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.
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
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