[SI-LIST] Re: ISI
- From: "Ibrahim Khan" <ikhan@xxxxxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sun, 11 Aug 2002 20:31:12 -0500
Doug,
Thanks for the simple and easy to understand reply. Have you seen any
articles etc. on the subject to dig deeper.
Regards
Ibrahim
-----Original Message-----
From: Douglas Burns [mailto:dburns@xxxxxxxxxx]=20
Sent: Sunday, August 11, 2002 12:52 PM
To: Ibrahim Khan
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] ISI
Ibrahim,
If you think of each bit of data as a "Symbol",then inter-Symbol
Interference (ISI) is the effect preceeding symbols have on the current
symbol.
ISI is caused when a symbol is driven before the network has settled
from a previous symbol. This means that the new symbol is being driven
from a different operating point than other symbols. ISI can be
predicted by deteriming the settling time of the network in question. A
simple simulation of a single edge driving your network will give you
the network settling time (or you could estimate just by looking at the
total network length.
To avoid ISI,You must operate your network such that you never drive
faster than the network settling time. In general,this is impractical
and you need to setup your simulation environment to identify the
affects ISI will have on your circuit.
Doug
Douglas Burns
Signal Integrity Software, Inc.
6 Clock Tower Place
Maynard,MA 01752
www.sisoft.com
> SI Gurus,
>
> Can you please explain in simple term what is:
>
> 1. Inter-Symbol-Interference
> 2. How to predict (based on the data sheet etc) that we will encounter
> ISI 3. How to avoid it
>
> Any literature out there that will explain it.
>
> regards
> Ibrahim Khan
>
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