ADC (B-TECH Electronics and Communication Engineering 3rd)

Unit I Semiconductor diode

Theory of PN junction diode, Band structure of open circuited PN junction, Volt

Ampere Characteristics, Temperature Dependence of PN diode, LED, LCD and Photo- diodes, Tunnel diode,

Zener diode as Voltage Regulator.

Unit II Transistors

, Characteristics and Biasing Transistor, Types of Transistor, Transistor current

components, Transistor as an Amplifier, Transistor characteristics in CB, CE and CC modes. Operating point, bias

stability, various biasing circuits, stabilization against Ico, VBE and beta, Construction, Characteristics &

applications of Junction Field Effect Transistor (JFET), UJT and MOSFET.

Unit III Large Signal Amplifiers:

Class A direct coupled with resistive load, Transformer coupled with

resistive load, harmonic distortion, variation of output power with load, Push-Pull Amplifiers, operation of

class- B push-pull amplifier, crossover distortion, transistor phase inverter, complementary- symmetry

amplifier.

Unit IV Feedback Amplifiers and Oscillator:

Feedback Concept, Effect of negative feedback on gain,

bandwidth, stability, distortion and frequency Response, Sinusoidal Oscillators, Sinusoidal oscillators; criterion

for oscillation, Different types of oscillators: RC Phase Shift, Wein Bridge, Hartley, Colpitts and Crystal

Oscillators. Derivation of expression for frequency and amplitude of these oscillators.

Unit V Low & High Frequency Transistor Model:

Transistor Hybrid Model, h parameter equivalent circuit

of transistor, Analysis of transistor amplifier using h-parameters in CB, CE and CC configuration, The high

frequency T model, hybrid pi CE transistor model, hybrid pi conductance in terms of low frequency h

parameters.