From: [email protected]
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 <[email protected]> le 07/02/2001 07:14:31
Veuillez répondre à Yitzhak Revach <[email protected]>
Pour : [email protected]
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:[email protected]>
Tel : + 972 9 9591-487
*********************************************
**** To unsubscribe from si-list or si-list-digest: send e-mail to
[email protected]. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****
This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:30:49 PDT