[SI-LIST] Re: question about using headers in power distribution ?

Hello Anand,
Well, you can use any method that you like provided you use thick traces and
use multiple vias. You should preferably use a localized plane around the
connector pin and the regulator pad.
Regards,
Ruturaj







-----Original Message-----
From: Anand Kulkarni [mailto:anand287@xxxxxxxxx]
Sent: Wednesday, November 20, 2002 11:46 AM
To: signal integrity free list
Subject: [SI-LIST] question about using headers in power distribution ?



Hi all,

I am building a PCB that mainly has a xilinx virtex 2000 {XCV2000E}
Now this is a dual voltage chip, i.e :
it requires:
1)  1.8 volts for core voltage 
2)  3.3 volts for I/O's

I guess I will need "two" power planes for the "two" voltages respectively ?


I am using a PC ATX power supply for this purpose . This supply 
will connect to a PC ATX connector on my board.
On the board I am generating the 1.8 volt using a voltage regulator.

Now my question is:
Should the power pin of the PC ATX connector connect directly to 
the respective power plane by using a VIA  ? 
--------OR-----------
Is it alright if the trace from this power pin first passes through 
a header part before going to the power plane  ( again using a VIA) ?

please do reply with your comments/suggestions ;I'd really appreciate any
feedback.

thanks a lot

Anand Kulkarni





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