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Old 25th June 2006, 03:22 PM   #1
T edward is offline T edward  United States
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How would I go about designing an eliptical ox? Tom Daugherty
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Old 27th June 2006, 05:00 AM   #2
theChris is offline theChris
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Location: SIUE, Illinois, USA
for a simple example, i suggest downloading nuhertz 's "filter free" or such. this will give you an example of a 2nd order elliptic stage.

the main key of the so called "elliptic" filters is the addition of a "stopband zero" to the system function.

the downside is that this adds two zeros to the system function, and thus the final slope will be -0db/oct for a 2nd order block. a third pole can be added to give a slope of maybe -30dB/oct in the region of interest, then a slope of -6dB/oct in the stopband.

its really similar to a bandstop filter, except the stopband is attenuated by a constant.

and of course you can add a 2nd order filter as well.

note that the hourglass design seems similar to some patented designs... you might try basing a design on an hourglass design with a stopband attenuation of -40dB and a cutoff attenuation of -6dB. then maybe add a 1st order network at a higher frequency around 5-10x Fc (for lowpass).
if only it could be used for good, not evil...
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Old 27th June 2006, 08:27 AM   #3
forr is offline forr  France
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An active solution I built and I liked :

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