AN-31 Op Amp Circuit Collection

52 Pages·2013·2.29 MB·English

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Application Report
AN-31 amplifier circuit collection
ABSTRACT
This application report provides basic circuits of the Texas Instruments amplifier collection.
Table of Contents
1 Basic Circuits..........................................................................................................................................................................3
2 Signal Generation.................................................................................................................................................................15
3 Signal Processing.................................................................................................................................................................24
4 References............................................................................................................................................................................41
Revision History.......................................................................................................................................................................41
List of Figures
Figure 1-1. Inverting Amplifier......................................................................................................................................................3
Figure 1-2. Non-Inverting Amplifier..............................................................................................................................................3
Figure 1-3. Difference Amplifier...................................................................................................................................................4
Figure 1-4. Low-Power Difference Amplifier................................................................................................................................4
Figure 1-5. Inverting Summing Amplifier.....................................................................................................................................5
Figure 1-6. Non-Inverting Summing Amplifier..............................................................................................................................5
Figure 1-7. Inverting Amplifier With High Input Impedance.........................................................................................................6
Figure 1-8. Two-Stage Inverting Amplifier With High Input Impedance.......................................................................................6
Figure 1-9. AC Coupled Non-Inverting Amplifier.........................................................................................................................7
Figure 1-10. Practical Differentiator.............................................................................................................................................7
Figure 1-11. Integrator.................................................................................................................................................................8
Figure 1-12. Current to Voltage Converter (Transimpedance Amplifier)......................................................................................8
Figure 1-13. Reference Voltage Generator..................................................................................................................................9
Figure 1-14. Neutralizing Input Capacitance to Optimize Response Time..................................................................................9
Figure 1-15. Threshold Detector for Photodiodes......................................................................................................................10
Figure 1-16. Double-Ended Limit Detector................................................................................................................................10
Figure 1-17. Multiple Aperture Window Discriminator................................................................................................................11
Figure 1-18. Offset Voltage Adjustment for Inverting Amplifiers................................................................................................12
Figure 1-19. Offset Voltage Adjustment for Non-Inverting Amplifiers........................................................................................12
Figure 1-20. Offset Voltage Adjustment for Voltage Followers..................................................................................................13
Figure 1-21. Offset Voltage Adjustment for Difference Amplifiers..............................................................................................13
Figure 1-22. Offset Voltage Adjustment for Inverting Amplifiers With Source Resistance.........................................................14
Figure 2-1. Sine Wave Generator With Low Component Count................................................................................................15
Figure 2-2. Sine Wave Generator..............................................................................................................................................15
Figure 2-3. Free-Running Multivibrator......................................................................................................................................16
Figure 2-4. Function Generator.................................................................................................................................................16
Figure 2-5. Pulse Width Modulator............................................................................................................................................17
Figure 2-6. Improved Howland Current Pump...........................................................................................................................18
Figure 2-7. Wien Bridge Oscillator With Automatic Gain Control..............................................................................................18
Figure 2-8. Positive Output Voltage Reference.........................................................................................................................19
Figure 2-9. Buffered Positive Voltage Reference.......................................................................................................................19
Figure 2-10. Negative Output Voltage Reference......................................................................................................................20
Figure 2-11. Buffered Negative Voltage Reference...................................................................................................................20
Figure 2-12. Current Sink..........................................................................................................................................................21
Figure 2-13. Current Source......................................................................................................................................................21
Figure 2-14. Voltage-to-Current Converter With BJT Output.....................................................................................................22
Figure 2-15. Voltage-to-Current Converter With Darlington Pair Output...................................................................................22
