GATE ECE by Subject
Studyloaf's GATE Electronics and Communication posts and practice, grouped by the subjects of the official GATE 2027 EC syllabus. Each post takes one narrow question, answers it first, and works it through with real numbers and labelled diagrams.
GATE EC question of the day
In the circuit in the figure, drives an inverting amplifier (, ) and a non-inverting amplifier (, ); their outputs feed, each through , the inverting input of a third op-amp with feedback and its non-inverting input grounded. What is ?
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Key idea: The third op-amp is an inverting summer, and the first two outputs add to exactly .
Official answer: A
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Practice and planning
Free GATE ECE 2027 tracker spreadsheet
A workbook for Excel or Google Sheets with every topic in the official GATE 2027 EC and General Aptitude syllabi, grouped by section. Mark each topic's status and confidence and it schedules your revision, and it also has a dashboard of days left and progress by subject, an error log, a daily log, a 100-day plan and the official GATE EC papers from 2021 to 2026 with their answer keys.
Download the tracker (.xlsx, 54 KB) or, with nothing to download, use the syllabus tracker in your browser.
Free to use. Not affiliated with IIT Madras or any GATE organising institute.
Networks
Circuit analysis, sinusoidal steady state, transients with the Laplace transform, and two-port networks. GATE 2027 EC syllabus, Section 2: Networks, Signals and Systems.
Topic posts
- How Do You Find Thevenin Resistance With No Independent Source?
- Why Does Resistance Lower Q in Series RLC but Raise It in Parallel?
Guides
- Thevenin and Norton Theorems for GATE, with Solved Examples
- Network Theory Formulas to Know for GATE EC and EE
Everything on Networks, by topic
GATE EC Networks, Signals and Systems Previous Year Questions with Solutions
Electronic Devices
Energy bands and carriers, carrier transport, and the P-N junction, BJT, MOSFET and optoelectronic devices. GATE 2027 EC syllabus, Section 3: Electronic Devices.
Topic posts
- How Does a Diode's Small-Signal Resistance Change With Bias Current?
- Why Does the Early Effect Give a BJT a Finite Output Resistance?
- How Far Does the Fermi Level Move When You Dope Silicon?
- Why Does a Zener Diode Hold Its Voltage, and When Does It Stop?
Guides
Everything on Electronic Devices, by topic
GATE EC Electronic Devices Previous Year Questions with Solutions
Analog Circuits
Diode circuits, BJT and MOSFET amplifiers and their frequency response, current mirrors, differential amplifiers and op-amp circuits. GATE 2027 EC syllabus, Section 4: Analog Circuits.
Topic posts
- How Much Does the Miller Effect Cut Common-Emitter Bandwidth?
- Why Does an Op-Amp Integrator Saturate, and How Long Does It Take?
GATE EC Analog Circuits Previous Year Questions with Solutions
Digital Circuits
Number representation, combinational and sequential circuits, timing, data converters, memories and computer organization. GATE 2027 EC syllabus, Section 5: Digital Circuits.
Topic posts
- What Do Students Get Wrong About Don't-Cares in K-Maps?
- How Do You Calculate Setup and Hold Slack for a Flip-Flop Path?
- How Many Flip-Flops Does a Mod-N Counter Need?
GATE EC Digital Circuits Previous Year Questions with Solutions
Signals and Systems
LTI systems, Fourier series and transform, sampling, and discrete-time signals with the DTFT, DFT and z-transform. GATE 2027 EC syllabus, Section 2: Networks, Signals and Systems.
Topic posts
- Why Does a Fourier Series Overshoot by 9% at Every Jump?
- Why Can the Same Z-Transform Belong to Two Different Signals?
Guides
GATE EC Networks, Signals and Systems Previous Year Questions with Solutions
Control Systems
Transfer functions and block diagrams, transient and steady-state response, stability criteria, Bode and root-locus plots, compensators and state equations. GATE 2027 EC syllabus, Section 6: Control Systems.
Topic posts
- How Does the Nyquist Criterion Handle a Pole on the jω Axis?
- What Do You Do When a Routh Array Has a Zero in the First Column?
GATE EC Control Systems Previous Year Questions with Solutions
Communications
Random processes, analog and digital modulation, information theory, detection, and error correction. GATE 2027 EC syllabus, Section 7: Communications.
Topic posts
- How Does a Hamming (7,4) Syndrome Point to the Flipped Bit?
- Why Can't AM Put More Than a Third of Its Power in the Sidebands?
GATE EC Communications Previous Year Questions with Solutions
Electromagnetics
Maxwell's equations, plane waves, transmission lines and the Smith chart, waveguides, optical fibres and antennas. GATE 2027 EC syllabus, Section 8: Electromagnetics.
Topic posts
- How Do You Find a Load's Reflection Coefficient From Vmax and Vmin?
- Why Does Copper at 1 GHz Carry Current in Only a 2 µm Layer?
GATE EC Electromagnetics Previous Year Questions with Solutions
Official syllabus
The subjects above follow the sections of the GATE 2027 EC syllabus published by IIT Madras, the organising institute. Read the official GATE 2027 EC syllabus (PDF). For exam dates and every GATE guide, see the GATE 2027 hub.