S.D.M.
Jainmatt Trust®
A.G.M RURAL COLLEGE OF ENGINEERING AND TECHNOLOGY, VARUR,
HUBLI
DEPARTMENTOFELECTRONICS AND COMMUNICATION ENGINEERING
NOTES
Subject with code:Electronic Principles and Circuits (BEC303)
Module 5
Prepared By
Prof. ASIF IQBAL MULLA
Department of Electronics and Communication
Syllabus :
Power Amplifiers: Amplifier terms, Two load lines, Class A Operation, Class B operation, Class
B push pull emitter follower, Class C Operation.
Thyristors: The four layer Diode, SCR, SCR Phase control, Bidirectional Thyristors, IGBTs,
Other Thyristors.
Amplifier Terms
Classes of operation
Types of Coupling
Range of frequency
Signal Levels
Two load lines
DC load line
AC load line
Class A Operation
Power gain of Class A amplifier
Output power of class A amplifier
Transistor power dissipation
Drain current
Efficiency of Class A amplifier
Emitter follower power amplifier
Class B Operation
Class B Push Pull amplifier
Advantages of Class B push pull amplifier
Disadvantages of Class B push pull amplifier
Class B push pull emitter follower
DC load line
AC load line
Class C Operation
Load line of class C amplifier
Thyristors
The four layer diode
Positive feedback
Closing latch
The Shockley diode
Breakover characteristics
The silicon controlled rectifier(SCR)
The SCR phase control
Bidirectional Thyristors
Diac
Traic
IGBTs(Insulated gate bipolar transistor)
Basic Construction
IGBT Control
Other Thyristors
Photo SCR
Gate Controlled Switch
Silicon Controlled Switch
Unijunction transistor
Programmable unijunction transistor (PUT)
