GATE EC 2017 Set 1 — Question 14
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Analog Circuits → BJT & MOSFET Amplifiers → Low & High Frequency Response
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Question
The Miller effect in the context of a Common Emitter amplifier explains
Correct answer
(D) a decrease in the high-frequency cutoff frequency
Solution
The Miller effect describes the increase in the equivalent input capacitance of an inverting voltage amplifier due to the amplification of the capacitance between the input and output terminals. In a Common Emitter amplifier, the Miller capacitance appears in parallel with the input. This significantly increases the total input capacitance, which creates a dominant pole at a lower frequency, thereby reducing the high-frequency bandwidth (decreasing the high-frequency cutoff frequency ).
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