FreeLists / si-list / [SI-LIST] Re: Getting Hspice to accept numbers with mantissa' s larger than 8 characters

["Taha Amiralli" <thamiral@xxxxxxxxx>]

Hello all,

Thanks for that demo on the double precision nature of parameters. I
actually tired something along those lines yesterday and got similar
results.

I wonder if giving a double precision number/constant to the .param
has the same effect as "adding" two parameters. (unfortunately, I have
a really really large number of components in my algorithm that
require double precision values for this debugging test and this could
get very cumbersome. I may be able to give it a try this afternoon to
see if this works)

With regards to Andy's comments, unfortunately, we get an academic
version of Hspice (being a university) and hence, we also get put at
the bottom of the Synopsys support list. On the bright side, I did put
in a request and when it gets serviced, i'll know for sure whats going
on.

Andy, you are correct about there being an 'exact' solution to a
linear network in hspice, however, as everyone has already guessed,
there are nonlinear components in the work that I am conducting and
hence, the hspice solver is computing a numerical solution using
iterative solvers such as the trapezoid method.

Thanks a lot once again,

Sincerely,

-------------------
Taha Amiralli
thamiral [A] uwo [D] ca
thamiral [A] gmail [D] com

MESc Candidate 2007, Computer Engineering
The University Of Western Ontario

BESc, BSc. 2005,
Computer Engineering & Computer Science
The University Of Western Ontario
---------------------------------------------------------------



On 4/6/06, Buchs, Kevin J. <buchs.kevin@xxxxxxxx> wrote:
>
> Here is a demonstration that shows the double precision nature of
> parameters.   Note, if you want post output, you should not use post=3D2
> (ASCII) because that will not work.  Use binary, post=3D1.  The print out=
put
> works fine.
>
> .option numdgt=3D10 post=3D1 probe post_version=3D2001
> .param rvalue1=3D1.000000001
> va a 0 1.0
> r1 a 0 'rvalue1'
> r2 a 0 1.0
> .param rvaluea2=3D1.0
> .param rvalueb2=3D1E-12
> .param rvalue2=3D'rvaluea2+rvalueb2'
> r3 a 0 'rvalue2'
> .print i1(r1) i1(r2) i1(r3)
> .probe i1(r1) i1(r2) i1(r3)
> .tran 1ps 1ps
> .end
>
> You can use this command on Linux to dump the double floats out of the
> results file and see that they are truly doubles.  A plotting program suc=
h
> as cosmoscope can read this.
>
> > od -j 476 -t fD dbl_precision.tr0
> 0000734   0.000000000000000e+00   9.999999989999999e-01
> 0000754   1.000000000000000e+00   9.999999999989999e-01
> 0000774   9.999999989999999e-01   1.000000000000000e+00
> 0001014   9.999999999989999e-01   1.250000000000000e-13
> 0001034   9.999999989999999e-01   1.000000000000000e+00
> 0001054   9.999999999989999e-01   9.999999989999999e-01
> 0001074   1.000000000000000e+00   9.999999999989999e-01
> 0001114   2.500000000000000e-13   9.999999989999999e-01
> 0001134   1.000000000000000e+00   9.999999999989999e-01
> 0001154   9.999999989999999e-01   1.000000000000000e+00
> 0001174   9.999999999989999e-01   5.000000000000000e-13
> 0001214   9.999999989999999e-01   1.000000000000000e+00
> 0001234   9.999999999989999e-01   9.999999989999999e-01
> 0001254   1.000000000000000e+00   9.999999999989999e-01
> 0001274   7.500000000000000e-13   9.999999989999999e-01
> 0001314   1.000000000000000e+00   9.999999999989999e-01
> 0001334   9.999999989999999e-01   1.000000000000000e+00
> 0001354   9.999999999989999e-01   1.000000000000000e-12
> 0001374   9.999999989999999e-01   1.000000000000000e+00
> 0001414   9.999999999989999e-01   9.999999989999999e-01
> 0001434   1.000000000000000e+00   9.999999999989999e-01
> 0001454   1.000000015047466e+30  1.699585821693888e-321
>
>
> Kevin Buchs   Mayo Clinic  200 1st St. SW  Rochester, MN 55901
> buchs.kevin@xxxxxxxx  507-538-5459 http://www.mayo.edu/sppdg
>


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