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The value of α in the attenuation band of constant k-low pass filter is?(a) α=2 cosh^-1⁡(fc/f)(b) α=cosh^-1⁡(f/fc)(c) α=2 cosh^-1⁡(f/fc)(d) α=cosh^-1⁡(fc/f)This question was addressed to me in final exam.This interesting question is from Constant-K Low Pass Filter in division Filters and Attenuators of Network Theory

Answer»

Right CHOICE is (C) α=2 cosh^-1⁡(f/fc)

EASY EXPLANATION: α = 2 cosh^-1[Z1/4Z2] and Z1/4Z2 =f/fc. On substituting we get α = 2 cosh^-1⁡(f/fc).



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