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. Costas Loop BandwidthSlide 21 Laboratory Experiments for FMSlide 21 Experiment Making an FMModulatorSlide 22Experiment FM Modulator (cont. 1)Slide 23 Experiment Spectrum of an FMSignalSlide 24Experiment FM Spectrum (cont.)

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 is six times

  Frequency, Modulation, Frequency modulation