) If a filter has unity gain (i. e. 0 dB) in its passband, you know that the frequency

) If a filter has unity gain (i. e. 0 dB) in its passband, you know that the frequency at which the output has half the amplitude of the input is known as the cutoff frequency. Hence, the gain is -3 dB at the cutoff frequency. However, if the maximum gain in the passband is not 0 dB, the cutoff frequency is the point where the gain is 3 dB lower than the maximum gain. When measuring cutoff frequency from a Bode plot, if you notice that the maximum gain is 8 dB, then what is the gain at the cutoff frequency?

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