PSN-L Email List Message

Subject: Switched Capacitor filters
From: "Doug Crice" dcrice@............
Date: Sun, 27 Feb 2005 05:58:51 -0800


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

=20















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.

 

Doug Crice

Wireless Seismic           = http://www.wirelessSeismic.com

12996 Somerset Drive       &nbs= p;        phone 1-530-274-4445

Grass ValleyCA  95945  USA    fax = 1-530-274-4446

 


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