Transcription of Chapter 8 Frequency Modulation (FM) Contents
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Chapter 8 Frequency Modulation (FM) Contents
Chapter 8 Frequency Modulation (FM)ContentsSlide 1 Frequency Modulation (FM)Slide 2FM Signal Definition (cont.)Slide 3 Discrete-Time FM ModulatorSlide 4 Single Tone FM ModulationSlide 5 Single Tone FM (cont.)Slide 6 Narrow Band FMSlide 7 Bandwidth of an FM SignalSlide 8 Demod. by a Frequency DiscriminatorSlide 9FM Discriminator (cont.)Slide 10 Discriminator Using Pre-EnvelopeSlide 11 Discriminator Using Pre-Envelope (cont.)Slide 12 Discriminator Using Complex EnvelopeSlide 13 Phase-Locked Loop DemodulatorSlide 14 PLL AnalysisSlide 15 PLL Analysis (cont. 1)Slide 16 PLL Analysis (cont. 2)Slide 17 Linearized Model for PLLS lide 18 Proof PLL is a Demod for FMSlide 19 Comments on PLL PerformanceSlide 20FM PLL vs. Costas Loop BandwidthSlide 21 Laboratory Experiments for FMSlide 21 Experiment Making an FMModulatorSlide 22 Experiment FM Modulator (cont. 1)Slide 23 Experiment Spectrum of an FMSignalSlide 24 Experiment 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
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