GATE EC 2016 Set 2 — Question 25
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Analog Circuits → BJT & MOSFET Amplifiers → Coupling & Bypass Capacitors
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Question
Which one of the following statements is correct about an ac-coupled common-emitter amplifier operating in the mid-band region?
Correct answer
(A) The device parasitic capacitances behave like open circuits, whereas coupling and bypass capacitances behave like short circuits.
Solution
In the mid-band region of an amplifier:
1.Coupling and bypass capacitors are chosen to be large so that their reactance is negligible at mid-band frequencies. Thus, they behave as short circuits.
2.Device parasitic (internal) capacitances are very small, so their reactance is very large at mid-band frequencies. Thus, they behave as open circuits.
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