KTU B.Tech S4 Lecture Notes Analog Communication Engineering

KTU B.Tech S4 Lecture Notes Analog Communication Engineering

MODULE I

• Introduction, elements of communication system, time and frequency domains, Need for modulation
• Noise in communication system, shot noise, thermal noise, white noise, partition noise, flicker noise, burst noise, signal to noise ratio, noise figure, noise temperature
•  narrow band noise, representation in terms of in-phase and quadrature components, envelope and phase components, sine wave plus narrow band noise.

MODULE II

• Amplitude modulation: Sinusoidal AM modulation index, Average power, Effective voltage and current
• Nonsinusoidal modulation
•  Amplitude modulator circuits, Amplitude demodulator circuit
• AM transmitters

MODULE III

• AM Receiver
•  super heterodyne receiver, detector, tuning range, tracking, sensitivity and gain, Image rejection, double conversion, adjacent channel rejection, Automatic Gain Control (AGC).
•  Single Sideband Modulation,Principles, Balanced Modulators, Singly & Doubly Balanced Modulators
• SSB Generation, Filter Method, Phasing Method & Third Method
• SSB Reception, Modified SSB Systems
• Pilot Carrier SSB & ISB, Companded SSB

MODULE IV

• Angle modulation: Frequency modulation, Sinusoidal FM, Frequency spectrum, modulation index ,average power, Non-sinusoidal modulation, deviation ratio, comparison of AM and FM
•  Phase modulation, Equivalence between PM and FM
•  Sinusoidal Phase Modulation, Digital Phase Modulation.

MODULE V

• Angle modulator Circuits : Varactor Diode Modulators
•  Transistors Modulators
•  FM Transmitters: Direct & Indirect Methods.
•  FM receiver, slope detector,
• Ratio Detector,
• balanced slope detector,
• FosterSeeley discriminator,
• Quadrature detector
• PLL demodulator,
• Automatic Frequency Control, Amplitude limiters,
• Pre-emphasis and De-emphasis,
• Effect of noise in analog communication Systems- AM Systems, DSBSC AM, SSB AM, Angle modulation,
• Threshold Effect in Angle modulation.

MODULE VI

• Telephone systems, standard telephone set, basic call procedures and tones, DTMF, cordless telephones.