GATE EC 2014 Set 1 — Question 49
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.NAT+2 / -0MediumSmall-Signal & Hybrid-Pi ModelBJT & MOSFET AmplifiersAnalog CircuitsBiasing & DC Operating Point
Analog Circuits → BJT & MOSFET Amplifiers → Biasing & DC Operating Point
Last updated
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
Solution
DC Analysis:
Calculate the base voltage using the voltage divider:Emitter voltage .
Emitter current .
Dynamic emitter resistance .AC Analysis:
The capacitor bypasses the resistor , but the resistor is in series with the emitter and is not bypassed.
The voltage gain for a common-emitter amplifier with emitter degeneration is:Substituting the values ():Thus, the voltage gain is approximately .
Calculate the base voltage using the voltage divider:Emitter voltage .
Emitter current .
Dynamic emitter resistance .AC Analysis:
The capacitor bypasses the resistor , but the resistor is in series with the emitter and is not bypassed.
The voltage gain for a common-emitter amplifier with emitter degeneration is:Substituting the values ():Thus, the voltage gain is approximately .
Continue learning with Success Tracker
A step still unclear? Work through it with support
Use Success Tracker to ask about the reasoning, then try another GATE EC question to check your understanding.
AI-powered practice· Unlimited practice on eligible plans
- PYQs with solutions
- Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
- Practice that adapts
- Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
- AI doubt support
- Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.
Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.
This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.
More questions on BJT & MOSFET Amplifiers
2026 Set 1 Q17The ideal OP-AMP circuit shown in the Figure produces output voltage when the Switch, S,…2026 Set 1 Q18Consider the circuit shown in the Figure with and . Assume…2026 Set 1 Q50A small signal source, is applied to a BJT circuit as…2026 Set 1 Q53A circuit using an ideal OP-AMP is shown in the Figure. Which of the following options gives the…2026 Set 1 Q60An -channel MOSFET is connected as shown in the Figure. Assume ,…