UGC NET Electronic Science Syllabus 2025-26 — Complete Unit-wise Guide
📡 UGC NET Electronic Science (Subject Code: 27) — Paper II covers analogue and digital electronics, semiconductor devices, microprocessors, signals, communication systems, and instrumentation. 100 MCQs | 200 marks | No negative marking.
Electronic Science is one of the core technical subjects under UGC NET, ideal for candidates who have studied Electronics Engineering, Applied Electronics, or Instrumentation at the graduate/postgraduate level. This article provides a comprehensive, unit-wise breakdown of the 2025–26 syllabus as per the latest NTA guidelines.
Exam Pattern — UGC NET Electronic Science
| Parameter | Details |
|---|---|
| Subject Code | 27 |
| Paper | II (Subject-specific) |
| Total Questions | 100 MCQs |
| Total Marks | 200 |
| Duration | 3 hours (combined with Paper I) |
| Negative Marking | None |
| Mode | Computer-Based Test (CBT) |
Unit 1: Electronic Devices and Circuits
This foundational unit covers semiconductor physics, diode characteristics, and transistor operations — essential for all subsequent units.
Key Topics
- Semiconductor Physics: Energy bands, intrinsic and extrinsic semiconductors, carrier transport — drift, diffusion, Hall effect, continuity equation.
- Junction Diodes: p-n junction formation, I-V characteristics, ideal vs. real diode, small-signal model, rectifiers (half-wave, full-wave, bridge), clippers, clampers, Zener diode regulators.
- Bipolar Junction Transistor (BJT): NPN/PNP, modes of operation, common-emitter/base/collector configurations, h-parameters, biasing circuits (fixed bias, self-bias, voltage divider bias), small-signal equivalent circuits, Ebers-Moll model.
- Field-Effect Transistors: JFET characteristics (ID-VDS), MOSFET (enhancement & depletion types), CMOS, biasing, pinch-off voltage, transconductance.
- Special Devices: SCR (thyristor), DIAC, TRIAC, UJT — operating principles and applications.
- Optoelectronic Devices: LED, photodiode, phototransistor, solar cell, LDR, optocoupler.
| Device | Type | Key Parameter | Application |
|---|---|---|---|
| Zener Diode | p-n junction | Zener voltage Vz | Voltage regulation |
| BJT | Bipolar | Current gain β (hfe) | Amplification, switching |
| MOSFET | Unipolar | Transconductance gm | Digital ICs, RF |
| SCR | Thyristor | Holding current Ih | Power control |
| LED | Optoelectronic | Forward voltage ~2V | Display, indicators |
Unit 2: Analogue Circuits
Amplifier design, feedback theory, and operational amplifiers form the backbone of analogue electronics.
- Amplifier Analysis: Single-stage and multistage BJT/FET amplifiers, voltage gain, input/output impedance, bandwidth, frequency response, Bode plots, gain-bandwidth product.
- Feedback Amplifiers: Types of feedback (series-shunt, series-series, shunt-shunt, shunt-series), effect on gain, bandwidth, input/output impedance, stability; Barkhausen criterion.
- Oscillators: RC phase-shift, Wien bridge, Hartley, Colpitts, Clapp, crystal oscillators; frequency stability.
- Power Amplifiers: Class A, B, AB, C, D; push-pull configuration, crossover distortion, efficiency.
- Operational Amplifiers: Ideal op-amp parameters, inverting/non-inverting amplifiers, summer, integrator, differentiator, instrumentation amplifier, comparator, Schmitt trigger, precision rectifier, log/antilog amplifiers.
- Active Filters: Butterworth, Chebyshev, Bessel; first- and second-order low-pass, high-pass, band-pass, notch filters using op-amps.
- Voltage Regulators: Series and shunt regulators, 78xx/79xx ICs, LM317 adjustable regulator, fold-back current limiting, switch-mode power supplies (SMPS) — buck, boost, buck-boost.
Unit 3: Digital Electronics
Boolean algebra through synchronous sequential circuits — the digital foundations of modern computing.
- Number Systems: Binary, octal, hexadecimal; BCD, Gray code, excess-3; arithmetic operations, 1's/2's complement.
