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TL H 7057
O p A m p C i r c u i t C o l l e c t i o n
A N- 3 1
National SemiconductorApplication Note 31February 1978
Op Amp Circuit Collection
SECTION 1 BASIC CIRCUITSInverting Amplifier
VOUT e bR2R1
VIN
RIN e R1
TL H 70571
Non-Inverting Amplifier
VOUT eR1 a R2
R1VIN
TL H 70572
Difference Amplifier
VOUT eR1 a R2
R3 a R4 JR4
R1V2 b
R2
R1V1
For R1 e R3 and R2 e R4
VOUT eR2R1
(V2 b V1)
R1 U R2 e R3 U R4 TL H 70573
For minimum offset errordue to input bias current
Inverting Summing Amplifier
VOUT e b R4 V1R1a V2R2
a V3R3 JR5 e R1 U R2 U R3 U R4
For minimum offset errordue to input bias current
TL H 70574
Non-Inverting Summing Amplifier
RS e 1kfor 1% accuracy
TL H 70575
Inverting Amplifier with High Input Impedance
Source Impedanceless than 100kgives less than 1%gain error
TL H 70576Fast Inverting Amplifier with High Input Impedance
TL H 70577
Non-Inverting AC Amplifier
VOUT eR1 a R2
R1VIN
RIN e R3
R3 e R1 U R2TL H 70578
C 1995 National Semiconductor Corporation RRD-B30M115 Printed in U S A
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Practical Differentiator
fc e1
2q R2C1
fh e1
2q R1C1e
12q R2C2
fc m fh m funity gainTL H 70579
Integrator
VOUT e b1
R1C1
t2
t1VIN dt
fc e1
2q R1C1
R1 e R2
For minimum offset error dueto input bias current TL H 705710
Fast Integrator
TL H 705711
Current to Voltage Converter
VOUT e lIN R1
For minimum error due tobias current R2 e R1
TL H 705712
Circuit for Operating the LM101without a Negative Supply
TL H 705713
Circuit for Generating theSecond Positive Voltage
TL H 705714
2
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Neutralizing Input Capacitanceto Optimize Response Time
CN sR1R2
CS
TL H 705715
Integrator with Bias Current Compensation
Adjust for zero integrator drift
Current drift typically 0 1 n A Cover b 55 C to 125 Ctemperature range
TL H 705716
Voltage Comparator for DrivingDTL or TTL Integrated Circuits
TL H 705717
Threshold Detector for Photodiodes
TL H 705718
Double-Ended Limit Detector
VOUT e 4 6V for
VLT s VIN s VUT
VOUT e 0V for
VIN k VLT or VIN l VUTTL H 705719
Multiple Aperture Window Discriminator
TL H 705720
3
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Offset Voltage Adjustment for Inverting AmplifiersUsing Any Type of Feedback Element
RANGE e g VR2R1 J
TL H 705721
Offset Voltage Adjustment for Non-Inverting AmplifiersUsing Any Type of Feedback Element
RANGE e g VR2R1 J
GAIN e 1 aR5
R4 a R2
TL H 705722
Offset Voltage Adjustment for Voltage Followers
RANGE e g VR3R1 J
TL H 705723
Offset Voltage Adjustment for Differential Amplifiers
R2 e R3 a R4
RANGE e g VR5R4 J R1R1 a R3 J
GAIN eR2R1 TL H 705724
Offset Voltage Adjustment for InvertingAmplifiers Using 10 k X Source Resistance or Less
R1 e 2000 R3 U R4
R4 U R3 s 10 k X
RANGE e g VR3 U R4
R1 J TL H 705725
4
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SECTION 2 SIGNAL GENERATION
Low Frequency Sine Wave Generator with Quadrature Output
TL H 705726
High Frequency Sine Wave Generator with Quadrature Output
fo e 10 kHz
TL H 705727
5
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Free-Running Multivibrator
Chosen for oscillation at 100 Hz
TL H 705728
Wein Bridge Sine Wave Oscillator
R1 e R2
C1 e C2 Eldema 1869
f e1
2q R1 C1
10V 14 mA Bulb
TL H 705729
Function Generator
TL H 705730
Pulse Width Modulator
TL H 705731
6
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Bilateral Current Source
IOUT eR3 V INR1 R5
R3 e R4 a R5
R1 e R2 TL H 705732
Bilateral Current Source
IOUT eR3 V INR1 R5
R3 e R4 a R5
R1 e R2
TL H 705733
Wein Bridge Oscillator with FET Amplitude Stabilization
R1 e R2
C1 e C2
f e1
2q R1 C1 TL H 705734
7
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Low Power Supply for Integrated Circuit Testing
TL H 705735
VOUT e 1V kX
TL H 705791
Positive Voltage Reference
TL H 705736
Positive Voltage Reference
TL H 705737
8
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Negative Voltage Reference
TL H 705738
Negative Voltage Reference
TL H 705739
Precision Current Sink
IO eVINR1
VIN t 0V
TL H 705740
Precision Current Source
TL H 705741
SECTION 3 SIGNAL PROCESSINGDifferential-Input Instrumentation Amplifier
