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Angle modulation

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Transcript

  • 1. Friday, November 30, 2012Angle (Exponential)Modulation 1
  • 2. Friday, November 30, 2012Determine the instantaneous frequency of the signal The frequency of ф(t) is 5 Hz at t = 0 and increases linearly at a rate of 1 Hz per 2 second.
  • 3. Friday, November 30, 2012Hence, in PM, the instantaneous frequency ωi varieslinearly with the derivative of the modulating signal 3
  • 4. Friday, November 30, 20124
  • 5. Friday, November 30, 20125
  • 6. Friday, November 30, 20126
  • 7. Friday, November 30, 20127
  • 8. Friday, November 30, 20128
  • 9. Friday, November 30, 20129
  • 10. H. W. Friday, November 30, 2012 10
  • 11. Friday, November 30, 201211
  • 12. Friday, November 30, 2012If kf is very small (that is, if |kfa(t)| << 1), then all but the first two termsare negligible 12
  • 13. Friday, November 30, 201213
  • 14. Friday, November 30, 201214
  • 15. The Maximum and Minimum carrier frequencies are ωc + kf mp and ωc - kf mp Friday, November 30, 2012The deviation of carrier frequency is ± kf mp. 15
  • 16. Friday, November 30, 201216
  • 17. Friday, November 30, 201217
  • 18. Friday, November 30, 201218
  • 19. Friday, November 30, 201219
  • 20. Friday, November 30, 201220
  • 21. Friday, November 30, 201221
  • 22. bandwidth is unchanged so that B = 15 KHz Friday, November 30, 2012 22
  • 23. Friday, November 30, 201223
  • 24. Friday, November 30, 201224
  • 25. Friday, November 30, 201225
  • 26. Friday, November 30, 201226
  • 27. Friday, November 30, 201227

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