[SI-LIST] : Réf. : [SI-LIST] : Reference plan

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From: luca.giacotto@transport.alstom.com
Date: Wed Feb 07 2001 - 01:22:39 PST


Yitzhak,

the nearest planes are the ones you take as references for your impedance
calculation: the electromagnetic wave guided by your line is bounded by the
firsts planes it founds, and on them (it, in the case of a microstrip) induces
the return current.

You want a good decoupling among reference planes in order to have them AC-short
circuited, which minimize the mismatch (inductance) between a driver referenced
to a certain plane, a line referenced to another plane and/or a charge
referenced to another plane.

Hope this is useful.

Good luck,
Luca

Yitzhak Revach <yitzhak.revach@G-CONNECT.co.il> le 07/02/2001 07:14:31

Veuillez répondre à Yitzhak Revach <yitzhak.revach@G-CONNECT.co.il>

Pour : si-list@silab.eng.sun.com
cc : (ccc : Luca GIACOTTO/TRV/DTR/GECALSTHOM)

Objet : [SI-LIST] : Reference plan


     Hi,

     Calculating line impedance take the distance of the trace from it
reference plan e.g. VCC,VDD, GND as one of the factor influencing the
impedance.

     My questions are:

     1 Which Reference plan it is best to refer VCC,VDD,GND "?". What
are the factors I should take into consideration ?

     2 How to refer to a trace between 2 reference plan e.g. VDD, VCC
(not GND) ?

     3 Is there an educated article on that subject ?

     Thanks.

     Yitzhak Revach
     R&D Engineer
     *********************************************
     G-Connect - Helping ISPs to differentiate www.g-connect.com
     POB 2200, Herzlyia B, 46120, Israel
     <mailto:yitzhak.revach@g-connect.co.il>
     Tel : + 972 9 9591-487
     *********************************************



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