- Boolean Algebra and Logic Gates: Boolean theorems, De Morgan's laws, SOP/POS forms, Karnaugh map minimisation (up to 6 variables), Quine-McCluskey method.
- Combinational Circuits: Multiplexer, demultiplexer, decoder, encoder, priority encoder, adder (half/full), subtractor, carry-look-ahead adder, BCD adder, magnitude comparator, parity generator/checker.
- Sequential Circuits: SR, D, JK, T flip-flops; master-slave configurations; timing diagrams; registers (SISO, SIPO, PISO, PIPO); ripple and synchronous counters; modulo-N counters; ring and Johnson counters.
- Programmable Logic: PLA, PAL, CPLD, FPGA — architecture and programming basics.
- Memory Devices: SRAM, DRAM, ROM, PROM, EPROM, EEPROM, Flash; memory expansion; address decoding.
- Logic Families: TTL (74 series), ECL, CMOS — noise margin, fan-out, propagation delay, power dissipation, interfacing.
| Logic Family | Supply Voltage | Propagation Delay | Power Dissipation |
|---|---|---|---|
| TTL (74LS) | 5 V | ~9.5 ns | ~2 mW/gate |
| CMOS (74HC) | 2–6 V | ~9 ns | Very low (static) |
| ECL (10K) | −5.2 V | ~2 ns | ~25 mW/gate |
| CMOS (74AHC) | 2–5.5 V | ~4 ns | Very low |
Unit 4: Microprocessors and Microcontrollers
- Intel 8085: Architecture (ALU, registers, flags), instruction set, addressing modes (immediate, register, direct, indirect), timing diagrams, interrupts (TRAP, RST 7.5/6.5/5.5, INTR), DMA, memory interfacing.
- Intel 8086: 16-bit architecture, segmented memory model, BIU and EU, pipeline, instruction set extensions (multiply, divide, string operations), minimum and maximum modes.
- 8051 Microcontroller: Internal architecture (4 KB ROM, 128 B RAM, 2 timers, 4 ports, UART), instruction set, memory organisation (SFRs), interrupts, serial communication, timer/counter modes.
- Advanced Architectures: RISC vs. CISC; ARM Cortex-M overview; pipelining (hazards — structural, data, control); cache memory (direct-mapped, associative, set-associative); virtual memory concepts.
- Interfacing: ADC, DAC, keyboard, display (7-segment, LCD), I2C, SPI, USB basics; programmable peripheral ICs (8255 PPI, 8254 timer, 8259 interrupt controller).
Unit 5: Signals and Systems
- Signals Classification: Continuous-time (CT) vs. discrete-time (DT); deterministic vs. random; energy vs. power signals; even/odd decomposition.
- System Properties: Linearity, time-invariance, causality, stability (BIBO); LTI system representation.
- Fourier Analysis: Fourier series (trigonometric and exponential forms); Fourier transform — properties (linearity, time-shift, frequency-shift, convolution, Parseval's theorem); DFT and FFT algorithm (radix-2).
- Laplace Transform: Definition, region of convergence, properties, inverse Laplace; transfer function, poles and zeros, system stability from pole location.
- Z-Transform: Definition, ROC, properties, inverse Z-transform (partial fractions, power series); analysis of discrete-time LTI systems.
- Sampling: Nyquist-Shannon sampling theorem, aliasing, anti-aliasing filter, reconstruction; practical ADC/DAC specifications.
- Correlation and Convolution: Cross-correlation, auto-correlation, power spectral density; convolution integral and sum.
Unit 6: Control Systems
- System Modeling: Transfer function, block diagram algebra (reduction rules), signal flow graphs (Mason's gain formula).
- Time Domain Analysis: First- and second-order systems; step, ramp, impulse response; steady-state error; error constants (Kp, Kv, Ka); effect of poles and zeros.
- Stability Analysis: Routh-Hurwitz criterion; Nyquist criterion; gain margin, phase margin; gain crossover, phase crossover frequencies.
- Frequency Domain: Bode plots (magnitude and phase); polar plots; M and N circles; Nichols chart.
