OPAMP 특강 - senslab.co.krsenslab.co.kr/Class/OPAMP%C6%AF%B0%AD.pdf · 1...
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Transcript of OPAMP 특강 - senslab.co.krsenslab.co.kr/Class/OPAMP%C6%AF%B0%AD.pdf · 1...
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SENS Sensors, Embedded controller & Network Systems
OPAMP
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SENS Sensors, Embedded controller & Network Systems
(Operational Amplifier)
Open loop gain 100,000
:
Differential amplifier
Open loop gain , Open loop .
OP Supply voltage .
OP amp
Inverting Input
Non-Inverting Input
Output
)( + = VVAVO
-
2
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SENS Sensors, Embedded controller & Network Systems
(8pin, 741 compatible)
Offset .
OP amp
2
3
6
4
7
Vee
1
5
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SENS Sensors, Embedded controller & Network Systems
OP amp
1.
2. Negative Feedback , .
-
3
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SENS Sensors, Embedded controller & Network Systems
i R2 .
+ GND , R2 Vout .
R1=1k, R2=10k , , -10 .
OP amp , .
Ideal OP amp
1RVi in= inout VR
RiRVV1
220 ==
Gain
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SENS Sensors, Embedded controller & Network Systems
OP amp
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4
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SENS Sensors, Embedded controller & Network Systems
OP amp
inout VRRiRVV1
220 ==
.
k ~ k .
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SENS Sensors, Embedded controller & Network Systems
-1
inVV =+
outVRRRV
21
1
+=
+ VV
outin VRRRV
21
1
+= ininout VR
RVRRRV )1(
1
2
1
21 +=+
=
Gain
OP amp
-
5
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SENS Sensors, Embedded controller & Network Systems
-2
inVRRRV
21
2
+=+
outVRRRV
21
1
+=
+ VV inout VRRRV
RRR
21
2
21
1
+=
+
inout VRRV1
2=
Gain
OP amp
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SENS Sensors, Embedded controller & Network Systems
OP amp
Voltage follower
R1=R2
( ),
-
6
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SENS Sensors, Embedded controller & Network Systems
OP amp
2
3
6
R
Vout
Vin
C(Integrator)
Vin
C GND .
Capacitor
RVi in=
dtdVCi = dti
CV =
1
dtVRC
V in=1
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SENS Sensors, Embedded controller & Network Systems
OP amp
(Adder)
1
11 RVi =
2
22 RVi =
)()(0 22
31
1
3213 VR
RVRRiiRVout +=+=
.
2
3
6
R1
R3
VoutVin1
R2Vin2
-
7
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SENS Sensors, Embedded controller & Network Systems
OP amp
(Comparator)
/ OP amp
OP amp Feedback ( - F/B ) , Open
10V , A=100,000
V+ +10V Saturated .
V- -10V Saturated .
)( + = VVAVout
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SENS Sensors, Embedded controller & Network Systems
Saw wave generator
OP amp
CCA VRRRV
43
4
+=
RC1
RV
AV
RV
-
8
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SENS Sensors, Embedded controller & Network Systems
VoltagetoPWMmodulation
Saw wave Amplitude Duty .
Carrier Frequency Amplitude .
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SENS Sensors, Embedded controller & Network Systems
+5V ~ -5V AVR A/D . Adder OP amp .
, 2.5V .
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SENS Sensors, Embedded controller & Network Systems
Adder , Offset
+ Offset
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SENS Sensors, Embedded controller & Network Systems
GainBandwidthProduct
< Typical open loop gain of a compensated OP AMP >
Unity Gain Frequency
-
10
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SENS Sensors, Embedded controller & Network Systems
+=
b
sAsA
1
1)( 0
The frequency dependence of the gain can be modeled as;
HzfAfsradA
bt
bt
0
0 /==
The unity gain bandwidth is also called as gain-bandwidth product.
GainBandwidthProduct
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