[SI-LIST] Re: Interconnect Simulations-V2

If I remember correctly, and its been over 20 years since I've seen this,
but a 2 pole Gaussian low pass filter that is critically damped is the basis
for this number.  That is the response that scope designers were trying to
design to.

Tom Dagostino
Teraspeed Consulting Group LLC     Teraspeed Consulting Group LLC
2926 SE Yamhill St.                Device Modeling Division
Portland, OR 97214                 13610 SW Harness Lane
                                   Beaverton, OR 97008
http://www.teraspeed.com           503-430-1065
tom@xxxxxxxxxxxxx


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On
Behalf Of Keskinen, Kai
Sent: Tuesday, May 20, 2003 9:24 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Interconnect Simulations-V2



If you work out the amplitude of the harmonics of an infinitely repeating
trapesoidal waveform with equal rising and falling edges, you find that the
harmonics on a log-log plot fall at 20dB per decade until you reach
1/(pi*Tr) ~ 0.318/Tr . After that knee frequency, they fall at 40dB per
decade. Most of the significant harmonics are present to the knee frequency.
Clayton Paul's book on EMC has both measurements and the derivation for
those who last did a fourier analysis in undergrad. Does anyone know where
the 0.35 number can be derived from?

Cheers,

Kai Keskinen
Signal Integrity Advisor
Solectron Technical Center
21 Richardson Side Road,
Kanata, ON K2K 2C1
<mailto:kaikeskinen@xxxxxxxxxxxxx>
<http://www.solectron.com/>
"This message may contain information proprietary to Solectron so any
unauthorized disclosure, copying or distribution of its contents is strictly
prohibited."
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