FreeLists / si-list / [SI-LIST] Return Path

[Darshan Mehta <darshanmehta2k@xxxxxxxxx>]

Hello Experts,

 

I have a question on return current. I was going through the book "Signal 
Integrity Simplified" and came to know that return current path can be a Power 
Plane or Ground Plane. I am still confused about return path. Let me describe 
what I understood. 

 

The Signal Path is the active path and the Electric field from Signal will 
terminate in the return path. The Magnetic field will form a circular loop 
around the signal and it will be coupled with return path so that equal and 
opposite current will flow in return path. Normally if we have Power Plane or 
Ground place, the return path will be easy to find out. Let?s assume, if we 
have a 2 layer board with no copper shape drawn on it, how to find the return 
path for the signal? Please help me understanding this.

 

Thanks,

Darshan Mehta


 
 
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