Electronic Devices

Electronic Devices for GATE Electronics and Communication Engineering, one topic per lesson: the theory in plain words, the formulas, a solved example, and GATE-style questions (MCQ, MSQ and NAT) whose numerical answers are recomputed by a program when the site is built.

Start the first lesson

1Semiconductor Basics

Semiconductor Physics: Carriers, Drift and DiffusionEnergy bands, intrinsic and extrinsic semiconductors, Fermi level, carrier concentrations and mass-action law, mobility, drift and diffusion currents, Einstein relation, generation and recombination.

2Junction Devices

PN Junction, Zener, LED and PhotodiodeBuilt-in potential, depletion width and junction capacitance, ideal diode equation, breakdown (Zener and avalanche), diffusion capacitance, LEDs, photodiodes and solar cells.

3Transistors

BJT and MOS Device PhysicsBJT current components, emitter efficiency, base transport factor, Early effect, MOS capacitor regions, threshold voltage, oxide capacitance, MOSFET I-V, channel-length modulation and body effect.