Figure 2-16. Voltage-to-Current Converter With MOSFET Output............................................................................................23
Figure 3-1. Instrumentation Amplifier.........................................................................................................................................24
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Figure 3-2. Variable Gain Instrumentation Amplifier..................................................................................................................25
Figure 3-3. Instrumentation Amplifier With ±100-V Common Mode Range...............................................................................25
Figure 3-4. Instrumentation Amplifier With ±10-V Common Mode Range.................................................................................26
Figure 3-5. High Input Impedance Instrumentation Amplifier....................................................................................................26
Figure 3-6. Bridge Amplifier With Temperature Sensitivity........................................................................................................27
Figure 3-7. Precision Diode.......................................................................................................................................................27
Figure 3-8. Precision Clamp......................................................................................................................................................27
Figure 3-9. Fast Half Wave Rectifier..........................................................................................................................................28
Figure 3-10. AC to DC Converter..............................................................................................................................................28
Figure 3-11. Peak Detector........................................................................................................................................................29
Figure 3-12. Absolute Value Amplifier........................................................................................................................................29
Figure 3-13. Sample and Hold I.................................................................................................................................................30
Figure 3-14. Sample and Hold II................................................................................................................................................30
Figure 3-15. Adjustable Q Notch Filter......................................................................................................................................31
Figure 3-16. Easily Tuned Notch Filter......................................................................................................................................32
Figure 3-17. Sallen-Key Two-Stage Bandpass Filter.................................................................................................................32
Figure 3-18. Two-Stage Capacitance Multiplier.........................................................................................................................33
Figure 3-19. Simulated Inductor................................................................................................................................................33
Figure 3-20. Capacitance Multiplier...........................................................................................................................................34
Figure 3-21. High Pass Sallen-Key Active Filter........................................................................................................................34
Figure 3-22. Low Pass Sallen-Key Active Filter.........................................................................................................................35
Figure 3-23. Current Monitor.....................................................................................................................................................35
Figure 3-24. Saturating Servo Preamplifier With Rate Feedback..............................................................................................36
Figure 3-25. Power Booster.......................................................................................................................................................36
Figure 3-26. Fast Zero Crossing Detector.................................................................................................................................37
Figure 3-27. Amplifier for Piezoelectric Transducer...................................................................................................................37
Figure 3-28. Temperature Probe................................................................................................................................................38
Figure 3-29. Photodiode Amplifier I...........................................................................................................................................38
Figure 3-30. Photodiode Amplifier II..........................................................................................................................................39
Figure 3-31. High Input Impedance AC Follower.......................................................................................................................39
Figure 3-32. Multiplier/Divider....................................................................................................................................................40
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www.ti.com Basic Circuits
1 Basic Circuits
R2 10k
-2.5 V
R1 10k
-
Vout
+ + +
Vin LMx58B/LM2904B
*R 10k
2.5 V
8 = F428
KQP 41 EJ
(cid:219)4 1LPEKJ=H PK 2NKPA?P ./358 & ./324
&ARE?AO BNKI 6N=JOEAJP %QNNAJP 5LEGAO
Figure 1-1. Inverting Amplifier
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic. To learn more about *R and how to protect LM358/LM2904 devices
from transient current spikes at the input, see [23].
R2 1k
-2.5 V
R1 1k
-
Vout
+
+
TLV9062
+
Vin 2.5 V
4
8 = 1+ 2 8
KQP l 4 p EJ
1
Figure 1-2. Non-Inverting Amplifier
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic.
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R2 2k
-15 V
R1 1k
-
R3 1k Vout
++
+ TLV9302
V1
R4 2k 15 V
+
V2
4 4 4
8 = 4 1+ 2 8 28
KQP l4 +4 pl 4 p 2F4 1
3 4 1 1
(KN 4 =4 =J@ 4 =4
1 3 2 4
4
8KQP =42:82F81;
1
Figure 1-3. Difference Amplifier
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic.
C2 10p
R2 20MEG
-1.8 V
R1 10MEG
-
Vout
R3 10MEG +
+
+ TLV379
Vin1
+ 1.8 V
Vin2 R4 20MEG C1 10p
8KQP =l434+444pl1+4412p82F441281
(KN 41=43 =J@ 42=44
8KQP =4412:82F81;
1
B?QPKBB =2Ł%242
Figure 1-4. Low-Power Difference Amplifier
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic.
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R1 1k R4 2k
R2 1k
-7.5 V
R3 1k
-
Vout
+
+
+ + + TLV9102
V1 V2 V3
*R5 250 7.5 V
8KQP =F44l4811+4822+4833p
(cid:219)45 1LPEKJ=H BKN +JLQP $E=O %QNNAJP %=J?AHH=PEKJ
Figure 1-5. Inverting Summing Amplifier
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic.
R1 10k R2 10k
-15 V
-
R3 10k Vout
+
+
OPA2990
R4 10k
15 V
+ +
V1 V2
8KQP =l1+4412pl81434+444+82434+344p
8KQP =l1+4412pl434+444p:81+82; EB 43=44
Figure 1-6. Non-Inverting Summing Amplifier
See Analog engineer's circuit cookbook: amplifiers for more information. Simulate this design by downloading
TINA-TI and the schematic.
