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Two non-inverting amplifiers, with gain =1 and gain=20 are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain=20 has ___________

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Two non-inverting amplifiers, with gain =1 and gain=20 are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain=20 has ___________

(a) More input impedance

(b) Less negative feedback

(c) Less Bandwidth

(d) Less input impedance

The question was asked by my school teacher while I was bunking the class.

The origin of the question is Properties of Negative Feedback topic in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Right answer is (c) Less Bandwidth

Explanation: Gain bandwidth product remains constant for any device. So a device with larger gain will have a narrow bandwidth and vice versa. Gain decreases for the high frequency is because of the same phenomenon.

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