ESCUELA SUPERIOR POLITECNICA DE CHIMBORAZO FACULTAD DE IFORMATICA Y ELECTRONICA ESCUELA DE INGENIERIA ELECTRONICA TELECOMUNICACIONES Y REDES
COMUNICACIONES I
TEMA
DEMODULACION AM INTEGRANTES: YESENIA GOMEZ
MAGALI PILCO IVAN SILVA CURSO: QUINTO “B” FECHA: 28/11/2016
INTRODUCCION
Los d!"#"$%"s d!"#"$%"s ss%"&'s ss%"&'s "s%(d'dos "s%(d'dos )'#' *' %#'$s&s %#'$s&s+$ +$ d" $!o#&',+$ $!o#&',+$ %"$"$ )o# o-."%o !',*%'# "* ''$," d" *' s"'* **"$do*'s ' #'$os d" 345 )"#o ($' " **"'d' **"'d' *' s"'* '* #",")%o# #",")%o# s" 7'," $","s'#o **"'# *' $!o#&',+$ $!o#&',+$ ' s( #'$o o#$'* d" !#",("$,'s )'#' )od"# s"# "$%"$dd' S s" %#'%' d" ($' $!o#&',+$ so$o#' d"-" s"# **"'d' '* #'$o d" '(do 9 %#'%'&"$%os s&*'#"s d"-"$ #",-# *'s d!"#"$%"s ,*'s"s d" $!o#&',+$ Es%" )#o,"so )#o,"so '##-' '##-' &"$,o$' &"$,o$'do do s" $o&-#" d" d"&od(*',+$
"!",%:' "!",%:' "$ "* ";()o ";()o #",")%o# #",")%o# 9 #",-" #",-" "*
Es%" $!o#&" %"$" *' !$'*d'd d" "<)*,'# *' !o#&' d" ,+&o !(" d"s'##o**'do *' D"&od(*',+$ D"&od(*',+$ A& (%*'$do (%*'$do "* Mod(*" =L > ?2001 5 Mod(*" Mod(*" =L > ?@0025 *os ,('*"s )"#&%"$ &'9o# !',*d'd )'#' d"&od(*'# ' *' !#",("$,' d" )o#%'do#' d"s"'d'
OBJETIVOS
E$%"$d"# "* )#$,)o d" d"&od(*',+$ d" '&)*%(d I&)*"&"$%'# ($ d"&od(*'do# d" '&)*%(d ,o$ dodo I&)*"&"$%'# ($ d"&od(*'do# d" '&)*%(d ,o$ ($ d"%",%o# d" )#od(,%o
MARCO TEORICO
DEMODULACION AM
U$ )#o,"so d" d"&od(*',+$ "s so*o *' o)os,+$ d" ($ )#o,"so d" &od(*',+$ U$' s"'* A& "s ($' s"'* &od(*'d' ;(" "s '&)*%(d d" )o#%'do#' d" '*%' !#",("$,' '#'d' ,o$ '&)*%(d d" '(do d" -'.' !#",("$,' )'#' *' %#'$s&s+$ P'#' #",()"#'# *' s"'* d" '(do "$ "* #",")%o# "s $","s'#o "<%#'"# *' s"'* d" '(do d" ($' s"'* A& E* )#o,"so d" "<%#',,+$ d" ($' s"'* d" &od(*',+$ d" ($' s"'* &od(*'d' s" d"$o&$' d"&od(*',+$ o d"%",,+$ Es%o s" &("s%#' "$ *' !(#' 11) E$ "$"#'*5 *os d"%",%o#"s s" )("d"$ ,*'s!,'# "$ dos %)os d"%",%o#"s s$,#+$,os 9 's$,#+$,os
Figura 1-1: Demodulación AM
DIODO DETECTOR
P("s%o ;(" ($' s"'* &od(*'d' "$ A& "s *' s"'* d" ;(" *' '&)*%(d d" )o#%'do#' '#' ,o$ *' '&)*%(d d" &od(*',+$5 s" (%*' ($ &od(*'do# )'#' "<%#'"# *' s"'* &od(*'do#' o#$'* d" *' s"'* AM
E* d'#'&' d" -*o;("s d"* d"%",%o# d" dodos5 ;(" s" &("s%#' "$ *' !(#' 125 "s ($ Diagrama a bloques de demodulador r ectifcador Figura 1- 2:L' d"%",%o# 's$,#o$o %),o s"'* &od(*'d' A&un;(" $,*(9" %'$%o *'s o$d's d" *' &%'d
