[SI-LIST] return current on ground plane of a 2-layer PCB
- From: jay chow <ehjc543@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 5 May 2004 15:19:47 -0700 (PDT)
Hi :
I have a question that may be not part of the
typical
SI issue and all comments are welcomed.
Stackup :
Top -layer signal routing.
Dielectric 60mil
Bottom -layer ground plane with some limited
routing
Does the ground plane on the bottom layer of a
2-layer
board still provide good return path ? Or should I
just use the bottom layer for routing and try to
pour copper on both top and bottom to provide
return path instead.
Assuming that traces are spacing 6-mil apart on the
top layer and the dielectric thickness is 62-mil
between the 2 layers.
I imagine most of signals would seek the closest
metal for return path and would not see the ground
plane that is relatively far away (6mil vs 60mil).
The particular design involves 166Mhz SDR memory
and lots of mixed-signal analog function.
Thanks for your help.
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