0.18um cmos model file

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jason - 09 Mar 2005 16:21 GMT

Hello All

I am a beginner in simulator.
Anyone can show me how to make sure the part and model file I use in my
LTspice and Pspice is for 0.18um cmos technology?
How to modify it? I just installed them on my computer and do not know
how to modify it.
Kindly help.

rgds and thanks
jason

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Jim Thompson - 09 Mar 2005 16:24 GMT

>Hello All
>
[quoted text clipped - 7 lines]
>rgds and thanks
>jason

You need a model file from the specific foundry/fab you are using.

...Jim Thompson

I love to cook with wine. Sometimes I even put it in the food.

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jason - 10 Mar 2005 04:12 GMT

Thanks Jim

Let's say I choose a TSMC 0.18um cmos technology.
Where can I get the model file from?
And which folder I should put it into my software in order to simulate
circuit?
Kindly enlighthen
Thank you

rgds
jason

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Jim Thompson - 10 Mar 2005 14:48 GMT

>Thanks Jim
>
[quoted text clipped - 7 lines]
>rgds
>jason

This sounds very student.

Your university should have a device LIBRARY file (*.lib) for that
process.

Your simulator set up tab (location is dependent on which simulator
you are using) should help you define where it's located (directory)
and how to invoke the process corners.

...Jim Thompson

I love to cook with wine. Sometimes I even put it in the food.

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jason - 11 Mar 2005 16:03 GMT

Yes Jim. I am student. Thanks a lot for being active and kind in
responding to many enquiries.
By the way, say if I simulate a circuit in Pspice or LTspice, then can
I generate something like a netlist from any simulator I used and then
I switched to other simulator for layout using the netlist, will this
work?
This simply means I wish to know if the netlist for any simulator can
be cross functioned at other simulator?
Kindly advise
Thanks a lot

Jason

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Jim Thompson - 11 Mar 2005 16:22 GMT

>Yes Jim. I am student. Thanks a lot for being active and kind in
>responding to many enquiries.

You are quite welcome.

>By the way, say if I simulate a circuit in Pspice or LTspice, then can
>I generate something like a netlist from any simulator I used and then
>I switched to other simulator for layout using the netlist, will this
>work?

Not generally without some editing.

However, in PSpice, you have multiple netlisting templates. So I
have...

Template for PSpice Simulation, includes calculated AD, AS, ...

Template for Layout, has L and W only

Template suitable for importation into Silvaco SmartSpice (essentially
HSpice style parametric syntax)

>This simply means I wish to know if the netlist for any simulator can
>be cross functioned at other simulator?
>Kindly advise
>Thanks a lot
>
>Jason

As I said above, not generally without some editing.

I HAVE used LTSpice to run a PSpice-generated netlist, without
problem. I don't know, however, if LTSpice has multiple-template
capability. Mike?

...Jim Thompson

I love to cook with wine. Sometimes I even put it in the food.

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jason - 13 Mar 2005 02:40 GMT

Hi Jim

Thanks a lot again for the advice. That really gives me some idea about
layout using the various spice platform.
Could I ask you about making a circuit with frequency oscillation at
2.4Ghz?
Thanks a lot

rgds and thanks
Jason

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Jim Thompson - 13 Mar 2005 16:59 GMT

>Hi Jim
>
[quoted text clipped - 6 lines]
>rgds and thanks
>Jason

Are you asking if it's possible to make a 2.4GHz VCO on 0.18um CMOS?
Yes.

...Jim Thompson

I love to cook with wine. Sometimes I even put it in the food.

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jason - 14 Mar 2005 08:45 GMT

Hi Jim

Need your help again.
Say if I never change the model file of my LTspice. Then what model
file will the simulator use as a default? A discrete model I heard.
What actually the tsmc0.18um model file and the discrete model file
different in?

Then if I wan to put new model file in LTSpice. Then I should go to
program files->LTC->cmp->standard mos folder and change the model
files. Am I right?
Please tell me this in detailed if I am wrong.

Just a stupid question, if I make a circuit to run well in LTspice ,
then if I have no way to make layout from Ltspice. Can I just go to
Pspice and insert the circuit and model file. Then I will be able to
get the same result and then the layout can be made. This will work
right?

Thank you Jim
Anyone who knows well, pls comment too.

rgds and thanks
Jason

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Jim Thompson - 14 Mar 2005 17:05 GMT

>Hi Jim
>
[quoted text clipped - 20 lines]
>rgds and thanks
>Jason

PSpice only interfaces to PCB layout NOT microchip layout.

As to LTSpice model files, Mike Engelhardt will have to jump in here.

...Jim Thompson

I love to cook with wine. Sometimes I even put it in the food.

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jason - 15 Mar 2005 01:21 GMT

Thanks Jim
Then I will wait for Mike then
By the way Jim, is it true that nowadays capacitor and inductor still
cannot be fabricated together with digital and analog circuit in the
same chip?
So the layout for an oscillator circuit is better to use pcb layout or
chip level layout?
I am not sure if I express what I am in doubt
Kindly enligthen
Thanks a lot

Jason

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Chris Jones - 20 May 2005 23:34 GMT

Jason,

At 2.4GHz, the inductors and capacitors are actually easier to use on-chip
than off-chip, since the parasitics are less of a problem. You'll need a
good model for your inductor, I suggest the free programs FastHenry and
FastCap from MIT as a starting point, though they simulate inductance and
capacitance separately so you'll have to do some work to make a good
distributed model. Also for decent inductors you'll want a metal layer at
least 2um thick, preferable 5um or more. You could also strap several thin
metal layers together, but the USPTO was silly enough to let someone patent
that.(5446311)

If you have access to the IEEE Journal of Solid State Circuits, you'll find
that since 1995 or so it has printed many VCO papers. This should be of
interest to you.

Chris Jones

> Thanks Jim
> Then I will wait for Mike then
[quoted text clipped - 8 lines]
>
> Jason

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jason - 10 Mar 2005 04:12 GMT

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Electronics Forum / CAD / May 2005

0.18um cmos model file