00 Dasar Opamp
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@slametwibawanto-2007 1
Rangkaian dasar opamp
+
+Vcc
VEE
Inverting
input
Non-Inverting
input
OutputZin
Zout
A
Zin (impedansi input sangat besar arus input sangat kecil iin 0Zout (impedansi output sangat renda!
A (penguatan loop terbuka sangat tinggi A tak !ingga
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OPAMP IDEL(KONSEP N!K PE"AN#AN$AN%
1& !IDAK ADA A"S 'AN$ MASK KEINP! OPAMP
2& in ()% *in(+%
"EN#$A%& $'"AN A)I* NE#A%I
@slametwibawanto-2007 2
+
+Vcc
VEE
Inverting
input
Non-
Inverting
input
Output
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@slametwibawanto-2007 ,
A. Penguat Inverting
in
-
.
.o/t
in
"
"
i"
"-
i
=
=
=
)
+V
V
Vin Vout
" ".i i
V, 0
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@slametwibawanto-2007
B. Penguat Non Inverting
)
+V
V
Vout
" ".i i
Vin
V, Vin
in
.
.o/t
in
"
""%""(i
"-
i
+
=
+=
=
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@slametwibawanto-2007
)
+V
V
Vin
Vout Vin
". i = 0
V, Vin
C. Penyangga (Buffer, pengikut tegangan)
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@slametwibawanto-2007 3
D. Penjumlah
)
+V
V
Vin.
Vout
"2 ".i2 i
Vin/ ",i3
Vin "1i1
V, 0
.
in
in
in
.o/t
in
in
in
""
"
"
i""
"
"
iiii
++=
=
++=
++=
3
3
2
2
1
1
3
3
2
2
1
1
321
%("
"
"""4i5a
ininin
-
.o/t
---
321
321
++=
==
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@slametwibawanto-2007 7
E. Penguat Deferenial
)
+V
V
Vin.
Vout"
".
i
i
".
2in
.
.6
"""+
=
Vin
%("
"
"
"%
""
"%(
"
""(
""%
""(
%("
"
i""
i
inin
.
in
.in
.
.
.
in
.6
.
in6
.6
.6o/t
in6
12
12
1
1
1
1
=
+
+=
+=
+=
+=
=
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@slametwibawanto-2007
!. Penguat Intrumentai
)
+V
V
Vout"
".
".
Vin
"
)
)
"2
"2"1
Vin.
Pen8ana De.e9ensial
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@slametwibawanto-2007 :
1
1
2
1
12
1
1
21
1
1
2
2
1
2
12
1
2
2
22
1
12
21
22
1
ininininin
in;
ininininin
inA
inin
%"
"(
"
"%(
"
"
i"
"
"%
"
"(%(
"
"
i"
"
i
++==
=
+=+=
+=
=
%%("
"(
"
"
%(
"
"
inin
.
A;
.o
12
1
221 +=
=
%%("
"(
%""(%""(
inin
ininA;
12
1
2
1
1
22
1
2
21
2121
+=
++=
)
+V
V
Vout"
".
".
Vin
"
)
)
"2
"2"1
Vin.
)
+V
V
)
+V
V
Vout"
".
".
VinVin
"
)
)
)
"2
"2"1
Vin. i
)
+V
V
Vout"
".
".
Vin
"
)
)
"2
"2"1
Vin.
)
+V
V
)
+V
V
Vout"
".
".
VinVin
"
)
)
)
"2
"2"1
Vin. i
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@slametwibawanto-2007 10
Ka9a5te9isti5
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@slametwibawanto-2007 11
Vin 0
Idealn1a Vout 0
*en1ataan & Vout 2 0
)
+V
V
" ".
". #angkaian pen$ukung#3 O4set Nulling
)
+V
V
V
3
7
2
,
1
)'56
)
+V
V
+V
3
7
2
,
1
)'/78
#angkaian ofet nulling untuk %&' $an %&*+
Perlu $ipaang -fet Nulling
untuk memuat /ot 0 1 aat
/in 0 1
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@slametwibawanto-2007 12
#.3 9ecoupling :apasitors
)
+V
V
001/
001/
*apasitor 1ang dipasang pada setiap
pine catuda1a opamp3
ungsi&'emperkecil noise'eningkatkan da1a ta!an ter!adap
noise
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@slametwibawanto-2007 1,
De.e9enBe-Mo=e #ommon-Mo=e
l=e.e9ensiaemo=
$
i
o==
be9samaemo=
$
i
oB=
:'RR dide4iniskan sebagai berbandingan antara penguatan
mode de4erensial (#d dan penguatan mode bersama (common
mode; #c
B
=
$
$#M""=
Common &o$e #eje2tion #atio (C#)
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@slametwibawanto-2007 1
Pen/at 8an be95/alitas tini mens8a9at5an #M"" 8an sanat besa9
)
+V
V
Vin Vout
" ".
Rc
Pa=a
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@slametwibawanto-2007 1
+
+
+
A/
in
+
"1"2
"2
",
", "
"
"C 01",
o/t
Meno
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@slametwibawanto-2007 13
%o3pa !ilter
in
.
o/t
G
" =
000
0
2
1
==
==
=
o/t.B.
in
.o/t..B.
B.
GH.
"
""GH.
.#H
)
+V
V
Vin Vout
" ".
#.
#.
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@slametwibawanto-2007 17
9a4tar "ustaka
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"
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