Angle modulation

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Angle modulation

  1. 1. Friday, November 30, 2012Angle (Exponential)Modulation 1
  2. 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. 3. Friday, November 30, 2012Hence, in PM, the instantaneous frequency ωi varieslinearly with the derivative of the modulating signal 3
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  10. 10. H. W. Friday, November 30, 2012 10
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  12. 12. Friday, November 30, 2012If kf is very small (that is, if |kfa(t)| << 1), then all but the first two termsare negligible 12
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  15. 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
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  22. 22. bandwidth is unchanged so that B = 15 KHz Friday, November 30, 2012 22
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