Re: [SI-LIST] : Sweeping Temp within MonteCarlo in HSPICE

alaa alani (alaa@lsil.com)
Tue, 2 Dec 1997 14:35:33 GMT

Hi Dmitri,

I understand now that sweeping parameters (incl. temperature) in Monte Carlo
yet generating one .tr and one .mt file is not possible. I guess the only
alternative is to sweep temp in the .trans statement and get the results from
more than one file (which was my original enquiry).

I 'm still hopeful that there will be a workaround in the next release!!

Rgds,

Alaa Alani
UK

> From si-list-approval@silab.Eng.Sun.COM Tue Dec 2 03:36:53 1997
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> Date: Mon, 01 Dec 1997 13:54:30 -0800
> From: Dmitri Kuznetsov <vdm@iname.com>
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> To: alaa alani <alaa@lsil.com>
> Cc: si-list@silab.Eng.Sun.COM
> Subject: Re: [SI-LIST] : Sweeping Temp within MonteCarlo in HSPICE
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> Alaa,
>
> Hspice's Monte-Carlo analysis cannot be applied to the internal
> temperature variable TEMPER. But, you can sweep it in a parameter
> sweep, e.g.
>
> .TRAN 1ns 1us SWEEP TEMPER POI 25 30 35
>
> The temperature data can also be put in a .DATA:
>
> .TRAN 1ns 1us SWEEP DATA=temp_data
> .DATA temp_data TEMPER 25 30 35
>
> If you want to have a single .tr output file, you could pre-generate the
> random parameter values for the Monte-Carlo analysis, and put them all
> in the .DATA along with the TEMPER.
>
> You can also use Monte-Carlo with .TEMP, for instance
>
> .TRAN 1ns 1us SWEEP MONTE=10
> .TEMP 25 30 35
>
> but that will generate a separate .tr file for each temperature.
>
> There is also DTEMP parameter that can be specified in the element card
> for temperature-sensitive devices. This one can be used with
> Monte-Carlo.
>
> Regards,
> -- Dmitri
>
> =======================================================
> Dmitri Kuznetsov, Ph.D.
> R&D Engineer
>
> Avant! Corporation e-mail: vdm@avanticorp.com
> 46871 Bayside Pkwy. Tel: (510)413-8631
> Fremont, CA 94538 Fax: (510)413-7706
> =======================================================
>
>
> alaa alani wrote:
> >
> > Dear Coleagues,
> >
> > (especially for those Hspice gurus!)
> >
> > I have been using Monte Carlo analysis in Hspice to sweep a number of
> > parameters such as package pin inductance, capacitance, etc. But when
> > it comes to temperature, Hspice seems to be treating it differently.
> > The problem I have now is how to sweep the temperature with the rest
> > of parameters using Monte Carlo analysis.
> > I tried to define it as:
> >
> > .param temp1 = aunif(50, 50) temp = 'INT(temp1)'
> >
> > The syntax was acceptable but when I viewed the results, there was no
> > effect of changing temperature. Instead there was another parameter
> > "temper=25C" in the results which was constant and overiding the
> > temperature value determined by MonteCarlo. Here's the .measure file:
> >
> > MonteCarlo Hspice
> > | |
> > V V
> >
> > index tempo@temp1 gb_max q0init q1init vdd_min temper
> > alter#
> > 1.0000 17.0000 0.6976 0.5046 1.5000 1.4756 25.0000
> > 1.0000
> > 2.0000 64.0000 0.6976 0.5046 1.5000 1.4756 25.0000
> > 1.0000
> > 3.0000 86.0000 0.6976 0.5046 1.5000 1.4756 25.0000
> > 1.0000
> >
> > The "tempo" was determined by MonteCarlo while "temper", which I have
> > no control over it, was overriding it.
> >
> > I also tried to define the temperature as a parameter in the .temp
> > statement but it failed complaining: temp cannot be parameterised in
> > .temp statement.
> >
> > I could use .ALTER statement but this will lead to the generation of
> > many .mt and .tr files which I am trying to avoid (i.e. The idea is to
> > include all results in one file then use a spreadsheet to extract a
> > set of equations that relate the result with each and every individual
> > parameter).
> >
> > Your help is much appreciated.
> >
> > Regards,
> >
> > *****************************************************************************
> > Dr. Alaa F. Alani
> > Senior Signal Integrity Eng. Tel: +44
> > (0)1344-413383
> > LSI-Logic Europe Ltd. Fax: +44
> > (0)1344-413186
> > Greenwood House, London Road
> > Bracknell, Berks RG12 2UB E-Mail: alaa@lsil.com
> > England
> >
> > *****************************************************************************
>
>