[SI-LIST] Re: Hspice Initial conditions for AC cap in serial link
- From: "Beal, Weston" <Weston_Beal@xxxxxxxxxx>
- To: SI-List <si-list@xxxxxxxxxxxxx>
- Date: Mon, 23 Apr 2012 16:05:06 +0000
Joel,
You can reduce the capacitor value even more (maybe 1/1000 nominal) and find
the average capacitor voltage much faster. Notice that the voltage changes
during every transition, so the best you can do is specify a starting voltage
that is the average of the voltage over a few periods after it has mostly
settled.
Regards,
Weston
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Joel Brown
Sent: Monday, April 23, 2012 8:55 AM
To: SI-List
Subject: [SI-LIST] Hspice Initial conditions for AC cap in serial link
Is there a quick way to know what value to use for setting the initial
condition for the voltage across a capacitor in a Hspice simulation of a high
speed serial link such as PCI express?
I assume if I new the bias points of the transmitter and receiver that would
tell me but I am not sure how to find those out.
I did run a very long simulation with the capacitor reduced from .1uF to .01uF
but this takes a long time.
Thanks
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