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Cascading increases lower cut-off frequencies.(a) True(b) FalseI had been asked this question during an interview.My doubt stems from Cascaded Amplifier topic in portion General and Feedback Amplifiers of Analog Circuits

Answer»

The CORRECT choice is (a) True

For explanation I would say: Considering each amplifier has lower cut-off frequency fL1 then net lower cut-off frequency for a network of N cascaded amplifiers is fL = \(\frac{f_{L1}}{\sqrt{2^{1/N}}-1}\)

For N>=2, \(\sqrt{2^{1/N}}-1\) < 1, thus fL > fL1.


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