GATE EC 2024 Set 1 — Question 18
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.MCQ+1 / -0.33MediumActive Load Diff AmpCurrent Mirrors & Diff AmpsAnalog CircuitsFeedback AmplifiersFeedback & Oscillators
Analog Circuits → Current Mirrors & Diff Amps → Active Load Diff Amp
Last updated
Question
For the closed loop amplifier circuit shown below, the magnitude of open loop low frequency small signal voltage gain is 40. All the transistors are biased in saturation. The current source is ideal. Neglect body effect, channel length modulation and intrinsic device capacitances. The closed loop low frequency small signal voltage gain (rounded off to three decimal places) is ____.
Correct answer
(A) 0.976
Solution
The given circuit is a differential amplifier configured with unity negative feedback.
1.Identify the configuration: The output is connected directly back to the inverting input (the gate of the right-hand NMOS transistor). This is a unity-gain buffer configuration.
2.Apply the feedback formula: For a non-inverting amplifier with open-loop gain and feedback factor , the closed-loop gain is:
3.Substitute given values:
- Open-loop gain magnitude
- Feedback factor (unity feedback)
4.Calculate the numerical value:
5.Round to three decimal places:
Thus, option (A) is correct.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 Current Mirrors & Diff Amps
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 ,…