[SI-LIST] Re: the difference of current profile between power supply path, signal path and return path in a circuit loop

  • From: Jory McKinley <jory_mckinley@xxxxxxxxx>
  • To: xuzhengrong@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
  • Date: Thu, 30 Aug 2007 07:47:03 -0700 (PDT)

Zhengrong,
The image or return current will eventually get back to the buffer but may take 
not take a single reference plane to get back.  It all depends on your stack-up 
and how you routed your buffer signal.  Please see some of the same references 
pointed out for split plane. 
-Jory



----- Original Message ----
From: xuzhengrong <xuzhengrong@xxxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Thursday, August 30, 2007 7:34:03 AM
Subject: [SI-LIST] the difference of current profile between power supply path, 
signal path and return path in a circuit loop

Hi all,
After scanning the discussion about the return path,  I  have to think such
a question that, 
what does the  current profile in power supply, signal path and return path
in a circuit loop look like, and what is the difference of the three ones?
As is known to all,  in a simple DC circuit such as small bulb loop,
current supply is equal to the return current between possive pole and
negative pole.
Then, in a high speed digital circuit,  if only one buffer works and outputs
one signal level(excluding multi-signal use the common return path and power
supply path ),  
would current profiles in the signal path and its return path be the same?
Furthermore,  as the source of the signal current,  what is the difference
between  the current profile in the power supply path and its signal current
profile?

Thanks for any idea.

Zhengrong


------------------------------------------------------------------
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:
//www.freelists.org/webpage/si-list

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


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
        //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
  








       
____________________________________________________________________________________
Need a vacation? Get great deals
to amazing places on Yahoo! Travel.
http://travel.yahoo.com/
------------------------------------------------------------------
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:
//www.freelists.org/webpage/si-list

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


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                //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: