B.TECH IIIRD SEMESTER
ANALOG COMMUNICATION
(ECE-203E)
L T P THEORY : 100 Marks
3 1 - SESSIONAL : 50 Marks
TOTAL : 150 Marks
TIME : 3 Hrs.
UNIT – I
NOISE: Classification of Noise, Various sources of Noise, Methods of Noise Calculation in networks and inter connected networks. Addition of noise due to several sources; noise in amplifiers in cascade, noise in reactive circuits, Noise figure, its calculation and measurement. Noise temperature, Mathematical representation of random noise, narrow band noise and its representation. Transmission of noise through linear systems, signal to noise ratio, noise bandwidth.
UNIT-II
MODULATION TECHNIQUES: Basic constituents of Communication Systems, need of modulation,Amplitude modulation, spectrum of AM wave, modulation index, DSBSC modulation, SSB Modulation,Collector modulation, Square law modulation methods, Methods of generating SSB Signals, vestigial sideband modulation, Detection of AM Signal; Diode detector, Square Law Detector. Time Constant RC in diode detector. Diode detector with filter. FDM, Power relations in AM wave.
UNIT-III
ANGLE MODULATION: frequency and phase modulation, spectrum of FM Wave, modulation index and Bandwidth of FM Signal, NBFM and WBFM, Comparison between FM and PM Signals, FM and AM signals, AM and NBFM Signals, FM generation methods, Demodulation methods; slope detector, ratio detector, Foster-Seeley discriminator. Pre-emphasis & De-emphasis, effect of noise on carrier; noise triangle.
UNIT-IV
TRANSMITER AND RECEIVER: Classification of radio transmitters, Block diagram of AM transmitter,Frequency Scintillation, Frequency drift, Radio broadcast transmitter, Radio telephone transmitter, Privacy devices, Armstrong FM transmitter, Simple FM transmitter using Reactance modulator.
Classification of radio receivers, TRF receives, superheterodyne receivers, Image Signal rejection, frequency mixers. Tracking and alignment of receivers, Intermediate frequency, AGC, AFC, SSB receiver.
NOTE:
Eight questions are to be set in all by the examiner taking two questions from each unit. Students will be
required to attempt five questions in all.
ANALOG COMMUNICATION
(ECE-203E)
L T P THEORY : 100 Marks
3 1 - SESSIONAL : 50 Marks
TOTAL : 150 Marks
TIME : 3 Hrs.
UNIT – I
NOISE: Classification of Noise, Various sources of Noise, Methods of Noise Calculation in networks and inter connected networks. Addition of noise due to several sources; noise in amplifiers in cascade, noise in reactive circuits, Noise figure, its calculation and measurement. Noise temperature, Mathematical representation of random noise, narrow band noise and its representation. Transmission of noise through linear systems, signal to noise ratio, noise bandwidth.
UNIT-II
MODULATION TECHNIQUES: Basic constituents of Communication Systems, need of modulation,Amplitude modulation, spectrum of AM wave, modulation index, DSBSC modulation, SSB Modulation,Collector modulation, Square law modulation methods, Methods of generating SSB Signals, vestigial sideband modulation, Detection of AM Signal; Diode detector, Square Law Detector. Time Constant RC in diode detector. Diode detector with filter. FDM, Power relations in AM wave.
UNIT-III
ANGLE MODULATION: frequency and phase modulation, spectrum of FM Wave, modulation index and Bandwidth of FM Signal, NBFM and WBFM, Comparison between FM and PM Signals, FM and AM signals, AM and NBFM Signals, FM generation methods, Demodulation methods; slope detector, ratio detector, Foster-Seeley discriminator. Pre-emphasis & De-emphasis, effect of noise on carrier; noise triangle.
UNIT-IV
TRANSMITER AND RECEIVER: Classification of radio transmitters, Block diagram of AM transmitter,Frequency Scintillation, Frequency drift, Radio broadcast transmitter, Radio telephone transmitter, Privacy devices, Armstrong FM transmitter, Simple FM transmitter using Reactance modulator.
Classification of radio receivers, TRF receives, superheterodyne receivers, Image Signal rejection, frequency mixers. Tracking and alignment of receivers, Intermediate frequency, AGC, AFC, SSB receiver.
NOTE:
Eight questions are to be set in all by the examiner taking two questions from each unit. Students will be
required to attempt five questions in all.
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