AE (B-TECH Electronics and Communication Engineering 4th)

1. HIGH FREQUENCY TRANSISTOR

The high frequency T model, common base short circuit current frequency response, alpha cutoff

frequency, common emitter short circuit current frequency response, hybrid pi CE transistor

model, hybrid pi conductance in terms of low frequency h parameters, CE short circuit current

gain obtained with hybrid pi model, current gain with resistive load.

2. LARGE SINGAL AMPLIFIERS

Class A direct coupled with resistive load, Transformer coupled with resistive load, design

theory, power amplifier design, harmonic distortion, power output, variation of output power with

load, thermal runaway, output transformer saturation, push-pull amplifiers, operation of class- A

push-pull amplifier, class- B push-pull amplifier, crossover distortion, class AB push-pull

amplifier, transistor phase invertor, conversion efficiency of class B amplifiers, design of ClassB

push-pull amplifier, complementary- symmetry amplifier.

3. MULTISTAGE AMPLIFIERS

Coupling of transistor amplifiers, frequency response of coupled amplifiers, cascading of RC

coupled amplifiers and their analysis. Tuned Amplifiers: single tuned, double tuned and stagger

tuned amplifiers and their analysis.

4. FEEDBACK IN AMPLIFIERS

Types of feedback, effect of negative feedback on gain, bandwidth, stability, distortion and

frequency response etc. Voltage series, current series, voltage shunt, current shunt feedback

circuits and their analysis.

5. OSCILLATORS

Conditions of oscillations. Different types of oscillators: RC Phase Shift, Wein Bridge, Hartley,

Colpitts and Crystal Oscillators. Derivation of expression for frequency and amplitude of these

oscillators.

6. REGULATED POWER SUPPLIES

Zener diode as Voltage Regulator, Transistor Series and Shunt Regulators, Current limiting, Line

and Load Regulation.