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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.
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