Subject: Re: [IBIS] Parameterization in BIRD 75
From: Kim Helliwell (kimgh@apple.com)
Date: Mon Sep 09 2002 - 14:58:13 PDT
Berkeley SPICE does not support this sort of parameterization.
Unfortunately.
Kim
On Monday, September 9, 2002, at 02:38 PM, Muranyi, Arpad wrote:
> To All,
>
> Bob and I were talking about some of the details on the
> parameterization issue for BIRD 75. The question came up
> whether Berkeley SPICE 3F5 can have parameterized element
> values.
>
> Since neither one of us is very familiar with the language
> we wanted to pose this question to this list in hope that
> an expert could tell us whether Berkeley SPICE can do this
> or not.
>
> HSPICE (and others) can use a text string as the value
> of elements, for example
>
> R1 n1 n2 R=resistance or
> R1 n1 n2 resistance
>
> where the value of "resistance" is defined in a .param
> statement:
>
> .param resistance=5
>
> or on the subcircuit definition line:
>
> .subckt n1 n2 ... sub_ckt_name resistance=5
>
> Looking at the Berkeley SPICE manual we could not find
> any mention of ".param", nor did we see any examples
> for the above in the subcircuit description. To make
> things worse, we didn't see any element examples which
> used variable names, only hard coded numeric values.
> This is also true for the controlled sources, even for
> the "non linear dependent" source (B-element), which
> has a nice set of functions, but neither one of the
> examples use variable names, only node names for node
> voltages or source names for branch currents. ("pi"
> does show up in one example, but we couldn't figure out
> whether this was a built-in reserved variable for 3.14....
> or a user defined parameter).
>
> We would like to get anyone's expert opinion on whether
> Berkeley SPICE can have any parameters.
>
> As reference, this is the location of the manual we were
> studying:
>
> http://bwrc.eecs.berkeley.edu/Classes/IcBook/SPICE/UserGuide/
> elements_fr.htm
> l
>
> Thanks in advance.
>
> Arpad Muranyi
> Intel
>
> and
>
> Bob Ross
> Mentor
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