Leure 4 Double Side Band Suppressed Carrier Dr. Ahed El-Mahdy
Double Side Band (DSB) Copare beween his equaion and he equaion o onvenional AM Dr. Ahed El-Mahdy
SDSB() () S() 0 CARRIER SIGNAL 0-0 0 0.05 0.1 0.15 0. 0.5 Tie[Se.] MODULATING BASEBAND SIGNAL 0 0-0 0 0.05 0.1 0.15 0. 0.5 Tie[Se.] DOUBLE SIDEBAND MODULATED SIGNAL 0 0-0 0 0.05 0.1 0.15 0. 0.5 Tie[Se.] Dr. Ahed El-Mahdy 3
SDSB() 5 0 DOUBLE SIDEBAND MODULATED SIGNAL 15 10 5 0-5 -10-15 -0-5 0 0.0 0.04 0.06 0.08 0.1 0.1 Tie[Se.] Phase Reversal Dr. Ahed El-Mahdy 4
Phase Reversal in DSB Dr. Ahed El-Mahdy
DSB Speru Dr. Ahed El-Mahdy
Dr. Ahed El-Mahdy a os a s os os a s os os a a S 1 1 1 1 a M MODULATING SIGNAL MODULATED (DSB) SIGNAL DSB Speru or Sinusoidal Modulaing Signal
M() SDSB() () () MODULATING SIGNAL MODULATED (DSB) SIGNAL 0 0 10 10 0 0-10 -10 a 10 v 10 Hz 00 Hz -0 0 0.05 0.1 Tie[Se.] 6-0 0 0.05 0.1 Tie[Se.] 6 4 4 0 0 50 100 150 00 50 Frequeny[Hz] Dr. Ahed El-Mahdy 0 0 50 100 150 00 50 Frequeny[Hz] LOWER SIDEBAND (LSB) UPPER SIDEBAND 8 (USB)
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
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
phai() a() XDSB() XDSB() 0 0-0 0 0.0 0.04 0.06 0.08 0.1 0.1 0.14 0.16 Tie[Se.] 0 0-0 0 0.0 0.04 0.06 0.08 0.1 0.1 0.14 0.16 Tie[Se.] 0 0-0 0 0.0 0.04 0.06 0.08 0.1 0.1 0.14 0.16 Tie[Se.] 00 MODULATING SIGNAL MODULATED (DSB) SIGNAL INSTANTANEOUS AMPLITUDE INSTANTANEOUS PHASE 0-00 0 0.0 0.04 0.06 0.08 0.1 0.1 0.14 0.16 Tie[Se.] Dr. Ahed El-Mahdy
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
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
Generaion o DSB Dr. Ahed El-Mahdy
(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
Generaion o DSB (Con.) () Balaned Modulaor s Dr. Ahed El-Mahdy
Coheren Deodulaion o DSB S() Dr. Ahed El-Mahdy
Coheren Deodulaion o DSB (Con.) S() Dr. Ahed El-Mahdy
Ee o Phase Error on Coheren Deodulaion o DSB S() Dr. Ahed El-Mahdy
Rearks on DSB Coheren deodulaion Phase Loked Loop Dr. Ahed El-Mahdy
Squaring Loop S() Dr. Ahed El-Mahdy
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
Volage Conrolled Osillaor (VCO) Dr. Ahed El-Mahdy
Cosas Phase Loked Loop _ Dr. Ahed El-Mahdy
Explanaion o Cosas Phase Loked Loop Dr. Ahed El-Mahdy
Dr. Ahed El-Mahdy Explanaion o Cosas Phase Loked Loop _ )] sin(4 )) sin(( )[ ( 1 )] sin(4 )) ( )[sin( ( 1 )] sin(4 ) )[sin( ( 1 0 0 0 v v v v v v A A A A A A
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
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
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
PLL Can Trak Phase or Frequeny Dr. Ahed El-Mahdy
Convenional AM versus DSB Dr. Ahed El-Mahdy
Reeber: Bandwidh o AM & DSB Dr. Ahed El-Mahdy