Switched capacitor filters are very nice to work with, easy to design = and control, but they have limited dynamic range, typically less than 80 dB. = Now that's a lot if you're just looking at an analog trace, but only = equivalent to a 12 or 13 bit A/D converter. If anybody is using a 16-bit or one of = the 24-bit delta-sigma converters, you should use digital filtering to = maintain your dynamic range. =20 Doug Crice Wireless Seismic http://www.wirelessSeismic.com 12996 Somerset Drive phone 1-530-274-4445 Grass Valley, CA 95945 USA fax 1-530-274-4446 =20Switched capacitor filters are very nice to work = with, easy to design and control, but they have limited dynamic range, typically = less than 80 dB. Now that’s a lot if you’re just looking at an analog = trace, but only equivalent to a 12 or 13 bit A/D converter. If anybody is using = a 16-bit or one of the 24-bit delta-sigma converters, you should use = digital filtering to maintain your dynamic range.
Doug Crice
Wireless Seismic = http://www.wirelessSeismic.com
12996 Somerset Drive &nbs= p; phone 1-530-274-4445
Grass Valley, CA 95945 USA fax = 1-530-274-4446