GATE EC 2014 Set 4 — Question 21
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Analog Circuits → BJT & MOSFET Amplifiers → CE, CB & CC Configurations
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Question
If the emitter resistance in a common-emitter voltage amplifier is not bypassed, it will
Correct answer
(B) reduce the voltage gain and increase the input impedance
Solution
When an emitter resistance () is included in a common-emitter amplifier and is not bypassed by a capacitor, it introduces negative feedback. Negative feedback has the following effects on amplifier characteristics:
1.Voltage Gain: Negative feedback reduces the overall voltage gain of the amplifier.
2.Input Impedance: Negative feedback increases the input impedance of the amplifier.
3.Output Impedance: Negative feedback generally reduces the output impedance (though this question doesn't ask about it).
Therefore, if the emitter resistance is not bypassed, it will reduce the voltage gain and increase the input impedance.Continue learning with Success Tracker
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