[SI-LIST] Re: Stripline problem
- From: Rohit MISHRA <rohit.mishra@xxxxxx>
- To: "michang0384@xxxxxxxxx" <michang0384@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 10 Sep 2012 13:58:36 +0800
Hello Xing Chang,
Relax, no one is going to shoot you for your English !!
Si-list is a forum where people exchange technical conversation related to
Signal Integrity and related fields and question you asked is well within
purview of related fields.
Your question is a classical case of stripline where power plane is not the
signaling voltage and now question comes that why it's advised to not use
unrelated power plane ?
Actually when you use unrelated power plane, you force return current to travel
through two different PDN networks ( In your case it is core and IO supply
network !) that means current will see high PDN impedance and as you know high
PDN impedance means high voltage drop across PDN impedance thus achieving a low
voltage drop is difficult in this case.
To cut a long story short, when you use unrelated power plane the decoupling
requirements are much more stringent to achieve target impedance.
Hope that helps !
Rgds,
Rohit Mishra
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Xing Chang
Sent: Monday, September 10, 2012 10:40 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Stripline problem
Hello,
I design pcb and in one board, i design stripline and I put core supply as
one reference and ground as another reference. my boss told me that i
shouldn't use core supply but I should use IO supply as reference. I asked
the reason but I was told that it creates a problem so dont use it. I am
confuse, can someone help me to understand ?
I am afraid, my english is not so good.
Xing Chang
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