- Root Locus: Construction rules; effect of gain K; dominant poles; conditional stability.
- Compensators: Lead, lag, lead-lag compensators; PID controller — tuning (Ziegler-Nichols method).
- State-Space Analysis: State variables and equations; controllability and observability (Kalman rank conditions); state feedback and pole placement.
Unit 7: Communication Systems
- Noise: Thermal (Johnson) noise, shot noise, flicker noise; noise figure, noise temperature; SNR; cascaded systems (Friis formula).
- Analogue Modulation: AM (DSB-SC, SSB, VSB) — generation and detection; FM and PM — deviation, modulation index, Carson's rule, FM demodulators (discriminator, PLL); superheterodyne receiver.
- Digital Modulation: PCM — sampling, quantisation (uniform/non-uniform, μ-law/A-law), encoding; DPCM, delta modulation; ASK, FSK, BPSK, QPSK, QAM — BER performance; OFDM basics.
- Information Theory: Shannon's entropy, mutual information, channel capacity (Shannon-Hartley theorem), source coding (Huffman, LZW), error control coding — Hamming codes, convolutional codes, turbo codes.
- Optical Fibre Communication: Single-mode and multi-mode fibres; dispersion; attenuation; LED/laser sources; PIN/APD detectors; WDM; SONET/SDH.
- Wireless Communications: Propagation models, path loss; FDMA, TDMA, CDMA; cellular concepts (frequency reuse, handoff); GSM, 3G/4G LTE overview; antenna parameters (gain, directivity, VSWR).
Unit 8: Electromagnetic Theory
- Electrostatics: Coulomb's law, Gauss's law, electric potential, capacitance, energy density, boundary conditions.
- Magnetostatics: Biot-Savart law, Ampere's law, Faraday's law, inductance, magnetic boundary conditions.
- Maxwell's Equations: Differential and integral forms; displacement current; wave equations; plane wave propagation; skin depth; Poynting vector.
- Transmission Lines: Telegrapher's equations; characteristic impedance; reflection coefficient; VSWR; standing waves; impedance matching (quarter-wave transformer, stub matching); Smith chart.
- Waveguides: Rectangular waveguide — TE and TM modes; cutoff frequency; phase and group velocity; characteristic impedance; cavity resonators.
- Antennas: Hertzian dipole, half-wave dipole, quarter-wave monopole; antenna arrays; radiation resistance; aperture antennas (horn, parabolic); RADAR fundamentals.
Unit 9: Instrumentation and Measurement
- Measurement Concepts: Accuracy, precision, resolution, sensitivity, linearity, hysteresis, repeatability; static and dynamic errors; calibration.
- DC/AC Instruments: PMMC, moving-iron, electrodynamometer; digital multimeter (DMM); CRT and DSO oscilloscopes; spectrum analyser; frequency counter.
- Bridge Circuits: Wheatstone, Kelvin, Schering, Maxwell, Hay, Owen bridges — derivation of balance conditions and applications.
- Signal Conditioning: Amplifiers, filters, A/D converters (successive approximation, flash, sigma-delta), D/A converters (R-2R ladder, weighted resistor); sample-and-hold circuits.
- Sensors and Transducers: Resistive (RTD, thermistor, strain gauge, potentiometer); capacitive (pressure, displacement); inductive (LVDT, RVDT, synchro); piezoelectric; thermocouple; Hall sensor; load cell.
- Virtual Instrumentation: LabVIEW concepts; data acquisition (DAQ) systems; GPIB, RS-232, USB, Ethernet interfaces; IEEE 488.2.
| Sensor Type | Measurand | Operating Principle |
|---|---|---|
| RTD (Pt100) | Temperature | Resistance ∝ Temperature |
| Thermocouple (K-type) | Temperature | Seebeck effect |
| Strain Gauge | Mechanical strain | Resistance change (GF~2) |
| LVDT | Linear displacement | Mutual inductance change |
| Piezoelectric | Pressure / vibration | Charge generation on stress |
Unit 10: Advanced Topics — VLSI and Embedded Systems
- VLSI Design Flow: Specifications → RTL design → synthesis → place-and-route → verification → fabrication; ASIC vs. FPGA; HDL (VHDL / Verilog basics).
