote on May 13^th, 2009, 4:41am:

The software I used is Cadence. It has npn and pnp, but I wonder if it has any model for them?

There is no tool which name is Cadence.
There are many simulators working in Cadence ADE.

Do you mean Cadence Spectre ?
Your purpose is just exercise of designing circuits using BJT ?
If so, use "$CDS_INST_DIR/tools/dfII/samples/artist/models/spectre/rfModels.scs".

You can find other model files in "$CDS_INST_DIR/tools/dfII/samples/artist/models/spectre"

If you want to do exercise of both circuit simulation and physical design using PDK, use gpdk180 or gpdk90 which Cadence provide as example of CMOS PDK.
https://pdk.cadence.com/home.do

Title: Re: Need for a BJT model
Post by jqjqjq on May 14^th, 2009, 10:50pm

Thank you very much for your advices,pancho_hideboo.
I feel very sorry that I'm still a beginner in this domain, I
mean, the analog design, especially using computer software.

Yesterday, I just finished the registration on pdk.cadence.com,
where I found many downloadable files, which seemed very similar
to the files I downloaded some days ago from NCSU's website.But I
don't know how to use them. I wish every suggestion you could
give me. Thank you very much.

Nowadays, I just want to do exercise of designing circuits using
BJT and MOSFET, with technology problems regardless.I'll try the
files you suggested to me. Thanks.

Please forgive any syntactic error in my words. I'm not from
English speaking country.