Question

The lower and upper cutoff frequencies of an amplifier are unknown. If originally, individual BW of such an amplifier is B1, and now the bandwidth of the cascaded network of 10 such amplifiers is B2, find B2/B1.

(a) 0.26

(b) 3.84

(c) Insufficient data

(d) 5

I got this question in unit test.

The above asked question is from Cascaded Amplifier topic in division General and Feedback Amplifiers of Analog Circuits

Answer 1

Right choice is (a) 0.26

Best explanation: To calculate net bandwidth B2 = B1 x \(\sqrt{2^{1/N}}-1\)

B2/B1 = \(\sqrt{2^{1/N}}-1\)

B2/B1 = 0.26.