[SI-LIST] Re: Ground problems

Stephanie,

What is the difference between the 0 ohm resistor and the wire? Have you
found 0 ohm resistors that do not measure to be 0 ohms? I am working on a
design that has a separated analog and digital ground area that needs to be
connected in the same manner as Ramana described and I would like to
understand the issue with the 0 ohm resistor.

Thanks,
John LeVieux
Littlefeet
Poway, CA

-----Original Message-----
From: stephanie.goedecke@xxxxxxxxxxx
[mailto:stephanie.goedecke@xxxxxxxxxxx]
Sent: Wednesday, May 28, 2003 12:23 AM
To: raman@xxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ground problems


Hi Ramana,

I think it might not be a 0 Ohm resistor.  Would you consider replacing it
with
a wire, and repeating the measurement?

regards,
Stephanie


Stephanie Goedecke

Philips - SP3D Chip Design GmbH
Petersbrunnerstr.17
82319 Starnberg / Germany

Phone:  +49-8151-270-160
Fax : +49-8151-270-200



 

 

                                                   To:
<si-list@xxxxxxxxxxxxx>                        
                                                   cc:   (bcc: Stephanie
Goedecke/STN/SC/PHILIPS)       
                                                   Subject:    [SI-LIST]
Ground problems                
 

               "Ramana Rao Rayudu"                 Classification:

               <raman@xxxxxxxxxxxxx>

 

               Sent by:

               si-list-bounce@freelists

               .org

 

               2003-05-27 01:45 PM

               Please respond to raman

 

 





Hello,

We are testing the power supply (VRM 8.5 compatible) for our processor
board.

We have a split ground - the power supply ground and the digital ground
shorted at one single point with a 0 ohm resistor. There is no signals
crossing over and I do not think there are any loops.


The voltage difference between the 2 grounds is very large. The CRO shows
a p-p of 2V when measuring between the 0 ohm resistor.


What could be the reason for this and what could the remedies.


Thanks and Regards

Ramana Rao Rayudu
Real Time Systems Group
Centre For Development Of Advanced Computing
No.1 Old Madras Road, Byappanahalli
Bangalore - 38, India
Ph 91-80-5244059

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