Post subject: data filter
Unread postPosted: Mon Mar 28,
2005 3:09 pm
I'm looking for an active filter for my 10kbps
TTL data line.
Any ideas what the lowest possible Fc can be for
the filter? Any suggestions for MFG's of such filters?
Post subject: Data Filter
Unread postPosted: Tue Mar 29, 2005 1:47 pm
to your question probably comes from several other questions:
Why do you want a filter at all?
2. Where is the data going?
How much stop-band attenuation do you really need?
4. How much are
you willing to pay for the very narrowest possible bandwidth?
The (unattainable!) limit would be 5 kHz. Any reasonably narrow
filter will either require a phase equalizer to remove inter-symbol
interference, or be many stages of (approximately) linear phase filtering,
such as Bessel filters.
Most filters are either custom-made (read
$$$) or do-it-yourself with building blocks from an IC company such
as Linear Technology (www.linear.com). LTC offers free design software
for their chips.