RE: [SI-LIST] : Bandwidth/Frequency Response simulations

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From: Lynne Green (lgreen@mail.hyperlynx.com)
Date: Thu Aug 10 2000 - 11:04:53 PDT


Sean-
Take the PADS layout into HyperLynx. Run the HL SPICEWriter
to generate a SPICE subckt for that net. Add your simulation
controls & sources, and simulate in SPICE or any equivalent.
Lynne

Dr. Lynne Green
Product Marketing Engineer
HyperLynx, A Division of PADS Software, Inc.
14715 NE 95th St, Suite 200
Redmond, WA 98052
425-497-5081
FAX 425-881-1008
lgreen@hyperlynx.com
http://www/hyperlynx.com

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Ray Anderson
Sent: Monday, August 07, 2000 11:18 AM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : Bandwidth/Frequency Response simulations

Sean-

Bandwidth/Frequency Response simulations are frequency domain simulations.
Typically done using spice or some other simulator that supports
frequency domain simulation (HP ADS, Touchstone, Compact, Vipec, etc.).
A network analyzer (either scalar or vector) makes these measurements
in the lab.

This sort of simulation can be used to determine the losses of a t-line
over a wide frequency range, the response of narrow band structures
(filters etc.), simulating the impedance profile of a power distribution
plane, and probably a multitude of other applications.

Just about any measurement that you might make in the time domain using
an oscilloscope or TDR has an analogous counterpart in the frequency domain.
Some phenomena are easier to visualize in the time domain while others are
best
observed in the frequency domain. The fft and ifft allows you to transform
between
them if you have measured or simulated data. Be careful though, as the
Fourier
transform can easily lead you astray if it isn't applied properly. The
rounding
on the edges of a fast rise-time signal that you might observe on a scope
are the result of the higher frequency components being attenuated. A
transmission
line that causes such rounding of the edges would show more losses at high
frequencies when a frequency domain simulation or measurement is made.

As far as using Pads data as input to a freq. domain simulator, I'm not
aware
of any, but then again I never had the need to look for one either.

-Ray

>
> Anyone know what this is and how and what you use to do this sort of
> simulation? I have asked hyperlynx and did not have any luck. Are there
> companies that can take Pads data and simulate your designs for you?
>
> Regards,
> Sean Murray
> General Manager
>
> M&M Specialties Inc.

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