[SI-LIST] Re: PCI Express AC Coupling
- From: "Bowden, Ivor" <ibowden@xxxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 11 Mar 2010 14:02:32 -0800
I wonder about having 2 series capacitors in a signal line. Could the floating
node be subject to a static voltage buildup due to no DC path to ground? Enough
to damage the capacitor (ESD event for example)?
-Ivor
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Michael Rose
Sent: Wednesday, March 10, 2010 2:47 PM
To: Chris Johnson; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PCI Express AC Coupling
Chris, I thought PCIe required AC coupling on both ends(?). Generally, I like
to place the coupling caps on the RX end since the channel attenuates the slew
rate making the impedance discontinuity a bit less severe. In some cases, AC
coupling on both ends has the advantage of tolerating a short circuit through
the interconnect without damaging the driver.
Mike
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Chris Johnson
Sent: Wednesday, March 10, 2010 4:37 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] PCI Express AC Coupling
Could someone tell me if any of the TX (from motherboard to card), RX (from
card to motherboard), and REFCLK (from motherboard to card) PCI Express
differential pairs are guaranteed to be AC coupled on the motherboard?
Also, is there significant signal integrity downside to AC coupling on the plug
in card, when the signals are already AC coupled on the motherboard, assuming
that the AC coupling is right at the I/Os to the chip on the plug in card?
Thanks,
Chris
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