[Does injecting current change the indutanc and resistance values ?]

["you se-ho" <sxy28@xxxxxxxxxxx>]

To Dear Dr. Meeker and everyone:

How are you? I played with usual two-traces and ground system. My thought 
was since transmission line parameters (R,L and C etc) depends only on 
transmission line's material and dimension, R and L should be same 
regardless of how I inject currents. However, the nature always makes me 
surprise. I did not get same result. What I did was I divided the conductor 
into 3 pieces. In other words, 100 micrometer conductor into 30-40-30 
micrometers with same conductivity, only give current (excitation) to the 
middle part. In one hand, I still believe what I thought above, in other 
hand, I believe what I saw considering diffusion equation that FEMM solves 
does not dictate how to inject current into system. Then most reasonable way 
to inject is to inject current uniformly throughout the conductor. I start 
to play with this because multiconductor system simulation (and corsstalk 
evaluation) will be difficult if the different injection of current gives 
different results.

Any comments will be appreciated.
Sincerely,
SE-HO YOU

(ps) When I put the +1A for two traces and -1A for ground, the total current 
in the traces are not +1A (becoming less than +1A) as frequency increases 
with the set-up above. When I inject the current +1A throughout the traces 
and -1A for for ground by circuit property (without splitting conductor 3 
pieces), it always turns out +1A and -1A regardless of freqeuncy.





_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp