[SI-LIST] Re: 90 degree bend -links
- From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>
- To: <jackmurphy@xxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 1 Sep 2004 11:25:27 -0700
A step generates broad band "noise". The 3 dB point of that noise is
related to the risetime of the step, the faster the step the wider the
bandwidth. BW = 0.35/risetime is a good approximation of the bandwidth of
the energy. The step is what determines the current peak demand, how the
aggressor will couple into victims and at what length traces become
transmission lines.
The clock frequency sets up the series of harmonics that form the square
wave used as the clock. Any time you have a regular waveform you will see
the fundamental and its Fourier series as peaks in the radiated emissions.
The risetime will let you know how far out in frequency there are
significant harmonic.
Tom Dagostino
Teraspeed Consulting Group LLC
503-430-1065
tom@xxxxxxxxxxxxx
www.teraspeed.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Murphy Jack-MGI2488
Sent: Wednesday, September 01, 2004 8:06 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 90 degree bend -links
If noise generated on a plane or trace is a function of pulse rise time and
not the signal frequency then why do the EMC test labs ask for clock
frequencies before testing? EMI testers usually try to trace narrow band
radiated emissions to harmonics of a clock.
Thanks in advance,
Jack
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Senthil Velmurugan
Sent: Tuesday, August 31, 2004 9:30 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] 90 degree bend -links
Some articles link
http://www.omnigraph.com/subpages/articles2/frame.html?article=3Dcorner.h=
t
ml =20
http://www.ultracad.com/90deg.pdf
http://www.ultracad.com/flying.htm
Thanks
Senthil
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