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A second order low pass filter is given an input frequency of 30kHz and produce a output having phase angle of 79o. Determine the pass band gain of the filter?

A second order low pass filter is given an input frequency of 30kHz and produce a output having phase angle of 79o. Determine the pass band gain of the filter? Correct Answer 46.78 dB

Phase angle of the filter, φ = tan-1(f/fH) => fh =f×tan(φ) =30kHz × tan(79)= 154.34kHz. Therefore, the pass band gain AF = fH/0.707 = 154.34kHz/0.707 AF= 218.3 =20log(218.3)= 46.78dB.

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