5EX4-ANALOG COMMUNICATION |
Units: I-NOISE EFFECTS IN COMMUNICATION SYSTEMS: |
Resistor noise, Networks with
reactive elements, Noise temperature, Noise bandwidth, effective input noise temperature, Noise figure.
Noise figure & equivalent noise temperature in cascaded circuits.
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Units: II-AMPLITUDE MODULATION: |
Frequency translation, Recovery of base band signal,
Spectrum & power relations in AM systems. Methods of generation & demodulation of AM-DSB, AMDSB/
SC and AM-SSB signals. Modulation & detector circuits for AM systems. AM transmitters &
receivers. |
Units: III-FREQUENCY MODULATION: |
Phase & freq. modulation & their relationship, Spectrum &
band width of a sinusoidally modulated FM signal, phasor diagram, Narrow band & wide band FM.
Generation & demodulation of FM signals. FM transmitters & receivers.. Comparison of AM, FM & PM. Pre
emphasis & deemphasis. Threshold in FM, PLL demodulator.
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Units: IV-NOISE IN AM AND FM: |
Calculation of signal-to-noise ratio in SSB-SC, DSB-SC, DSB with
carrier, Noise calculation of square law demodulator & envelope detector.Calculation of S/N ratio in FM
demodulators, Super heterodyne receivers.
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Units: V-PULSE ANALOG MODULATION: |
Practical aspects of sampling: Natural and flat top
sampling. PAM, PWM, PPM modulation and demodulation methods, PAM-TDM.
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