Question

What is the value of pass band ripple in dB?

(a) -20log(1- δP)

(b) -20log(δP)

(c) 20log(1- δP)

(d) None of the mentioned

This question was addressed to me by my college director while I was bunking the class.

This interesting question is from Specifications and Classification of Analog Filters topic in section Digital Filters Design of Digital Signal Processing

Answer 1

Correct option is (a) -20log(1- δP)

To explain I would say: 1-δP is known as the pass band ripple or the pass band attenuation, and its value in dB is given as -20log(1-δP).