DC return current will flow via Vdd only, but the AC component will flow
through both planes which presumably are tied together by ample decoupling
caps. For signal integrity purposes both planes are important.
Orin Laney
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Paul Huang
Sent: Monday, October 31, 2016 5:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Transmission line terminated to Vdd only
Hello Si-list,
I have a question: I have a CMOS driver that drives a strip-line trace
referenced at top to Vdd supply power plane and at bottom to vss ground plane.
The trace is terminated to vdd only. Since there is no termination to ground,
will it be any return current flowing through the ground plane or only through
the Vdd power plane?
Thanks,
Paul
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