- CMOS Fabrication: Silicon wafer; oxidation; photolithography; etching; ion implantation; CVD; metallisation; DRC and LVS.
- Combinational and Sequential VLSI Circuits: Static and dynamic CMOS; transmission gate logic; domino logic; latches and flip-flops in CMOS; clock distribution; power and timing analysis.
- Embedded Systems: Real-time operating systems (RTOS) — tasks, scheduling (RM, EDF), IPC; device drivers; bootloader; memory-mapped I/O; JTAG debugging.
- DSP Processors: Harvard architecture; MAC operation; pipelining; TMS320 series overview; FIR/IIR filter implementation on DSP.
- Emerging Areas: Internet of Things (IoT) — sensors, edge computing, MQTT; MEMS (accelerometers, gyroscopes); nanoscale CMOS challenges (short-channel effects, leakage); quantum computing basics (qubits, superposition, entanglement).
Important Books for UGC NET Electronic Science
| Book | Author | Topic Coverage |
|---|---|---|
| Electronic Devices and Circuit Theory | Boylestad & Nashelsky | Devices, BJT, FET, Op-Amps |
| Digital Integrated Electronics | Taub & Schilling | Digital circuits, logic families |
| Microprocessor Architecture | Gaonkar (8085) | 8085/8086 architecture & programming |
| Signals and Systems | Oppenheim & Willsky | Fourier, Laplace, Z-transform |
| Communication Systems | Haykin | Analogue & digital communication |
| Control Systems Engineering | Nise | Classical control theory |
| Electromagnetic Waves | Hayt & Buck | Maxwell, transmission lines |
| Electronic Instrumentation | Kalsi | Measurement & instrumentation |
📚 Preparation Strategy: Spend the first month on Devices + Digital (Units 1–3); second month on Signals, Control, Communication (Units 4–7); third month on EM Theory, Instrumentation, VLSI (Units 8–10). Solve 15–20 MCQs daily from each unit. Previous-year papers (2018–2024) are extremely predictive.
Previous Year Paper Analysis (2019–2024)
| Unit | Approx. Questions | High-Yield Topics |
|---|---|---|
| Electronic Devices | 10–12 | BJT biasing, FET characteristics, special devices |
| Analogue Circuits | 12–15 | Op-amp applications, feedback, oscillators |
| Digital Electronics | 12–15 | K-map, flip-flops, counters, logic families |
| Microprocessors | 10–12 | 8085 instruction set, interrupts, interfacing |
| Signals & Systems | 10–12 | Fourier transform, sampling, Z-transform |
| Control Systems | 8–10 | Bode plot, root locus, Routh criterion |
| Communication | 10–12 | AM/FM, PCM, Shannon capacity, BER |
| EM Theory | 8–10 | Maxwell equations, transmission lines, waveguides |
| Instrumentation | 8–10 | Bridges, transducers, ADC/DAC |
| VLSI & Embedded | 6–8 | CMOS design, FPGA, RTOS |
Frequently Asked Questions
Is Electronic Science difficult for NET?
It is calculative but predictable. The syllabus is stable, and previous-year questions repeat concepts. A candidate with a strong B.Sc./B.Tech. Electronics foundation can crack it with 4–5 months of focused preparation.
Can B.Sc. Electronics students appear for UGC NET Electronic Science?
Yes. Any candidate with at least 55% marks (50% for reserved categories) in M.Sc./M.Tech. Electronics, Electronic Science, or a related discipline from a recognised university is eligible.
Is VLSI important for UGC NET Electronic Science?
It is part of Unit 10 and typically contributes 6–8 questions. Focus on CMOS logic, FPGA vs. ASIC, and basic HDL concepts rather than deep fabrication chemistry.
Are there any coaching institutes specialising in UGC NET Electronic Science?
Some online platforms (Physics Wallah, Unacademy, Gradeup/BYJU's Exam Prep) offer NET Electronics courses. Self-study with standard textbooks and previous-year papers is equally effective.
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