Lect12_Analog Modulation (II)

Lect12_Analog Modulation (II) - ECE 620 Introduction to RF...

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Unformatted text preview: ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Analog Modulation (II) 12 1 Outline AM Modulation FM Modulation PM Modulation 2 Amplitude Modulation (AM) 3 + m(t) A v c (t) v AM (t) ( ) ( ) ( ) [ ] ( ) ( ) ( ) ( ) ( ) ( ) [ ] t f f t f f M t f A t v t f t f M A t v t f t v t f M t m c m c m c AM c m AM c C m + + + = + = = = 2 sin 2 sin 2 2 sin ) ( 2 sin 2 cos ) ( 2 sin ) ( 2 cos ) ( Carrier Sidebands A M = index modulation Modulation Index 4 A M Increase modulation index high peak-to-average ratio S 50% (t) t t S 100% (t) t S 150% (t) M/A = 50% M/A = 100% M/A= 150% DSB & DSB-SC Double Sideband signal carries USB and LSB spectrum BW = 2f m Double information BW SSB is more BW efficient but requires filtering or IQ modulator A=0 Double Sideband Suppressed Carrier (DSB-SC) Lower power More efficient 5 m(f) f c f c-f m f f c-f c +f m-f m f c +f m USB LSB DSB f c-f m f c-f c f c +f m DSB-SC Envelope Detection...
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Lect12_Analog Modulation (II) - ECE 620 Introduction to RF...

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