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

  • From: xuzhengrong <xuzhengrong@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Thu, 30 Aug 2007 20:34:03 +0800

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


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