RE: Problem with clocked driver

Hi Andy,

Thanks for your clarification. Just to be clear with your suggestion: are
you saying that I should connect at the output a transient source with a
rather slow ramp that changes the voltage (over time) in the range required
by IBIS (e.g. -Vdd to 2Vdd for pulldown) and measure output voltage and
current at several time points? The other question: when should I start
taking the data?

Please clarify further.

Thanks.

Hassan.

-----Original Message-----
From: Ingraham, Andrew [mailto:Andrew.Ingraham@compaq.com]
Sent: Friday, September 01, 2000 11:54 AM
To: ibis
Subject: RE: Problem with clocked driver

>So, to get a pulldown IV curve, I would set the input low, wiggle the
>clock and then sweep the IV curve. To get a pullup IV curve, I would
>set the input high, wiggle the clock and then sweep the IV curve.

I believe this means you would need to do the "sweep" as a .TRANsient
simulation, not the normal .DC sweep. Program the voltage source on the
output to do a rather slow ramp over the sweep range. Keep the ramp rate
down in the volts/microsecond range. If the simulation takes too long,
experiment with faster rates and compare results.

Andy

 
Received on Fri Sep 1 09:21:49 2000