Department of Electronics & Communication Engineering

Name of the Subject: Analog Communications

Branch: III / IV ECE I Semester Lecture Duration : 45 Min.

Lesson Plan

Topics to be coveredSuggested Book

Page No

UNIT -I :INTRODUCTION

L1 R1,T2 P1-4; P7 BB

L2 Need for modulation T1 P144-145 BB

L3,L4 R1,T2 P35-39;P114-117 BB

L5 Single tone modulation T1,T2 P150-153;P117 BB

R1 P39 BB

L6 T1,T2 P153;P119-123 BB

L7 T1,T2 P155-157;P123-125 BB

L8 ProblemsUNIT -II :DSB MODULATION

L9 Introduction T2 P125 BB

Spectrum of the DSBSC Wave T2P126-127

BB

L10 T2 P127 BB

L11 T2 P130-132 BB

L12 COSTAS Loop Block diagram and its operation T2 P132 BB

L13

L14

UNIT -III :SSB MODULATION

L15 Spectrum of the SSB Wave T1,T2 P163;P138 BB

Name of the Faculty: Mr. V .Ajesh Kumar

Lecture No.

Topics as per JNTU syllabus

Teaching Methods

Introduction to communication system

Definition for communication,Block diagram of communication system

Definition for modulation; FrequencyMultiplexing, practicability of antennas, Narrow banding,Common processing

Amplitude Modulation: Definition, Time domain and frequency domain description

Representation of AM wave,Frequency spectrum of AM wave.

Analysis using single frequency component

Power relations in AM waves

Expression for Total power in the modulated wave

Generation of AM waves: Square law Modulator, Switching modulator

Circuit diagram,it's operation and related equations

Detection of AM Waves: Square law detector, Envelope detector.

Circuit diagram,it's operation and related equations

Double side band suppressed carrier modulation: Time domain and frequency domain descriptionGeneration of DSBSC Waves: Balanced Modulators, Ring Modulator

Circuit(Block) diagram and related equations

Coherent detection of DSB-SC Modulated waves

Radio Transmitters - Classification of Transmitters

AM Transmitter block diagram and explanation of each block.

Frequency domain description

L16 Block diagram and its operation T1,T2 P165;P141 BB

Time domain description BB

L17 Block diagram and its operation T1,T2 P167-169;P143-145 BB

L18 Coherent detection of an SSB T1,T2 P168-170;P146 BB

L19 Spectrum of the VSB Wave T1,T2 P171-172;P149 BB

L20 T2 P151 BB

Time domain description T1,T2 BB

L21 T2 P155 BB

L22 R4,T2 P195;P156-158 BB

L23 BB

L24 ProblemsUNIT -IV :ANGLE MODULATION CONCEPTS

L25 Angle Modulation T2 P180 BB

L26 T2 P183 BB

L27 T2 BB

L28 T2 P185-190 BB

Constant Average Power T2 P190 BB

L29 T2 P194 BB

L30

UNIT -V :ANGLE MODULATION METHODS

L31 T2,T1 P200;P213 BB

L32 Circuit diagram and it's operation R1 P107 BBReactance Modulator Theory of Reactance modulators R1 P101 BB

L33 R1 P110 BB

L34 T2 P202-207 BB

T2 P207-211 BB

L35 Circuit diagram and it's operation R1 P165-168 BB

Ratio Detector Circuit diagram and it's operation R1 P169-170 BB

L36 R1 BB

L37,L38 ProblemsUNIT -VI :NOISE

Frequency discrimination method for generation of AM SSB Modulated Wave

Phase discrimination method for generating AM SSB Modulated wavesDemodulation of SSB WavesVestigial side band modulation: Frequency descriptionGeneration of VSB Modulated wave

Block diagram of VSB modulator and demodulator

Envelope detection of a VSB Wave

Comparison of AM Techniques

Comparison of DSB-SC,SSB,VSB,DSB-C modulation techniques

Applications of different AM Systems.

Introduction, Basic definitions of phase and frequency modulation

Frequency Modulation: Single tone frequency modulation

Analysis of FM using single frequency component ,Modulation index,Frequency deviation.

Spectrum Analysis of Sinusoidal FM Wave

Spectra of sinsusoidally modulated FM signals for various values of β

Narrow band FM & Wide band FM

Narrow band FM-β small Wideband FM-β large

Transmission bandwidth of FM Wave

Carson's Rule

Comparison of FM & AM

Generation of FM Waves: Direct method:Parametric variation method

Use of voltage variable capacitor for frequency modulation

Varactor diode method

Indirect Method:Armstrong method

Blockdiargram of Armstrong frequency modulation system

Detection of FM Waves: Balanced Frequency discriminator

Circuit diagram ond it's frequency response

Zero crossing detector, Phase locked loop

Non linear model of Phase locked loop

Foster seeley Disriminator

FM Transmitter block diagram and explanation of each block.

L39 T2 P317-320 BB

Noise in AM System T2 P328-330 BB

L40,L41 T2 P322-328 BB

L42,L43 T2 P335-337 BB

L44 T2 P341-346 BB

L45 T2 P348-352 BB

UNIT -VII :RECEIVERSL46 Radio Receiver Introduction R1 P119 BB

L47 Block diagram and its operation R1 P119-122 BB

L48 Block diagram and its operation

L49 R1 P122-128 BB

L50 R1 P128-136

L51 Intermediate frequency R1 P128-136 BB

L52 AGC R1 BB

L53 FM Receiver R1 -9, P462-465 BB

L54 R1 -9, P465-468 BB

L55 Amplitude limiting Operation of the amplitude limiter T1,R1 -9, P468-471; -8, P387 BB

UNIT -VIII :PULSE MODULATION

L56 Introduction R1 P494 BB

L57,L58 R1 P494-496 BB

L59 R1 P496-498 BB

L60 Generation pf PPM from PWM R1 P498 BB

TEXTBOOKS :

REFERENCES :

Noise in Analog communication System

AM receiver model and Signal to Noise Ratio(SNR)Calculation of SNR and Figure of merit

Noise in DSB& SSB System

Calculation of SNR and Figure of merit

Noise in Angle Modulation System

Calculation of SNR and Figure of merit

Threshold effect in Angle Modulation System

Pre-emphasis & de-emphasis

Use of pre-emphasis and de-emphasis in FM system

Receiver Types: Tuned radio frequency receiverSuperheterodyne Receiver

RF section and Characteristics

Sensitivity,Selectivity,Image frequency and it's rejection,Adjucent channel selectivity

Frequency changing and tracking

Separately excited mixer,self excited mixer,Super heterodyne tracking,Local oscillatorChoice of frequency,Frequencies used,IF amplifiers

Block diagram and explanation of each block

Comparison with AM Receiver

Types of Pulse modulation

PAM(Single polarity, double polarity)

defininition for pulse amplitude modulation ;single polarity and double polarity PAM wavwforms

PWM: Generation & demodulation of PWM

Introduction;Generation of PWM wave using 555 timer in monostable mode of operation;

PPM: Generation and demodulation of PPM

1. Principles of Communication Systems – H Taub & D. Schilling, Gautam Sahe, TMH, 2007 3rd Edition.

2. Principles of Communication Systems - Simon Haykin, John Wiley, 2nd Ed.,.

1. Electronics & Communication System – George Kennedy and Bernard Davis,4th edition TMH 2009.

2. Analog Communications KN Haribhat & Ganesh Rao,Pearson Publications,2nd edition,2008

3. Communication Systems Second Edition – R.P. Singh, SP Sapre, TMH, 2007.

4. Communication Systems - B.P.Lathi, Bs publication, 2006.