Sunday, 23 September 2018

ELECTRONIC DEVICES NOTE

Electronic Devices and Circuits. Check Electronic Devices and Circuits Notes for GATE and Electronics & Communication Engineering exams preparation. The study notes are perfect approach to aware about which types of questions can be asked and how to make a plan of study to solve the questions easily. Electronic devices and circuits has many topics that can be studied with prepared study plan for upcoming GATE exam. Make sure you have good understanding of all topics and related materials.

In order to make electronic & communication engineering exam preparation smooth we have collected worth-reading resources like introduction of subject, important topics, formulas, best preparation books, weightage analysis, rapid revision study notes, champion study plan, combo quiz etc.

Thermoionic emission:- Thermionic emission is the phenomenon in which electrons are emitted by a metal contains free electrons which behave like the molecules of a perfect gas.Richardson Equation:-I = AT1/2e-b/T.Here I is the thermionic current density in amp per sq meter. T is the temperature on kelvin scale, A and b being constants.

A = ne√k/2πm, b = e?/k.(a) The minimum energy which is necessary for shifting electrons from valence band to conduction band is defined as band gap (Eg).(b) The forbidden energy gap between the valence band and the conduction band is known as band gap (Eg). i.e. Eg = Ec – Ev. (c) As there are energy levels f electrons in an atom, similarly there are three specific energy bands for the electrons in the crystal formed by these atoms.(d) Completely filled energy bands: The energy band, in which maximum possible numbers of electrons are present according to capacity is known as completely filled bank.

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