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** Elliptic filter or Cauer filter – add a notch ( or " zero ") just outside the passband, to give a much greater slope in this region than the combination of order and damping factor without the notch.
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** In the case of narrow-band bandpass filters, the Q determines the-3dB bandwidth but also the degree of rejection of frequencies far removed from the center frequency ; if these two requirements are in conflict then a staggered-tuning bandpass filter may be needed.
** For high-pass and low-pass ( as well as band-pass filters far from the center frequency ), the required rejection may determine the slope of attenuation needed, and thus the " order " of the filter.
** Chebyshev filter – slight peaking / ripple in the passband before the corner ; Q > 0. 7071 for 2nd-order filters
** Butterworth filter – flattest amplitude response ; Q = 0. 7071 for 2nd-order filters
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