Transcription of Chapter 8 Frequency Modulation (FM) Contents - UMD
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Chapter 8 Frequency Modulation (FM) Contents - UMD
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.
Chapter 8 Frequency Modulation(FM) FM was invented and commercialized after AM. Its main advantage is that it is more resistant to additive noise than AM. Instantaneous Frequency The instantaneousfrequencyof cosθ(t) is ω(t) = d dt θ(t) (1) Motivational Example Let θ(t) = ωct. The instantaneous fre-quency of s(t) = cosωct is d dt ωct = ωc.
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