differential impedance

Weston Beal (beal@galois.eng.hou.compaq.com)
Wed, 9 Apr 97 11:26 CDT

We've seen specifications on differential impedance, but no one has
been able to define what that number represents. We use the rule of
thumb that the differential impedance is 2 times the odd mode
impedance. Does that make sense? Can someone give me a real
definition of differential impedance and it's relation to odd mode
impedance?

Thanks,

-- 
Weston Beal                Signal Integrity Engineer    
beal@twisto.compaq.com     beal@bangate.compaq.com
"A little bit of knowledge is a dangerous thing"