Chapter 8 Frequency Modulation (FM) Contents

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Chapter 8Frequency Modulation (FM)ContentsSlide 1Frequency Modulation (FM)Slide 2FM Signal Definition (cont.)Slide 3Discrete-Time FM ModulatorSlide 4Single Tone FM ModulationSlide 5Single Tone FM (cont.)Slide 6Narrow Band FMSlide 7Bandwidth of an FM SignalSlide 8Demod. by a Frequency DiscriminatorSlide 9FM Discriminator (cont.)Slide 10Discriminator Using Pre-EnvelopeSlide 11Discriminator Using Pre-Envelope (cont.)Slide 12Discriminator Using Complex EnvelopeSlide 13Phase-Locked Loop DemodulatorSlide 14PLL AnalysisSlide 15PLL Analysis (cont. 1)Slide 16PLL Analysis (cont. 2)Slide 17Linearized Model for PLLSlide 18Proof PLL is a Demod for FMSlide 19Comments on PLL PerformanceSlide 20FM PLL vs.

c[ωc +kωm(t)] ×{cos2[ω ct+θm(t)]+sin2[ωct+θm(t)]} = A2 c[ωc +kωm(t)] (20) The bandwidth of an FM discriminator must be at least as great as that of the received FM signal which is usually much greater than that of the baseband message. This limits the degree of noise reduction that can be achieved by preceding the

  Modulation