FreeLists / si-list / [SI-LIST] Re: Problem with HFSS 9

["Mike Heimlich" <mike@xxxxxxxxxxx>]

 Chand:

So called "fast frequency sweeps" are approximation techniques which use
data from within the underlying computational method to "predict" the
response at other frequencies.  So over the broader bandwidth simulation
it is doing more interpolation for your 200MHz BW of interest.

Also, if by "impedance" you have a significant I2R loss, you may not be
getting accurate results if you do not use enough volume meshing in the
metal.

You may want to try one of the 3D planar methods, like closed-boundary
method of moments (Sonnet or EMSight), which allows you to determine the
upper bound of the error by halving the mesh size....see anyone of the
papers by J. Rautio about this.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of kundanchand chand
Sent: Saturday, October 15, 2005 1:44 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Problem with HFSS 9

Hi everyone

=20

I am trying to get impedance plots for a power bus board using HFSS 9. I
performed simulations on the same geometry using the following 2
frequency ranges:

=20

1) start =3D 1 MHz, stop =3D 200 MHz, step =3D 1 MHz

2) start =3D 1 MHz, stop =3D 1 GHz, step =3D 1 MHz

=20

But the impedance plots (1 MHz - 200 MHz) are different for both cases.=20

=20

Can anyone let me know the reason for that. I am using "fast" frequency
sweep.

=20

Thanks

        =09
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