NITH SYLLABUS

EC-222ANALOG COMMUNICATION SYSTEMS
CreditsLTP
4310

UNIT-1

MODULATION TECHNIQUES
  • Various Frequency Bands Used for Communication
  • Types of Communication and Need of Modulation
  • Introduction to AM
  • FM
  • PM
  • Frequency Spectrum of AM Waves
  • Representation of AM
  • Power Relation in AM Waves
  • Need and Description of SSB
  • Suppression of Carrier
  • Suppression of Unwanted Side-bands
  • Independent Sideband System
  • Vestigial Sideband System
  • Mathematical Representation of FM
  • Frequency Spectrum of AM Waves
  • Phase Modulation
  • Comparison Between Analog and Digital Modulation
  • Wideband and Narrow Band FM

UNIT-2

AM TRANSMITTERS AND RECEIVERS
  • AM Transmitters: Generation of AM
  • Low Level and High Level Modulation
  • AM Transmitter Block Diagram
  • Collector Class C Modulator
  • Base Modulator
  • Transistor Vander Bill Modulator
  • DSB S/C Modulator
  • AM Receiver: Tuned Radio Frequency (TRF) Receiver
  • Super Heterodyne Receiver
  • RF Section and Characteristics
  • Mixers
  • Frequency Changing and Tracking
  • IF Rejection and IF Amplifiers
  • Detection and Automatic Gain Control (AGC)
  • AM Receiver Characteristics

UNIT-3

FM TRANSMITTERS AND RECEIVERS
  • FM Transmitters: Basic Requirements and Generation of FM
  • FM Modulation Methods: Direct Methods
  • Variable Capacitor Modulator
  • Varactor Diode Modulator
  • FET Reactance Modulator
  • Transistor Reactance Modulator
  • Pre-emphasis
  • Direct FM Modulator
  • AFC in Reactance Modulator
  • Disadvantages of Direct Method
  • Indirect Modulators
  • RC Phase Shift Modulators
  • Armstrong FM Systems
  • FM Receivers: Limiters
  • Single and Double-Tuned Demodulators
  • Balanced Slope Detector
  • Foster-Seeley or Phase Discriminator
  • De-emphasis
  • Ratio Detector
  • Block Diagram of FM Receivers
  • RF Amplifiers
  • FM Receiver Characteristics

UNIT-4

SSB TRANSMITTERS AND RECEIVERS
  • Generator of SSB
  • Balanced Modulator Circuit
  • Filter Method
  • Phase Shift Method
  • Third Method
  • Phase Cancellation Method
  • Demodulation of SSB
  • Product Demodulator
  • Diode Detection Technique of SSB

UNIT-5

PULSE MODULATION TECHNIQUES
  • Pulse Amplitude Modulation and Demodulation
  • Pulse Width Modulation and Demodulation
  • Pulse Position Modulation and Demodulation
  • Sampling Theorem
  • Time Division Multiplexing
  • Frequency Division Multiplexing
BOOKS
  1. Electronic communication Systems by G. Kennedy, McGraw-Hill Education Publisher.
  2. Principals of Communication System by Taub & Schilling, McGraw-Hill Education Publisher.
  3. Electronic communication Systems by S. Haykin, Wiley India Pvt. Limited Publisher.
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