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UANDISTAR Code No: V0425/R07 II B.Tech II Semester, Regular Examinations, Apr - 2011 ANALOG COMMUNICATION (Electronics and Communications Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. a) What is Amplitude modulation? show that the power required to transmit the AM wave is ( ) . 2 / 1 2 m P t + = Where P t – Total Power, P c – Carrier Power, m – Modulation Index (8M) b) Explain the principle of square law detector with a neat circuit diagram (8M) 2. a) Explain the generation of double side band suppressed carrier (DSB-SC) modulation. Write the necessary equations. (8M) b) Discuss the effect of frequency and phase error in demodulation of DSB-SC wave using synchronous detector (8M) 3. a) Explain filter method of generating SSB waves (8M) b) Compare SSB, DSB and VSB from the view point of generation, bandwidth requirement, power distribution and area of application (8M) 4. a) Explain the working of Armstrong method for FM generation with the help of neat block diagram. (8M) b) Explain the balanced slope detector method for FM demodulation. (8M) 5. a) Derive an expression for output SNR for FM demodulator (12M) b) Distinguish between pre-emphasis and de-emphasis with necessary figures (4M) 6. a) Explain the working of reactance tube type FM transmitter with a neat block schematic (8M) b) Discuss the carrier frequency requirements of a radio transmitter (8M) 7. a) Draw the block diagram of FM receiver and Explain its working (8M) b) Explain the following terms (8M) i) Sensitivity, ii) Selectivity, iii) Image frequency and its rejection 8. a) Bring out the differences between TDM and FDM. (8M) b) Explain the generation of PWM, with suitable circuit and waveforms. (8M) 1 of 1 SET - 1
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UANDISTAR Code No: V0425/R07 II B.Tech II Semester, Regular Examinations, Apr - 2011 ANALOG COMMUNICATION (Electronics and Communications Engineering) Time: 3 hours Max Marks: 80
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