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What is the pass band gain of a low pass filter with 1- δP as the pass band attenuation?

What is the pass band gain of a low pass filter with 1- δP as the pass band attenuation? Correct Answer 20log(1- δP)

If 1-δP is the pass band attenuation, then the pass band gain is given by the formula 20log(1-δP).

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