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Penguat Instrumentasi
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Operational Amplifier (Op-Amp)
Sifat Op-Amp Ideal
Resistansi input ( Rin=)
Resistansi output 0 (Rout=0)
Penguatan tegangan loop terbuka ( A=)
Bandwidth ( f= )
Tegangan offset 0
Jika V-= V+maka Vout= 0
Vin= V+- V-
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Inverting Amplifier
VinVout
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Inverting Amplifier
=
+ =
=
= 0
=0
=
=
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Summing Amplifier
V-
=
+
+ 3
=
+
+
3
3
0
=
0
+
0
+
3 0
3
=
+
+
33
Vout
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Non-inverting Amplifier
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Non-inverting Amplifier
= 0
+ =
0
=
=
=
= 1 +
=
=
IF
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Differential Amplifier
3=
+ 3
=3
+ 3 +
0
4=
0
+ 4
=4
+ 4
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Differential Amplifier
=
3
+ 3 + =
4
+ 4
3
+ 3+
+ 3 =
4
+ 4
= 3
+ (
+ 3
)(
4
+ 4)
Jika = dan 3 = 4
=3
=
3
One stage
instrumentation
amplifier
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Instrumentation Amplifier
Va
Vb
RG
R1
R2
R3
R4
R5
R6
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Instrumentation Amplifier
Penguatan pada input buffer
+ + =
=+ +
Jika R1= R2
=2
+ 1
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Instrumentation Amplifier
Penguatan pada differential amplifier 0
4+ 6=
6
=6
4+ 6
3+ 5=
5
5
3+ 5+
3
3+ 5 =
6
4+ 6
5
3 (
3+ 5
3 )(
6
4+ 6) =
Jika R3= R4 dan R5= R6
=5
3
( )
=5
3
2
+ 1
=5
3
2
+ 1
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Instrumentation Amplifier
Va
Vb
R1
mR1
nR1
R/a
R/a
R
R
