# Re: [SI-LIST] : Simulation question.

From: Jim Freeman ([email protected])
Date: Mon May 07 2001 - 20:44:45 PDT

Hi Whiz,
check out the variation of capacitance with Z0. I think that you will find
that it is an inverse relationship.

Thanks
Jim Freeman

"Moran, Brian P" wrote:

> 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
> [email protected]
>
> -----Original Message-----
> From: whiz kid [mailto:[email protected]]
> Sent: Monday, May 07, 2001 6:52 PM
> To: [email protected]
> 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.
>
> Rahul.
>
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