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 a bypassed emitter resistor. In the mid-band frequency range, the coupling and bypass capacitors are treated as short circuits.
From the circuit diagram:
Assuming , the magnitude of the gain is:Therefore, the magnitude of the mid-band voltage gain is 100.
1.Small-Signal Analysis:
The voltage gain is given by:where:- is the source resistance in series with the base.
- is the collector resistance.
- is the input impedance of the transistor.
From the circuit diagram:
Assuming , the magnitude of the gain is:Therefore, the magnitude of the mid-band voltage gain is 100.
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