🎓AC Notes Pdf 🕮 | Analog Communication System JNTU free lecture notes

Here you can download the free lecture Notes of Analog Communication System Pdf Notes – AC Notes pdf materials with multiple file links to download. Analog Communication Pdf notes book starts with the topics covering Introduction AC, DSB modulation, SSB modulation, angle modulation concepts, angle modulation methods, noise etc.

Analog Communication System Pdf Notes – AC Notes

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AC Notes – Analog Communication Pdf free download

UNIT I INTRODUCTION

Introduction to communication system, Need for modulation, Frequency Division Multiplexing, Amplitude Modulation, Definition, Time domain and frequency domain description. Single tone modulation, power relations in AM waves, Generation of AM waves, square law Modulator, Switching modulator, Detection of AM Waves; Square law detector, Envelope detector.

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UNIT II DSB MODULATION

Double side band suppressed carrier modulators, time domain and frequency domain description, Generation of DSBSC Waves. Balanced Modulators, Ring Modulator, Coherent detection of DSB-SC Modulated waves, COSTAS Loop. Radio Transmitter – Classification of transmitters , AM Transmitter Block Diagram and explanation of each block.

An analog communication system is a communication system where the information signal sent from point A to point B can only be described as an analog signal. An analogy communication system looks like the image below

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UNIT III SSB MODULATION : Analog Communication Pdf – AC Notes

Frequency domain description, Frequency discrimination method for generation of AM SSB Modulated Wave, Time domain description, Phase discrimination method for generating AM SSB Modulated waves. Demodulation of SSB Waves, Vestigial side band modulation: Frequency description, Generation of VSB Modulated wave, Time domain description, Envelope detection of a VSB Wave pulse Carrier, Comparison of AM Techniques, Applications of different AM Systems.

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UNIT IV ANGLE MODULATION CONCEPTS: Analog Communication Pdf – AC Notes

Basic concepts, Frequency Modulation: Single tone frequency modulation, Spectrum Analysis of Sinusoidal FM Wave, Narrow band FM, Wide band FM, Constant Average Power, Transmission bandwidth of FM Wave -Comparison of FM & AM.

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UNIT V ANGLE MODULATION METHODS

Generation of FM Waves, Direct Method, Parametric variation method, varactor diode, reactance modulator, indirect method: arm strong method. Detection of Fm waves : Balanced frequency discriminator, zero crossing detector, phased lock loop, foster see discriminator, ratio detector, FM transmitter block diagram and explanation of each block.

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UNIT VI NOISE: Analog Communication Pdf – AC Notes

Noise in Analog communication System, Noise in DSB& SSB System Noise in AM System, Noise in Angle Modulation System, Threshold effect in Angle Modulation System, Pre-emphasis & de-emphasis

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UNIT VII RECEIVERS

Radio Receiver – Receiver Types – Tuned radio frequency receiver, Super hetrodyne receiver, RF section and Characteristics – Frequency changing and tracking. Intermediate frequency, AGC, FM Receiver, Comparison with AM Receiver, Amplitude limiting.

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UNIT VIII PULSE MODULATION

Time Divison Multiplexing, Types of Pulse modulation, PAM (Single polarity, double polarity) PWM: Generation & demodulation of PWM, PPM, Generation and demodulation of PPM

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FAQs:

Q1: What is Modulation and it’s types?

A1: Modulation is the process of changing some characteristics (amplitude, frequency or phase) of a carrier wave in accordance with the instantaneous value of the modulating signal. There are 3 types:

1. Amplitude modulation
2. Frequency modulation
3. Phase modulation

You may download pdf from Smartzworld to know more about each types of modulation

Q2: What is transmission efficiency of an AM wave?

A2: Transmission efficiency is the ratio of the power carried by the sidebands to the total transmitted power.

Q3: What is low and high level modulation?

A3: In low level modulation, the modulation takes place prior to the output element of the final stage of the transmitter. The modulation in high level modulators, takes place in the final element of the final stage. Final stage is a place where the carrier signal is at its maximum amplitude. For low level AM modulator, class A amplifier is used and for high level modulator, class C amplifier is used.

Q4: What is Local Oscillator tracking?

A4: Ability of the oscillator to oscillate in a receiver either below or above the selected radio frequency carrier is called tracking. The amount with which it oscillates must be equal to the intermediate frequency throughout the entire radio frequency band.

TEXTBOOKS : 1. Principles of Communication Systems – H Taub & D. Schilling, Gautam Sahe, TMH, 2007 3rd Edition. 2. Communication Systems – B.P. Lathi, BS Publication, 2006.

Note :- These notes are according to the r09 Syllabus book of JNTUH. In R13 ,8-units of R09 syllabus are combined into 5-units in r13 syllabus. Click here to check all the JNTU Syllabus books.