Subject: [IBIS-Users] How to determine Ccomp
From: erik.van.der.ven@philips.com
Date: Wed Aug 06 2003 - 02:25:12 PDT
Dear IBIS collegues,
What is the best way to determine Ccomp?
Basically there are two ways: applying a ramp to the output terminal and
calculate Ccomp from the slew-rate, or connecting an inductor to the
output and calculate the Ccomp from the resonace frequency.
Which method gives the best results? > always, or application dependent?
How is this done for differential outputs. Outputs like LVDS have internal
feedback loops to control the common level. Must something be done with
the "other" output? Is the peaking a reliable measure for the value of
Ccomp, or may the added inductor shift the poles and zeros of the feedback
buffer due this load causing a peaking that is not just the parallel
connection of Ccomp and the test inductor?
With kind regards,
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
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