Which Electronics and Telecommunication topics matter most for UPSC ESE (IES)?

Analog Electronics, Amplifiers and Operational Amplifiers, Signals, Systems and Communication Engineering carry the highest question counts based on previous-year analyses.

Is this Electronics and Telecommunication material free?

Yes — every chapter, practice set and flashcard deck here is free. Premium mock tests and live courses from tutors are labelled separately.

UPSC ESE (IES)Electronics and Telecommunication

Electronics and Telecommunication for UPSC ESE (IES)

Analog and digital electronics, signals and communication, electromagnetics, lines and antennas.

📊 E&T stream: Prelims Paper II and both Mains papers

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How toppers play this section

Write the formula before the numbers, and convert decibels to ratios.

Chapters

Built to the UPSC ESE (IES) blueprint — notes, shortcuts, solved PYQ-style examples and practice in every chapter.

1Analog Electronics, Amplifiers and Operational AmplifiersDiode circuits and rectifier figures, BJT and MOSFET biasing and small-signal gain, feedback and its four topologies, op-amp circuits with gain-bandwidth and slew rate, oscillators and the Barkhausen condition, and power-amplifier efficiencies.⏱ 8 min read

2Digital Electronics, Data Converters and MicroprocessorsNumber systems and Boolean simplification, combinational blocks (adders, multiplexers, decoders), flip-flops, counters and timing, logic families, ADC and DAC resolution, memory addressing, and the 8085 microprocessor with its flags, interrupts and addressing.⏱ 9 min read

3Signals, Systems and Communication EngineeringLinear time-invariant systems, convolution and the Fourier transform, sampling and aliasing; amplitude and frequency modulation with bandwidth and power; noise; PCM and digital modulation; and information theory with Shannon capacity and error-control codes.⏱ 8 min read

4Electromagnetics, Transmission Lines, Waveguides and AntennasMaxwell's equations and plane waves, reflection and skin depth; transmission-line reflection, VSWR and quarter-wave matching; rectangular waveguide cutoff and guide wavelength; and antenna parameters with the Friis transmission formula.⏱ 8 min read

Topic-wise weightage in UPSC ESE (IES)

Expected question counts from previous-year paper analyses. Topics with an arrow already have a full chapter.

Topic	Prelims Q	Priority
Analog Electronics, Amplifiers and Operational Amplifiers	~Large share	Very high
Digital Electronics, Data Converters and Microprocessors	~Medium share	High
Signals, Systems and Communication Engineering	~Large share	Very high
Electromagnetics, Transmission Lines, Waveguides and Antennas	~Medium share	High