[SI-LIST] Re: Injecting Noise into a ground Plane

Hey Ron,

Ca Va!

You could use a signal generator at some given frequency and plug it into the 
power plane using an smA Connector. Hopefully you have taps into the power and 
ground plane. Do this on an unpowered board. If you monitor the signal traces 
you should see some
coupling. If you take the difference between the two differential signal traces 
(channel 1 - channel 2) (the oscope should be able to give you this function), 
you should then see that the coupled noise that is common to each line cancels 
out. That is
assuming that they are edge-coupled (not broadside). If the stripline traces 
are broadside coupled then you will need to inject noise (that is in phase and 
amplitude) into both the power and ground planes. 

Regards,
Peter

 -- 
Peter LaFlamme

Applied Micro Circuits Corp.
Staff System Applications Engineer
200 Minuteman Rd, 3rd Floor
Andover, MA 01810

978-247-8470 phone
978-623-0055 Fax

Ron.J.Morneault@xxxxxxxxxxxxxxxxx wrote:
> 
> SI Folks,
> 
> Could someone tell me the best approach or technique to inject noise into a
> ground plane?
> I have a PCB with microstrip and stripline differential traces some are not
> coupled and others are.
> Would like to observe (if possible) how effective differential signaling is
> at being immune to injected
> ground plane noise. Thanks in advance.
> 
> Regards...
> Ron Morneault
> 
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> 
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
> 
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> 
> List archives are viewable at:
>                 http://www.freelists.org/archives/si-list
> or at our remote archives:
>                 http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>                 http://www.qsl.net/wb6tpu
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: