Angle_Modulation_and_Demodulation_1

# Angle_Modulation_and_Demodulation_1 - 3/3/2010 Bessel...

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3/3/2010 1 Angle Modulation and Demodulation Bessel Function AM vs. FM Single tone modulation with f c =1kHz, f m =50Hz. β =0.1 AM vs. FM for Single Tone Modulation

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3/3/2010 2 Example Estimate B FM and B PM for the modulating signal m(t) for k f =2 π x10 5 and k p =5 π . Assume the essential bandwidth of the periodic m(t) as the frequency of its third harmonic. Repeat the problem if m(t) is doubled to 2m(t) Repeat the problem if m(t) is time expanded to m(t/2) Generate and Demodulate FM Signals Narrowband FM (NBFM) Generation of Wideband FM Signals Two basic techniques for generating WBFM signals: Indirect Method Relies on the creation of a NBFM signal followed by a frequency multiplier Direct Method Relies on a voltage-controlled oscillator
3/3/2010 3 Frequency Multiplier A device that takes cos( θ (t)) and outputs cos(n θ (t)) is called a frequency multiplier. This can be done by passing signal through a nonlinear device

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## Angle_Modulation_and_Demodulation_1 - 3/3/2010 Bessel...

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