GATE EE 2014 Set 1 — Question 33
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Analog & Digital Electronics → Amplifiers & Feedback → Single-Stage Amplifiers
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Question
The magnitude of the mid-band voltage gain of the circuit shown in figure is (assuming of the transistor to be 100)
Correct answer
(D) 100
Solution
The circuit is a common-emitter amplifier with the emitter resistor bypassed. At mid-band all coupling and bypass capacitors are short circuits, so the emitter resistor is shorted out.Small-signal gain. The base is driven from through and the output is taken across :Value. No bias data are given, so cannot be computed; it is neglected in comparison with the series resistor:Any realistic of a few kilo-ohms only lowers this somewhat, and of the listed values 100 is the one consistent with this gain.Answer: (D) 100
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