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8/19/2019 Voltage Amplifier Op Amp
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Voltage Amplife
CREATED BY: BINTANG MOHAMMADNPM: 14!!4"#$1
ME%ATRONI%A & "
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Co'te't(
• I'tro)*+tio'• Operatio'al Amplifer
• I)eal Op Amp
•
I',erti'g Amplifer• No'i',erti'g Amplifer
• -ampel Pro.lem a') -ol*tio'
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I'tro)*+tio'
+
-
Non-inverting input
Positive voltage supply
Negative voltage supply
O
Symbol
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Operatio'al Amplifer / Op Am
The Op Amp Model+
-Inverting input
Non-inverting input
Rin
v+
v-
+-
A(v+
-v-)
Ro
• The op amp is designed to sense the difference between the voltage
signals applied to the two input terminals and then multiply it by a
gain factor A such that the voltage at the output terminal is A(v+-v-)
• The voltage gain A is very large (practically infinite) The gain A is
often referred to as the differential gain or open-loop gain
• The input resistance Rin is very large (practically infinite) The output
resistance Ro is very small (practically !ero)
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I)eal Op Amp
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Voltage AmpliferI',erti'g Co'fg*ratio'
Ge'eral E*atio'(:i1 2 ,i'3R1i 2 i1,o 2 &iR 2 &,i'R3R1
A, 2 R3R1 2 R13R
T5e (ame a((*mptio'(f') t5e e*atio'( 6or t'o'i',erti'g +o'fg*raal(o *(e) 6or t5e i',er+o'fg*ratio'7
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I'p*t a') O*tp*t Re(i(ta'+eI)eall89 t5e i'p*t re(i(ta'+e 6or t5i( +o'fg*ratio' i( e*i,ale't to R17
Hoe,er9 t5e a+t*al ,al*e o6 t5e i'p*t re(i(ta'+e i( gi,e' .8 t5e 6olloi'g6orm*la:
Ri' 2 R1 ; R
1 ; AO<I)eall89 t5e o*tp*t re(i(ta'+e i( =ero9 .*t t5e 6orm*la .elo gi,e( a morea++*rate ,al*e:
Ro 2 Ro
1 ; AOere't 6rom t5e e*atio' *(e)
R1 ; R o' t5e pre,io*( (li)e9 5i+5 +a' .e +o'6*(i'g7
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I',erti'g Co'fg*ratio'E?ample
Gi,e': ,i' 2 7! V9
R1 2 " @ 9 AO<
Ri' 2 M 9 R
i'): ,o 9 i 9 A, 9
-ol*tio':
,o 2 &iR 2 &,i'R3R1 2 &/7!"903" 2 1" V
i 2 i1 2 ,i'3R1 2 1 3 " 2 7 mA
A, 2 R3R1 2 "9 3 " 2 1 2 R13R 2 " 3 "9 2 71
Ri' 2 R1 ; R 2 " ; "9 2 "97
1 ; AO< 1 ; 49
Ro 2 Ro 2 ! 2 17!$ m
1 ; AO
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No'i',erti'g Amplifer
,i) 2 ,o3AO<
A((*mi'g AO
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T5e +lo(e)&loop ,oltage gai' i( (8m.oli=e) .8 A, a') i( 6o*') to .e: A, 2 ,o 2 R ; 1
,i' R1
T5e origi'al +lo(e) loop gai' e*atio' i(:
A, 2 A 2 AO<
1 ; AO
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I'p*t a') O*tp*t Re(i(ta'+eI)eall89 t5e i'p*t re(i(ta'+e 6or t5i( +o'fg*ratio' i( i'f'it89 .*t t5e a
+lo(er pre)i+tio' o6 t5e a+t*al i'p*t re(i(ta'+e +a' .e 6o*') it5 t5e6olloi'g 6orm*la:
Ri' 2 Ri' /1 ; AO
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No'i',erti'g Co'fg*ratio' E?ample
-ol*tio':
,o 2 ,i' ; ,i'R 2 7! ; 7!"?1 2 !7! V i 2 ,i' 2 7! 2 7F
mA
R1 " R1 "
A, 2 R ; 1 2 "?1 ; 1 2 11 2 1 2 1 2 #7#?1&F
R1 " AO