Thank you Patolfo and Orin,
If I don't have a capacitor between Vdd and ground at the termination resistor
does it mean that my trace referenced to ground operates in unterminated mode
and the same trace referenced to vdd plane operates in matched impedance
terminated mode?
Then if I add a capacitor does it mean that I create an AC termination for
trace referenced to ground too? Does this mean that I lower the overall
termination and I may have reflections?
Thanks,
Paul
Sent: Tuesday, November 01, 2016 at 2:22 AM------------------------------------------------------------------
From: "Patolfo Nery Velya" <patolfo@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Transmission line terminated to Vdd only
The current will flow through the parasitics too, so ac will be couple
partly to ground plane,
al cabo de la vida quisiera descansar
en un bosque de paz y sin preguntas
y desde la espesura escuchar en sosiego
el preludio de un réquiem privadÃsimo
Benedetti **Cansancio
On Mon, Oct 31, 2016 at 6:26 PM, Paul Huang <paul.huang7531@xxxxxxxx> wrote:
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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