Double Side Band Suppressed Carrier

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1 Leure 4 Double Side Band Suppressed Carrier Dr. Ahed El-Mahdy

2 Double Side Band (DSB) Copare beween his equaion and he equaion o onvenional AM Dr. Ahed El-Mahdy

3 SDSB() () S() 0 CARRIER SIGNAL Tie[Se.] MODULATING BASEBAND SIGNAL Tie[Se.] DOUBLE SIDEBAND MODULATED SIGNAL Tie[Se.] Dr. Ahed El-Mahdy 3

4 SDSB() 5 0 DOUBLE SIDEBAND MODULATED SIGNAL Tie[Se.] Phase Reversal Dr. Ahed El-Mahdy 4

5 Phase Reversal in DSB Dr. Ahed El-Mahdy

6 DSB Speru Dr. Ahed El-Mahdy

7 Dr. Ahed El-Mahdy a os a s os os a s os os a a S a M MODULATING SIGNAL MODULATED (DSB) SIGNAL DSB Speru or Sinusoidal Modulaing Signal

8 M() SDSB() () () MODULATING SIGNAL MODULATED (DSB) SIGNAL a 10 v 10 Hz 00 Hz Tie[Se.] Tie[Se.] Frequeny[Hz] Dr. Ahed El-Mahdy Frequeny[Hz] LOWER SIDEBAND (LSB) UPPER SIDEBAND 8 (USB)

9 Insananeous Apliude, Phase, and Frequeny o DSB s A ( )os e j s Re C j s Re A ( ) e INSTANTANEOUS AMPLITUDE a A () C A () INSTANTANEOUS PHASE A () Dr. Ahed El-Mahdy INSTANTANEOUS FREQUENCY 1 d d

10 Insananeous Apliude, Phase, and Frequeny o DSB(single Tone) s a os os Asue A 1 s s Re C e j Rea os e j INSTANTANEOUS AMPLITUDE a a os Dr. Ahed El-Mahdy C a os INSTANTANEOUS FREQUENCY 1 d d INSTANTANEOUS PHASE a os 0 os os 0 0

11 phai() a() XDSB() XDSB() Tie[Se.] Tie[Se.] Tie[Se.] 00 MODULATING SIGNAL MODULATED (DSB) SIGNAL INSTANTANEOUS AMPLITUDE INSTANTANEOUS PHASE Tie[Se.] Dr. Ahed El-Mahdy

12 Dr. Ahed El-Mahdy Transied Power o DSB ) ( ) ( DSB signal envelopeo Coplex A C ) ( ) ( 1 A C P avg ] ) ( [ax ] ) ( [ax 1 ) ( ax 1 A A C P PEP Using Coplex Envelope

13 Calulaion o Transied Power o DSB using power speru I P avg () is S A 4 a p A 4 A baseband signal ( ) d M ( ( ) ( ) ( ) ) wih requeny onens uh less M ( ( ) ) d A 4 Power Speru Sp() han hen - Dr. Ahed El-Mahdy

14 Generaion o DSB Dr. Ahed El-Mahdy

15 (1) Produ Modulaor Generaion o DSB (a)blok diagra o he produ odulaor (b)baseband signal (odulaing signal) () DSB odulaed signal Dr. Ahed El-Mahdy

16 Generaion o DSB (Con.) () Balaned Modulaor s Dr. Ahed El-Mahdy

17 Coheren Deodulaion o DSB S() Dr. Ahed El-Mahdy

18 Coheren Deodulaion o DSB (Con.) S() Dr. Ahed El-Mahdy

19 Ee o Phase Error on Coheren Deodulaion o DSB S() Dr. Ahed El-Mahdy

20 Rearks on DSB Coheren deodulaion Phase Loked Loop Dr. Ahed El-Mahdy

21 Squaring Loop S() Dr. Ahed El-Mahdy

22 Volage Conrolled Osillaor (VCO) I he onrol signal is negaive, hen he VCO phase inreases. I he onrol signal is posiive, hen he VCO phase dereases. Dr. Ahed El-Mahdy

23 Volage Conrolled Osillaor (VCO) Dr. Ahed El-Mahdy

24 Cosas Phase Loked Loop _ Dr. Ahed El-Mahdy

25 Explanaion o Cosas Phase Loked Loop Dr. Ahed El-Mahdy

26 Dr. Ahed El-Mahdy Explanaion o Cosas Phase Loked Loop _ )] sin(4 )) sin(( )[ ( 1 )] sin(4 )) ( )[sin( ( 1 )] sin(4 ) )[sin( ( v v v v v v A A A A A A

27 Explanaion o Cosas Phase Loked Loop _ I has u o req. near zero. I as as inegraor o produe DC onrol volage o VCO Dr. Ahed El-Mahdy

28 Phase Loked Loop (PLL) e 1 1 ( ) A A0 [sin( 0 i)] A A0 [sin( )] 1 x( ) A A0 [sin( 0 i) sin(4 i 0)] 0 e S() LPF Filer H() Phase Shi 90 Dr. Ahed El-Mahdy

29 Noes: Phase Loked Loop (PLL) Noe ha he PLL is loked -90 degree ou o phase wih respe o he inoing signal. Then he oupu o he PLL needs o be shied by 90 degree so ha i will be in phase wih he arrier o he inpu signal. Dr. Ahed El-Mahdy

30 PLL Can Trak Phase or Frequeny Dr. Ahed El-Mahdy

31 Convenional AM versus DSB Dr. Ahed El-Mahdy

32 Reeber: Bandwidh o AM & DSB Dr. Ahed El-Mahdy

Principles of Communications Lecture 3: Analog Modulation Techniques (1) Chih-Wei Liu 劉志尉 National Chiao Tung University

Principles of Communications Lecture 3: Analog Modulation Techniques (1) Chih-Wei Liu 劉志尉 National Chiao Tung University Priniples of ouniaions Leure 3: nalog Modulaion Tehniques 1 hih-wei Liu 劉志尉 Naional hiao Tung Universiy wliu@wins.ee.nu.edu.w Oulines Linear Modulaion ngle Modulaion Inerferene Feedbak Deodulaors nalog