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Cascading two amplifiers will result in
1. reduction in overall gain and increase in overall bandwidth
2. reduction in overall gain and reduction in overall bandwidth
3. increase in overall gain and increase in overall bandwidth
4. increase in overall gain and reduction in overall bandwidth

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Correct Answer - Option 4 : increase in overall gain and reduction in overall bandwidth

Effect of cascading on the cutoff frequency and Bandwidth:

If n-Identical non-interacting amplifiers are cascaded and each amplifier has an individual cutoff frequency fL1 and fH1 then the overall cutoff freq. of the cascaded amplifier will be:

\({f_L} = \frac{{{f_{{L_1}}}}}{{\sqrt {{2^{1/N}} - 1} }}\)        

\({f_H^*} = {f_{{H}}} \times \sqrt {{2^{1/N}} - 1} \)

For,

 \(\sqrt {{2^{1/N}} - 1} < 1\) 

\({f_L} > {f_{{L_1}}}\;\;\& \;\;{f_H} < {f_{{H_1}}}\)

Note: Cascading Increases lower cutoff and decreases higher cutoff frequency hence bandwidth decreases.

In cascading connection voltage gain increases which in turn reduces the bandwidth to maintain a constant gain-bandwidth product. 

The same analysis is valid for cascading n = 2 amplifiers. 

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