EEC135_09_notes_2_mod_group_phase

EEC135_09_notes_2_mod_group_phase - Chapter II Modulation,...

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Chapter II Modulation, Group Velocity, and ispersion Dispersion Modulation and Spectrum roup Velocity and Phase Velocity Group Velocity and Phase Velocity Dispersion
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Modulation and Spectrum Coherent Waves 1 f(t) = A sin(2 f 0 t) F(f) = A ( f-f 0 ) 5 10 15 20 0.5 -1 -0.5 freq Modulated Waves f(t) = a(t) sin(2 f 0 t) F(f) = A(f)* ( f-f 0 ) 1 time 5 freq Prof. S. J. Ben Yoo EEC 135 Lecture notes 2_2 Copyright © S. J. B. Yoo All Rights Reserved f 0
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Modulation Index ave modulated by a single sinusoid Wave modulated by a single sinusoid Et  E o 1 m cos  t cos o t m: modulation index : information modulation frequency E(t) Example 0.5 1 m = 0.2  10 20 30 40 -0.5 Prof. S. J. Ben Yoo EEC 135 Lecture notes 2_3 Copyright © S. J. B. Yoo All Rights Reserved -1
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Modulation ave modulated by a single sinusoid, spectrum Wave modulated by a single sinusoid, spectrum Et  E o 1 m cos  t cos o t Prof. S. J. Ben Yoo EEC 135 Lecture notes 2_4 Copyright © S. J. B. Yoo All Rights Reserved
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Modulation (cont’d) Prof. S. J. Ben Yoo EEC 135 Lecture notes 2_5 Copyright © S. J. B. Yoo All Rights Reserved
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EEC135_09_notes_2_mod_group_phase - Chapter II Modulation,...

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