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A active multi-order filter has a cutoff frequency at -3dB.
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-3 dB (half power) cutoff frequency criterion is used for filters with non-ripple passband. For equi-ripple Chebyshev and elliptical (Cauer) filters, the ripple related criterion described by LvW is used by most authors, see graph below. Some books are however calculating a -3 dB cutoff frequency for these filters.
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