[SI-LIST] More lossy t-line questions - attenuation per unit length and ln functions

List,
 
The edge rate of a device output is different at it's outputs than at the 
tester inputs.  To know the correction factor I measure DUT outputs vs. tester 
inputs and plot a curve using MSExcel.  A formula is derived from the 
difference in the curves.  No biggie...
 
The problem is that I don't know the "why's" of it all.  Why do I have to use 
Excel?  Why can't I use my pencil instead?
 
Instead of basing my conversion formula on measured data, how can I plug in 
known impedance (or other transmission line parasitics L/C et al), known 
output-edge-rate, and calculate an attenuation factor per unit length?  Then I 
could plug in the t-line length and know what the signal would look like coming 
out the other end before I go fab everything up.
 
Make sense?
 
I've been knocking my head against the "attenuation per unit length" for a 
while now.  Please help a "calculus-ly challenged" individual.....
 
Thanks much.

Shane San Miguel 
Product Engineer 
Platform Memory Operations 
Intel Corporation 
916-356-3211

 

 

 

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: