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SYLLABUS

Unit-1

SEMICONDUCTOR DIODE: Open circuited pn junction, PN junction as a rectifier, Current components in a PN diode, Diode equation and its mathematical derivation, Volt-ampere characteristics, Energy band diagram of PN diode, Temperature dependence of volt-ampere characteristics, Diode resistance (static and dynamic resistance), Transition capacitance, Diffusion capacitance, Step graded junction.

Unit-2

SPECIAL DEVICES: Avalanche breakdown, V-I characteristics of zener diode, Zener breakdown, Principle of operation and characteristics of tunnel diode with the help of energy band diagram, Photo diode, Led, Pin diode and varactor diode, Silicon controlled rectifier (SCR) and its V-I characteristics, DIAC, TRIAC, schottky barrier diode, Solar cell, Uni-junction transistor (UJT) and its V-I characteristics, Problem solving.

Unit-3

DIODE APPLICATIONS: Diode as switch, Rectifier – Half wave and Full wave rectifier, Bridge rectifier, Ripple factor, PIV, Filters – Inductor and capacitor filter, L-section filter, pi-Filter, Zener as voltage regulator, Clipping and Clamping circuits, Detector, Voltage doubler, Problem solving related to diode applications.

Unit-4

BIPOLAR JUNCTION TRANSISTOR (BJT): Transistor – Structure, Current components and their relationship, PNP and NPN transistors - Active mode of operation, Symbols and conventions, Transistor equations, Transistor as an amplifier, Input and output characteristics of common base, Common emitter and common collector configurations. DC analyses of Common Base, Common emitter and common collector circuits. BJT BIASING: Load line and modes of operations, Operating point, Bias stability, Fixed bias, Self bias, Stabilization against variations in ICO, VBE, β, Bias compensation, Thermal runaway, Condition for Thermal stability, Problem solving. Applications: As a switch, as an amplifier.

Unit-5

FIELD-EFFECT TRANSISTORS (FET): Metal Oxide Semiconductor Field-effect Transistor (MOSFET) - structures and V-I characteristics of n-channel enhancement mode MOSFET, Pchannel Enhancement mode MOSFET, N-channel depletion mode MOSFET, P-channel depletion mode MOSFET, Symbols and conventions, Complementary MOSFETs (CMOSFETs) - Structure, V-I characteristics, Symbols and conventions, Structure and V-I characteristics of nchannel and p-channel Junction Field Effect Transistors (JFET), Problem solving. BIASING CIRCUITS USING MOSFETS AND JFETS: Different configurations using MOSFETs and JFET, Load line and modes of operation, Different biasing circuits (self-bias, Voltage divider bias) using MOSFETs and JFETs, DC analysis of n-channel and p-channel MOSFETs (both Enhancement and Depletion modes), DC analysis of n-channel and p-channel JFETs, Problem solving. APPLICATIONS: MOSFETs, JFET as switch and small signal amplifier, CMOS as a switch.