GATE EC 2014 Set 1 — Question 49
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Analog Circuits → BJT & MOSFET Amplifiers → Biasing & DC Operating Point
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Question
For the amplifier shown in the figure, the BJT parameters are , , and thermal voltage . The voltage gain () of the amplifier is _______ .
Correct answer
-240 to -230
Solution
DC analysis. Thevenin equivalent of the bias divider:With :(Neglecting the base current gives mA; either way the result below lies in the same range.)Small signal. . The 1 mF capacitor bypasses only, so stays as emitter degeneration:(With the approximation mA, and the gain is .)Answer: about (official accepted range to )
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