[SI-LIST] Re: ISI
- From: "Douglas Burns" <dburns@xxxxxxxxxx>
- To: <ikhan@xxxxxxxxxxxxxxxxxxx>
- Date: Sun, 11 Aug 2002 13:51:36 -0400 (EDT)
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
>
> ------------------------------------------------------------------ To
> unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
