RE: [SI-LIST] : Simulation question.

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From: Moran, Brian P (brian.p.moran@intel.com)
Date: Mon May 07 2001 - 19:26:10 PDT


Rahul; aka Whiz Kid

        When dealing with transmission lines your dealing with
characteristic impedance, not resistance. I assume you are confusing the
two. When you use a higher characteristic impedance, you generally have a
lower Er (dielectric constant) and therefore a higher trace propagation
velocity. For this reason higher impedance traces tend to propagate the
signal faster. Check out impednace and propagation velocity in the Motorola
ECL Handbook or some other reference book for the equations and
relationships.

Brian P. Moran
Signal Integrity Engineer
Intel Corporation
brian.p.moran@intel.com

-----Original Message-----
From: whiz kid [mailto:we_r_frendz@yahoo.com]
Sent: Monday, May 07, 2001 6:52 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Simulation question.

Hello SI Gurus,
I have a dumb question regarding the resistance of a
tranmission line.I was simulating for the min and the
max flight times. when I simulate for the min flight
time I use the fast driver, reciever, fast
transmission line. For the fast tranmission line I was
thinking that when you have low resistance the line is
fast and vice versa. But when I used a transmission
line with high resitance I was able to get the min
flight time. why is that so.

Thanks in Advance.
Rahul.

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