Calculating Number of Sections
The curves shown indicate the stopband frequencies normalized to the 3 dB bandwidth for filters with 2 to 13 sections. A ratio of stopband frequency to 3 dB bandwidth is used.
The curve given on the right shows a slightly asymmetric frequency response resulting from the circuit used. Other schematics may be utilized to yield different attenuation characteristics (i.e. steeper on the high frequency side of the passband and shallower on the low side).
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