)os%' ,o&o *'s d" *' &%'d $"'%' s" ')*,' ' *' "$%#'d' d"* #",%!,'do# L' s"'* d" s'*d' #",%!,'d' "s *' &"d' "$o*"$%" )os%' &s ($ $"* d" CC 9 s" '*&"$%' ' ($ !*%#o d" )'so -'.o ,(9' s'*d' "s *' s"'* d" &od(*',+$ o#$'* ,o$ $"* d" CC A ,o$%$(',+$5 *' s"'* d" &od(*',+$ s" #",()"#'# "*&$'$do *' %"$s+$ d" CC L' 4(#' 1@ &("s%#' ($ ,#,(%o d" d"%",,+$ )#,%,o Los ,o&)o$"$%"s 31 32 3@ 3F U1 9 U2 ,o$s%%(9"$ dos '&)*!,'do#"s $"#so#"s ,o$",%'dos "$ ,'s,'d' )'#' o!#","# ($' '$'$,' 'd",('d' )'#' *' s"'* A& L' s"'* A& '&)*!,'d' "s #",%!,'d' )o# dodo D1 9 *("o '*&"$%'d' ' *' "$%#'d' d"* !*%#o )'s'-'.o ,o$s%#(do )o# C2 C@ 9 3 L' s"'* d" s'*d' d"* !*%#o d" )'so -'.o "s "* &"do "$o*"$%" )os%o ,o$ ($ $"* d" CC E* ,o$d"$s'do# CF s" (%*' )'#' )'s'# *os ,o&)o$"$%"s d" ,o##"$%" '*%"#$' &"$%#'s s" -*o;("' "* ,o&)o$"$%" d" ,o##"$%" ,o$%$('
Figura 1- 3: Circuito del diodo detector
DETECTOR DE PRODUCTO
L' d"&od(*',+$ )'#' *' s"'* AM %'&-H$ s" )("d" #"'*'# ,o$ "* &od(*'do# ";(*-#'do '$%"s &os%#'do D,7o d"&od(*'do# s" d"$o&$' d"%",%o# s$,#+$,o o d"%",%o# d" )#od(,%o L' !(#' 1F )#o)o#,o$' "* ,#,(%o $%"#$o d"* &od(*'do# -'*'$,"'do MC1F?6 S X AM ( t ) #")#"s"$%' *' s"'* AM 9 X c (t ) "s "* )o#%'do#5 9 s" "<)#"s'$ )o#
X AM ( t )= V DC [ 1 + mcos ( 2 πf m t ) ] [ V c cos ( 2 πf c t ) ] X c (t ) =V c cos ( 2 πf c t )
(1-1) (1 - 2)
S "s%'s dos s"'*"s "s%$ ,o$",%'d's ' *'s "$%#'d's d"* d"&od(*'do# d" ";(*-#o5 "$%o$,"s *' s'*d' d"* d"&od(*'do# d" ";(*-#o s"#
X out (t )=kx c (t ) × x AM ( t ) 2
X out (t )=
2
kV DC V c kV DC V c 2
+
2
(1 - 3) 2
m cos ( 2 πf c t ) +
kV DC V c 2
[1 + mcos ( 2 πf c t ) ] cos [ 2 ( 2 πf c t ) ]
Do$d" = "s *' '$'$,' d"* &od(*'do# -'*'$,"'do E* )#&"# %H#&$o "$ "* *'do d"#",7o d" *' E, 1@ #")#"s"$%' "* $"* d" ,,5 "* s"($do %H#&$o "s *' s"'* d" &od(*',+$ 9 "* %"#,"# %H#&$o "s *' s"'* '#&+$,' d" s"($do o#d"$ P'#' #",()"#'# *' s"'* d" &od(*',+$5 *' #'+$ d"-" "<%#'"#s" d" *' s"'* AM X out (t ) L' !(#' 1F &("s%#' "* ,#,(%o d"%",%o# d" )#od(,%o E* V31 ,o$%#o*' "* $"* d" "$%#'d' d" *' s"'* )o#%'do#' L' s"'* d" s'*d' d"* MC1F?6 )$ 12 "s "<)#"s'do )o# *' E, 1@ E* !*%#o )'s'-'.'s ,o$s%#(do )o# C5 C? 9 3? s" (%*' )'#' "*&$'# "* %"#,"# %H#&$o5 ;(" "s *' s"'* '#&+$,' d" s"($do o#d"$ "$ *' s"'* &od(*'d' AM E* )#&"# %H#&$o d" *' E, 1@ "s "* $"* d" CC ;(" )("d" s"# o-s%#(do )o# "* ,o$d"$s'do# C10 L' s"'* d" s'*d' d"&od(*'d' d" '&)*%(d "s d'd' )o# 2
X out ( t )=
kV DC V c 2
m cos ( 2 πf m t )
(1 – )
E, 1F #")#"s"$%' *' s"'* d" '(do Es d",#5 "* d"%",%o# d" )#od(,%o 7' "<%#'do *' s"'* d" '(do d" *' s"'* AM
Figura 1- 4: Circuito del detector de producto
