[SI-LIST] Re: symmetry vs length matching for diff signals
- From: "Cortex Chen" <Cortex.Chen@xxxxxxxxxxxx>
- To: "Rick Brooks" <ricbrook@xxxxxxxxx>
- Date: Wed, 1 Dec 2004 11:31:48 +0800
Dear Rick,
Thanks for your information.
Regards,
Cortex
-----Original Message-----
From: Rick Brooks [mailto:ricbrook@xxxxxxxxx]
Sent: Wednesday, December 01, 2004 7:34 AM
To: Cortex Chen
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [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=20
Design, pg 198.
He defines a magnetic coupling coefficient km and a capacitive coupling=20
coefficient kc
with regard to coupled transmission lines
km =3D Lm/(SQRT(L1*L2))
kc =3D 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=20
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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