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C1 3p
R2 10MEG
-2.5 V
R1 10MEG
-
Vout
+
+ TLV379
+
2.5 V
Vin *R3 5MEG
8 =F428
KQP 41 EJ
(cid:219)43 1LPEKJ=H BKN +JLQP $E=O %QNNAJP %=J?AHH=PEKJ
Figure 1-7. Inverting Amplifier With High Input Impedance
Simulate this design by downloading TINA-TI and the schematic.
C1 5p
R2 10k
-2.5 V
-2.5 V
-
R1 5k
-
+
+ TLV9052 Vout
+ + + TLV9052
2.5 V
Vin
2.5 V
4
8 =F 28
KQP 4 EJ
1
Figure 1-8. Two-Stage Inverting Amplifier With High Input Impedance
Simulate this design by downloading TINA-TI and the schematic.
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R2 1MEG
-2.5 V
R1 100k
-
R3 91k Vout
+
+
LM324LV
2.5 V
C1 1µ
+
Vin
4
8 = 1+ 2 8
KQP l 4 p EJ
1
4 =4 ||4 BKN %/44
3 1 2
1
B =
?QPKBB HKS 2Ł×% ×4
1 3
Figure 1-9. AC Coupled Non-Inverting Amplifier
See Analog engineer's circuit cookbook: amplifiers for more information. Simulate this design by downloading
TINA-TI and the schematic.
C2 1n
R2 10k
-2.5 V
R1 1k C1 10n
-
Vout
+
+ + TLV9062
Vin
2.5 V
*R3 910
8KQP =F@@8PEJ
1
B?=2Ł42%18EJ
1 1
BD=2Ł41%1= 2Ł42%2
B?’BD’BQJEPU C=EJ
(cid:219)43 1LPEKJ=H BKN +JLQP $E=O %QNNAJP %=J?AHH=PEKJ
Figure 1-10. Practical Differentiator
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic.
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S1 Open: Integrate
Closed: Reset
R3 100
C1 10n
-2.5 V
R1 10k
-
Vout
+
+ +
U1 LMV358A
Vin
2.5 V
*R2 10k
1 P2
8 = 8 @P
KQP F41%1–P1 EJ
1
B =
? 2Ł41%1
41=42
(cid:219)42 1LPEKJ=H BKN +JLQP $E=O %QNNAJP %=J?AHH=PEKJ
Figure 1-11. Integrator
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic.
R1 1k
-7.5 V
-
Vout
+
+
TLV9102
I_in
7.5 V
8 =+ 4
KQP EJ 1
Figure 1-12. Current to Voltage Converter (Transimpedance Amplifier)
See Analog engineer's circuit cookbook: amplifiers or [2] for more information. Simulate this design by
downloading TINA-TI and the schematic.
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+
Vin
-12 V
R1 10k
-
Vout
+
+
LMx58B/LM2904B
12 V
R2 3.83k
4
8 = 2 8
KQP 4 +4 EJ
1 2
Figure 1-13. Reference Voltage Generator
Simulate this design by downloading TINA-TI and the schematic.
R1 1k R2 10k
-2.5 V
- LM324LV
Vout
+
+
2.5 V
R3 200 C1 2n
+
Vin
C2 100n
4
% Q 1%
1 4 2
2
Figure 1-14. Neutralizing Input Capacitance to Optimize Response Time
Simulate this design by downloading TINA-TI and the schematic.
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1.8 V
D1 (cid:28)
-1.8 V
- TLV8542
Vout
+
+
R1 180k R_Load
1.8 V
-1.8 V
8 =1.88=>&EK@A 1BB
KQP
8 =F1.88=>&EK@A 1J
KQP
41 %KJPNKHO 5AJOEPEREPU PK .ECDP
Figure 1-15. Threshold Detector for Photodiodes
For more information on modeling photodiodes, see [8]. Simulate this design by downloading TINA-TI and the
schematic.
1.9V
3.3 V
TLV8542
+
+
VH
-
3.3 V
+
TLV8542
+
Vin +
VL
-
1.7V
+B 8 >1.98,PDAJ 8 =0 =J@ 8 =3.38
EJ * .
+B 1.98>8 >1.78,PDAJ 8 =3.38 =J@ 8 =3.38
EJ * .
+B 8 <1.78,PDAJ 8 =3.38 =J@ 8 =0
EJ * .
Figure 1-16. Double-Ended Limit Detector
Simulate this design by downloading TINA-TI and the schematic.
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