DESARROLLO MATERIALES Y E!UIPOS UTILIZADOS
Mod(*o =L?2001 Mod(*o =L?@002 Os,*os,o)o 34 "$"#'do#
PROCEDIMIENTO D"#$# D%&%'&#
1 L' !("$%" d" *' s"'* AM "$ "s%" "<)"#&"$%o "s d" *' s'*d' d"* Mod(*'do# AM #"'*'d' "$ "* ,')%(*o @ 2 Es%'-*","# *' "$%#'d' d" *' s"'* d"* Mod(*'do# AM )'#' "* )o#%'do# d" 20&V))5 200JK o$d' s"$od'* 5 9 *' s"'* d" '(do d" 10&V))5 @JK o$d' s"$od'*
@ A.(s%'# "* V31 d"* Mod(*'do# AM )'#' o-%"$"# *' &<&' '&)*%(d d" *' s"'* d" s'*d' AM
F Co$",%" *' s'*d' d" *' s"'* AM ' *' "$%#'d' IP d"* dodo d"%",%o#
C'&-'# *' "$%#'d' "#%,'* d" '*,'$," '* ',o)*'&"$%o d" DC 9 o-s"#'# *' !o#&' d" o$d' d" s'*d' d"* '&)*!,'do# 9 "* dodo d"%",%o#5 '$o%'# *os #"s(*%'dos "$ *' %'-*' F1
6 C'&-'# *' !#",("$,' d" '(do ' 2JK 9 1JK5 9 #")%' "* )'so
A.(s%" "* )o#%'do# ' 20&V)) 5 @00JK o$d' s"$od'*5 9 "* '(do ' 20&V))5 @JK o$d' s"$od'*
8 A.(s%" "* V31 d"* Mod(*'do# AM )'#' o-%"$"# *' &<&' '&)*%(d d" *' s'*d' d" *' s"'* AM
? A.(s%" *' "$%#'d' "#%,'* d"* '*,'$," '* ',o)*'&"$%o d" DC 9 o-s"#" *' !o#&' d" o$d' d" s'*d' d"* '&)*!,'do# 9 d"* dodo d"%",%o#5 '$o%'# *os #"s(*%'dos "$ *' %'-*' F2
10 C'&-" *' !#",("$,' d" '(do ' 2JK 9 1=75 #")%' "* )'so ?
T'-*' F 1 V, 20&V)) 5 V& 10&V)) 5 ! , 200JK 4#",("$,' d" A(do
4o#&' d" o$d' d" "$%#'d'
4o#&' d" o$d' d" s'*d' d"* d"%",%o#
@ JK
2 JK
1 JK
T'-*' F 2 V, 20&V)) 5 V& 20&V)) 5 ! , @00JK 4#",("$,' d" )o#%'do#
4o#&' d" o$d' d" "$%#'d'
4o#&' d" o$d' d" s'*d' d"* d"%",%o#
@ JK
2 JK
1 JK
D"#$# D%&%'&#
1 L' !("$%" d" *' s"'* AM "$ "s%" "<)"#&"$%o "s d" *' s'*d' d"* Mod(*'do# AM #"'*'d' "$ "* ,')%(*o @
2 Es%'-*","# *' "$%#'d' d" *' s"'* d"* Mod(*'do# AM )'#' "* )o#%'do# d" 20&V))5 200JK o$d' s"$od'* 5 9 *' s"'* d" '(do d" 10&V))5 @JK o$d' s"$od'*
@ A.(s%'# "* V31 d"* Mod(*'do# AM )'#' o-%"$"# *' &<&' '&)*%(d d" *' s"'* d" s'*d' AM
F Co$",%" *' s'*d' d" *' s"'* AM ' *' "$%#'d' IP d"* dodo d"%",%o#
C'&-'# *' "$%#'d' "#%,'* d" '*,'$," '* ',o)*'&"$%o d" DC 9 o-s"#'# *' !o#&' d" o$d' d" s'*d' d"* '&)*!,'do# 9 "* dodo d"%",%o#5 '$o%'# *os #"s(*%'dos "$ *' %'-*' F1
6 C'&-'# *' !#",("$,' d" '(do ' 2JK 9 1JK5 9 #")%' "* )'so
A.(s%" "* )o#%'do# ' 20&V)) 5 @00JK o$d' s"$od'*5 9 "* '(do ' 20&V))5 @JK o$d' s"$od'*
8 A.(s%" "* V31 d"* Mod(*'do# AM )'#' o-%"$"# *' &<&' '&)*%(d d" *' s'*d' d" *' s"'* AM
? A.(s%" *' "$%#'d' "#%,'* d"* '*,'$," '* ',o)*'&"$%o d" DC 9 o-s"#" *' !o#&' d" o$d' d" s'*d' d"* '&)*!,'do# 9 d"* dodo d"%",%o#5 '$o%'# *os #"s(*%'dos "$ *' %'-*' F2
