# Electronic Circuits

#### Features Includes:

• 169 - 3D/2D Animation
• 591 Pages of Content
• 90 Lecture Hours
• 3 Solved Problems
• 286 Quiz
• Suitable for All Technical University Syllabus

#### Course Description

This course focus on explaining about transistor biasing and stablization, Small signal amplifiers, large signal amplifiers, multivibrators and special semiconductor devices

#### OBJECTIVES:

• Understand transistor baising and stabilization
• Familiarize small signal amplifiers
• Understand large signal amplifiers and oscillators
• Know about waveshapping circuits and multivibrators
• Gain knowledge about special semiconductor devices and circuits
###### UNIT - I UNDERSTAND TRANSISTOR BIASING

Transistor as an amplifier- Introduction of amplifier- Active devices used for amplification - Transistor as an amplifier - Graphical representation of CE amplifier -CE configuration is most widely used in amplifier circuit - Regions of operation of a transistor - Salient points of C.E. amplifier. Transistor load lines -Introduction to transistor load lines - DC load line- AC load line. Operating point and load line- Introduction to operating point and load line. Need of transistor biasing - Operation region of a transistor - Introduction of need for biasing- Introduction to faithful amplification- Problem. Fixed bias network – Fixed bias circuit - Design example for fixed bias circuit. Causes for instability of biasing - Causes for instability of biasing. Need for stabilization and stability factor - Need for bias stabilization. Collector to base bias circuit- Requirement of biasing circuits- Types of biasing circuits - Collector to base resistor bias - Collector to base bias derivations - Advantages and disadvantages of collector to base resistor bias. Voltage divider bias - Voltage divider bias (or) Self bias (or)Potential divider bias - Advantages of self bias. Thermal Stability- Thermal Stability - Thermal resistance - The Condition for thermal stability - Problem to calculate the value of thermal resistance. Bias Compensation - Bias Compensation -Need for Bias compensation - Types of bias compensation. Diode compensation - Diode compensation - Thermistor compensation - Sensistor compensation. Heat sinks- Necessity of heat sink - Heat sink - Different types of heat sinks.

###### UNIT - II SMALL SIGNAL AMPLIFIERS

Single stage CE amplifier and H-Parameter model–Practical transistor amplifier- The Hybrid equivalent model- H-Parameter analysis steps of transistor - Common-Emitter amplifier. Classification of amplifiers - Classification of amplifiers. Need for multistage amplifiers - Need for multistage amplifier- Multistage amplifier - Methods of coupling multistage amplifier. Gain, decibel gain, frequency response and bandwidth of an amplifier - Gain – Block diagram of two-stage CE cascaded amplifier – Use of dB.RC coupled amplifier - RC coupled amplifier. Frequency response of RC coupled amplifier- Frequency response of RC coupled amplifier - Advantages and disadvantages of RC coupled amplifier. Transformer coupled amplifier- Transformer coupled amplifier. Frequency response of transformer coupled amplifier - Frequency response of transformer coupled amplifier - Advantages and disadvantages of transformer coupled amplifier. Direct coupled amplifier- Direct coupled amplifier - Advantages and disadvantages of direct coupled amplifier- Comparison of different types of coupled amplifiers. Circuit of emitter follower- Emitter follower. Darlington pair- Darlington pair.Negative and positive feedback- Introduction of feedback - Positive and negative feedback- Advantages and disadvantages- Comparison of positive and negative feedback. Block diagram of negative feedback- Block diagram of feedback amplifier - Gain of negative feedback amplifier. Classification of negative feedback amplifiers. Classification of negative feedback amplifiers - Advantages of negative feedback amplifier. Different types of negative feedback amplifiers – Different types of negative feedback amplifies - Voltage series feedback amplifiers - Current series feedback amplifier - Current shunt feedback amplifier - Voltage shunt feedback amplifier - Comparison of different feedback amplifier. Effects of negative feedback- Expression for the gain of feedback amplifier- Effect of negative feedback on input impedance- Effect of negative feedback on output impedance - Effect of negative feedback on bandwidth of an amplifier.