[SI-LIST] Re: Differential vs. SE, Propagation speed comparison
- From: steve weir <weirsi@xxxxxxxxxx>
- To: chris.mcgrath@xxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 07 Apr 2005 22:01:22 -0700
Chris, for surface microstrip this can be true since the signals are
complementary, more of the field remains in the air between the two traces
than does for an isolated single-ended line of equal
impedance. Consequently, the average Er is lower and the propagation
velocity is higher. Dr. Bogatin ( www.bethesignal.com ) has a nice
write-up on this phenomenon in his book "Signal Integrity Simplified" He
also has a class coming up in May in the Bay Area.
Steve
At 03:53 PM 4/7/2005 -0400, Chris McGrath wrote:
>I just read in an app note that "differential signals have a faster
>propagation time than single ended signals".
>
>I have played around with some simple simulations and can produce some
>scenarios where this seems to be true, but I'm having a problem
>understanding the physics of why this should be. Can anybody shed some
>light on this?
>
>Thanks,
>Chris
>
>
>------------------------------------------
>Chris McGrath
>Sr. Hardware Engineer
>ADIC
>ph: (607) 241-4858
>eM: chris.mcgrath@xxxxxxxx
>------------------------------------------
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