### Active Filter Design Techniques

2003-3-25u2002·u2002For that purpose, the transfer function must allow for complex poles and needs to be of the following type: A(s) A0 1 a 1s b1s2 1 a 2s b2s2 1 ans bns2 A0 i 1 a is bis2 where A0 is the passband gain at dc, and ai and bi are the filter coefficients. Since the denominator is a product of quadratic terms, the transfer function represents

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