[SI-LIST] Re: Bandwidth
- From: "Ken Cantrell" <Ken.Cantrell@xxxxxxxxxxx>
- To: <p2rich@xxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 19 Sep 2001 08:34:43 -0600
Rich,
I use the 20%-80% value only when confirming the [Ramp] data in the ibis
file. Other than that I use 10%-90%. Under what conditions have you found
the 20%-80% more accurate?
Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Rich Peyton
Sent: Tuesday, September 18, 2001 1:21 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Bandwidth
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Hi all,
I have equations for:
a) bandwidth requirement = .361/Risetime.
b) f3dB =.35/Risetime
Are the above for 10% - 90% risetimes?
In reading "Electronic Packaging of High Speed Circuitry" by Konsowski &
Helland (any comments on book? mine- Good Reading )
it states that you should be using 20% - 80% for high speed signals and
states equation:
c) 3F = 1/trise (20-80%)
If I use a risetime of 1nsec. into the above equations I get:
a) 361 MHz
b) 350 MHz
c) 1GHz
Does anyone want to shed some light on this and comment on which is best to
use when running in high speeds. I was taught awhile back ago to use the
10% - 90%, but am running allot of info that using the 20% - 80% is more
accurate.
Thanks to all who reply,
Rich
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