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.

BT = 2(∆f +fm) Hz (16) where ∆f is the peak frequency deviation and fm is the maximum baseband message frequency component. Example Commercial FM signals use a peak frequency deviation of ∆f = 75 kHz and a maximum baseband message frequency of fm = 15 kHz. Carson’s rule estimates the FM signal bandwidth as BT = 2(75+15) = 180 kHz which ...

  Frequency, Modulation, Frequency modulation