STUDY MATERIAL · GATE EC · EE · IN
GATE Analog Electronics previous year questions and notes
Every Analog Electronics question from 21 GATE papers (2018–2026), solved step by step and checked against the organising institute’s official answer key — with notes for each topic, a formula sheet and practice questions.
- previous-year questions
- 113previous-year questions
- worked solutions, checked against the key
- 112worked solutions, checked against the key
- GATE papers, 2018–2026
- 21GATE papers, 2018–2026
- topics with notes
- 7topics with notes
TOPICS
Seven topics, in the order they are taught
Cut from the official GATE 2027 syllabus. Each topic has notes, the formulas you need, every previous-year question on it with a checked solution, and practice questions.
- TOPIC 01
Diode circuits: clipping, clamping, rectifiers and regulators
Diode circuits use the diode's one-way conduction to shape waveforms and supply power: clippers limit a waveform, clampers shift it, rectifiers and filters turn ac into dc, multipliers raise the dc level, and Zener regulators hold it steady.
25 previous-year questions · 39 marks · 7 practice
- TOPIC 02
BJT and MOSFET biasing and DC analysis
Biasing sets a transistor's quiescent operating point (Q-point): the DC currents and voltages the signal swings about, and on which every small-signal parameter ($g_m$, $r_\pi$, $r_o$) depends.
13 previous-year questions · 20 marks · 6 practice
- TOPIC 03
Small-signal amplifiers, frequency response, current mirrors and differential amplifiers
Small-signal analysis replaces each transistor by a linear model around its DC operating point: $g_m$, $r_\pi$ and $r_o$ for a BJT, $g_m$ and $r_o$ for a MOSFET.
20 previous-year questions · 31 marks · 5 practice
- TOPIC 04
Feedback amplifiers and oscillators
Feedback amplifiers and oscillators are one loop read two ways.
4 previous-year questions · 5 marks · 6 practice
- TOPIC 05
Op-amp circuits: characteristics, applications and compensation
Op-amp circuits use negative feedback to turn a very high-gain differential amplifier into amplifiers, summers, integrators, converters, precision rectifiers and log amplifiers.
36 previous-year questions · 58 marks · 6 practice
- TOPIC 06
Active filters, comparators, Schmitt triggers, timers, VCOs and PLLs
This topic covers the op-amp circuits that shape a signal's spectrum or turn it into switching and timing signals: first- and second-order active filters (Sallen-Key, Butterworth, band-pass, notch and all-pass), comparators and Schmitt triggers, op-amp and 555 multivibrators, square/triangle generators, VCOs and the phase-locked loop.
13 previous-year questions · 23 marks · 5 practice
- TOPIC 07IN SYLLABUS ONLY
Noise, interference, shielding and grounding
Every measurement system has a floor set by random noise generated inside its own components (thermal, shot and flicker noise) and by interference coupled in from outside through conductive, capacitive and inductive paths.
2 previous-year questions · 4 marks · 6 practice
WHERE THE QUESTIONS FALL
113 questions, by topic and year
Counts across the EC, EE and IN papers of each year. A count of what was asked, not a forecast of what will be. The topic tags are IAE’s reading of each question, and every question links back to its paper.
| Topic | 2018 | 2020 | 2022 | 2023 | 2024 | 2025 | 2026 | Total |
|---|---|---|---|---|---|---|---|---|
| Diode circuits | 3 | 5 | 4 | 3 | 5 | 2 | 3 | 25 |
| Biasing | 3 | · | 1 | 1 | 2 | 3 | 3 | 13 |
| Amplifiers | 1 | 3 | 4 | 3 | 2 | 5 | 2 | 20 |
| Feedback & oscillators | 1 | · | · | 1 | 2 | · | · | 4 |
| Op-amps | 5 | 7 | 4 | 6 | 4 | 5 | 5 | 36 |
| Filters & waveforms | 1 | 2 | 4 | · | 3 | 1 | 2 | 13 |
| Noise & shielding (IN) | 1 | · | · | · | 1 | · | · | 2 |
GATE ECE question papers with solutions: 2026, 2025, 2024, 2023, 2022, 2020, 2018
GATE EE question papers with solutions: 2026, 2025, 2024, 2023, 2022, 2020, 2018
GATE IN question papers with solutions: 2026, 2025, 2024, 2023, 2022, 2020, 2018
The 2019 and 2021 papers are not yet included: the copies we host are image scans that do not carry the official key, so no solution to them could be checked.
How we check solutions: editorial standards.
Analog Electronics formulas by topic
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THE OFFICIAL SYLLABUS
What each paper lists under Analog Electronics
Verbatim from the GATE 2027 syllabus PDFs. EC gives analog circuits a section of its own (Section 4, “Analog Circuits”) and so does IN (Section 6, “Analog Electronics”); EE prints it as the first part of Section 9, “Analog and Digital Electronics”. Only IN lists noise and interference in electronic circuits, shielding and grounding — EC’s only mentions of noise and interference are white noise and inter-symbol interference, under Communications — which is why that topic is marked IN only.
GATE EC
Diode Circuits: Clipping, clamping and rectifiers. BJT and MOSFET Amplifiers: Biasing, AC coupling, small signal analysis, frequency response. Current mirrors and differential amplifiers. Op-amp Circuits: Amplifiers, summers, differentiators, integrators, active filters, Schmitt trigger and oscillators, dominant-pole (Miller) compensation, phase margin.
GATE EE
Simple diode circuits: clipping, clamping, rectifiers; Amplifiers: biasing, equivalent circuit and frequency response; oscillators and feedback amplifiers; operational amplifiers: characteristics and applications; single stage active filters, Active Filters: Sallen Key, Butterworth, VCOs and timers … Schmitt triggers
GATE IN
Types of diode and their applications; BJT and MOSFET circuits, biasing, power dissipation, DC analysis, small signal analysis, frequency response of transistor circuits, feedback, amplifier design. Characteristics of ideal and practical operational amplifiers; applications of opamps: adder, subtractor, integrator, differentiator, difference amplifier, instrumentation amplifier, precision rectifier, active filters, comparators, Schmitt trigger, multivibrators, oscillators, signal generators, voltage-controlled oscillators and phase-locked loop. Sources and effects of noise and interference in electronic circuits; conductively, capacitively, inductively coupled interference; noise generated by electronic components, thermal noise, shot noise, flicker noise; shielding and grounding. Basic principles of component selection based on specifications, circuit board realization and testing.
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