[SI-LIST] Re: AC Coupled Signals
- From: "Chris Cheng" <Chris.Cheng@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 24 Sep 2007 12:28:40 -0700
There is a theory out there that claim the AC cap pad presents itself as =
a lower impedance and thus can reflect any impedance mismatch =
experienced by the imperfect receiver terminator or the receiving chip =
parasitic capacitance which can be quite off at high speed from the line =
impedance. One can take advantage of both phenomenon by adjusting the =
placement of the AC cap pad and thus can bounce any reflection back to =
the terminator and help (or hurt) the imperfect termination.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Edi Fraiman
Sent: Monday, September 24, 2007 11:39 AM
To: npatel@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: AC Coupled Signals
Hi,
I think that AC cap location is does not matter. You should be more
aware that capacitance body might change the characteristic impedance of
your transmission line. In this case you should adjust transmission line
width.
Actually is best described by Dr. Howard Johnson's "Potholes" =
analogy.=3D20
Edi
---Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of npatel@xxxxxxxxxx
Sent: Monday, September 24, 2007 12:51 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] AC Coupled Signals
Hi all,
In case of AC coupled signals does anyone know of an optimum placement
for the caps? I mean should they be placed near the source, receiver,
middle of the transmission line?
How much difference does it make in the opening of the eye?
The signals are differential CML running at 3.0Gbps
Thanks,
Nikhil=3D20
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