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The design of a notch filter poses challenges in managing the tradeoff between distortion in the passband and the notch band. The ideal notch filter has a 3-dB notch bandwidth (BW) equal to zero in the notch band and the unity gain in the passband. Therefore, the design objective is to shrink the BW as small as possible while preserving the gain as close to one as possible. The task of a notch filter...
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