10 C'&-" *' !#",("$,' d" '(do ' 2JK 9 1=75 #")%' "* )'so ?
T'-*' F 1 V, 20&V)) 5 V& 10&V)) 5 ! , 200JK 4#",("$,' d" A(do
@ JK
2 JK
4o#&' d" o$d' d" "$%#'d'
4o#&' d" o$d' d" s'*d' d"* d"%",%o#
1 JK
T'-*' F 2 V, 20&V)) 5 V& 20&V)) 5 ! , @00JK 4#",("$,' d" )o#%'do#
@ JK
2 JK
4o#&' d" o$d' d" "$%#'d'
4o#&' d" o$d' d" s'*d' d"* d"%",%o#
1 JK
CUESTIONARIO 1 E* %+ '"',"&# $%+ $"#$# $%&%'&# F" (1-3). /" %+ 0+""'0$# #%0'"#*0+ μA 741 %/ $%/0+"*%0$#. 4',5+ %/ +0 /%60+ $% /0+"$07
2 E* %+ '"',"&# $%+ $%&%'&# $% #$,'&# F" (1-). /" +0 /%60+ #&0$#0 8 +0 /%60+ AM /#* 0/"*'9*"'0/. 4',5+ %/ +0 /%60+ $% /0+"$07
3 4C,5+ %/ +0 ,*'"9* $% R . C; # C %* +0 ",0 (1-)7
4C,5+ %/ +0 ,*'"9* $% VR1 # VR2 %* +0 ",0 (1-)7
< 4C,5+ %/ +0 ,*'"9* $% R< # R= %* +0 ",0 (1-)7
CONCLUSIONES:
L' d"&od(*',+$ ,o$ss%" "$ *' #",()"#',+$ d" *' s"'* d" “'(do” %#'$s&%d' ,o$ o%#' s"'* d" !#",("$,' &'9o# **'&'d' )o#%'do#'5 *' ,('* "s %#'$s&%d' "$ AM E$ "* dodo d"%",%o#5 *' s"'* “AM” "s !*%#'d' ' %#'Hs d" ($ ,#,(%o • s"$,**o ,o$s%%(do )o# ($ '&)*!,'do# o)"#',o$'*5 )'s' ' %#'Hs d" "**os 9 ' s( s'*d' s" "$,("$%#' ,o$ ($ dodo5 "* ,('* #",%!,' *' s"'* 9 ' %#'Hs d" ($os ,')',%o#"s )od#"&os o-%"$"# *' s"'* o#$'* )od"&os &"$,o$'# ;(" *' "$%'.' d"* ,#,(%o d"&od(*'do#5 ,o$ss%" "$ ;(" $o "s $","s'#o '.(s%'# ' *' !#",("$,' ' *' ,('* "s %#'$s&%d' *' s"'* )'#' s"# ,')%'d' "s d",#5 "* ,#,(%o D"&od(*'do# s" s$,#o$' ,o$ "* &od(*'do# d" !o#&' '(%o&%,'5 )o# d",#*o d" ($' &'$"#'5 )'#' *' o-%"$,+$ d" *' s"'* o#$'* L' s"'* #",()"#'d' $o "s d"* %odo )'#",d' ' *' s"'* o#$'* %#'$s&%d'5 9' ;(" )#"s"$%' ($' *"#' $,*$',+$ 7',' *' ;("#d' 9 )o# ,o$s",("$,' $o "s d"* %odo s"$od'* A7o#' -"$5 "* d"%",%o# )#od(,%o "s ($ ,#,(%o ($ )o,o &s ,o&)*".o5 9' ;(" (%*' &'9o# $:&"#o d" "*"&"$%os )'sos 9 ($ ,#,(%o $%"#'do ,*'#o ;(" *' s"'* #",()"#'d' "s &(,7o &'s )#",s' ' *' o#$'*5 )"#o 7'9 ;(" &"$,o$'# ;(" d"-"$ "s%'# s$,#o$'d's ' *' &s&' !#",("$,' "$ "* &od(*'do# 9 d"&od(*'do#5 )'#' 's )od"# #",()"#'# *' s"'* %#'$s&%d' •
