[SI-LIST] Re: symmetry vs length matching for diff signals

I'm not sure this is what you are looking for or not...

There is a description in Ron Poon's book: Computer Circuits Electrical 
Design, pg 198.
He defines a magnetic coupling coefficient km and a capacitive coupling 
coefficient kc
with regard to coupled transmission lines

km = Lm/(SQRT(L1*L2))
kc = Cm/(SQRT(C1*C2))

Lm and Cm are mutual inductance and mutual capacitance per unit length
L1 and L2 are self inductance and capacitance per unit length.

As a rough guideline: if km and kc are less than 0.2, the lines are said to 
have "loose" coupling.


I hope it helps,
- Rick






At 07:30 PM 11/30/2004 +0800, Cortex Chen wrote:
>Dear Abe Riazi,
>How to determine the tightly and loosely coupled pairs?
>
>Regards,
>
>Cortex
>
>
>
>
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