R4R2
eR5R3
AV e R4R2
TL H 705742
9
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Variable Gain Differential-Input Instrumentation Amplifier
Gain adjust
AV e 10 b 4 R6
TL H 705743
Instrumentation Amplifier with g 100 Volt Common Mode Range
R3 e R4
R1 e R6 e 10R3
AV eR7R6
Matching determines commonR1 e R5 e 10R2mode rejectionR2 e R3
TL H 705744
10
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Instrumentation Amplifier with g 10 Volt Common Mode Range
R1 e R4
R2 e R5
R6 e R7
Matching Determines CMRR
AV eR6R2
1 a2R1R3 J
TL H 705745
High Input Impedance Instrumentation Amplifier
R1 e R4 R2 e R3
AV e 1 aR1R2Matching determines CMRR
May be deleted to maximize bandwidth TL H 705746
Bridge Amplifier with Low Noise Compensation
Reduces feed through ofpower supply noise by 20 dBand makes supply bypassingunnecessary
Trim for best commonmode rejection
Gain adjust
TL H 705747
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Bridge Amplifier
R1RS1
eR2
RS2
VOUT e Va 1 bR1
RS1 JTL H 705748
Precision Diode
TL H 705749
Precision Clamp
EREF
must have a source im-pedance of less than 200 X ifD2 is used
TL H 705750
Fast Half Wave Rectifier
TL H 705751
Precision AC to DC Converter
Feedforward compensation can be used to make a fast full wave rectifier without a filter TL H 705752
Low Drift Peak Detector
TL H 705753
12
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Absolute Value Amplifier with Polarity Detector
VOUT e b lVINl cR2R1
R2R1
e R4a R3R3
TL H 705754
Sample and Hold
Polycarbonate-dielectric capacitor
TL H 705755
Sample and Hold
Worst case drift less than 2 5 mV sec
Teflon Polyethylene or PolycarbonateDielectric Capacitor
TL H 705756
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Low Drift Integrator
TL H 705757Q1 and Q3 should not have internal gate-protection diodes Worst case drift less than 500 mV sec over b 55 C to a 125 C
Fast Summing Amplifier with Low Input Current
TL H 705758In addition to increasing speed the LM101A raises high and low frequencygain increases output drive capability and eliminates thermal feedback
Power Bandwidth 250 kHzSmall Signal Bandwidth 3 5 MHzSlew Rate 10V ms
C5 e6 c 10 b 8
Rf
14
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Fast Integrator with Low Input Current
TL H 705759
Adjustable Q Notch Filter
fO e1
2q R1C1e 60 Hz
R1 e R2 e R3
C1 e C2 e C23 TL H 705760
15
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Easily Tuned Notch Filter
R4 e R5R1 e R3R4 e R1
fO e1
2q R4 0C1C2TL H 705761
Tuned Circuit
fO e1
2q 0R1R2C1C2
TL H 705762
Two-Stage Tuned Circuit
fO e1
2q 0R1R2C1C2
TL H 705763
16
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Negative Capacitance Multiplier
C eR2R3
C1
IL eVOS a R2 I OS
R3
RS eR3(R1 a RIN)
RIN AVO
TL H 705765
Variable Capacitance Multiplier
C e 1 aRbRa JC1
TL H 705766
Simulated Inductor
L t R1 R2 C1RS e R2RP e R1 TL H 705767
Capacitance Multiplier
C e R1R3
C1
IL eVOS a IOS R1
R3
RS e R3
TL H 705768
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High Pass Active Filter
TL H 705771
Values are for 100 Hz cutoff Use metalized polycarbonate capacitors for good temperature stability
Low Pass Active Filter
TL H 705772
Values are for 10 kHz cutoff Use silvered mica capacitors for good temperature stability
Nonlinear Operational Amplifier with Temperature Compensated Breakpoints
TL H 705773
18
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Current Monitor
VOUT eR1 R3
R2IL
TL H 705774
Saturating Servo Preamplifier withRate Feedback
TL H 705775
Power Booster
TL H 705776
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Analog Multiplier
R5 e R1Vb
10 JV1 t 0
VOUT eV1 V2
10
TL H 705777
Long Interval Timer
Low leakage b 0 017 mF per second delay
TL H 705778
Fast Zero Crossing Detector
TL H 705779
Propagation delay approximately 200 nsDTL or TTL fanout of three
Minimize stray capacitancePin 8
Amplifier for Piezoelectric Transducer
Low frequency cutoff e R1 C1
TL H 705780
Temperature Probe
Set for 0V at 0 CAdjust for 100 mV C
TL H 705781
20
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Photodiode Amplifier
VOUT e R1 I D
TL H 705782
Photodiode Amplifier
VOUT e 10 V mA
TL H 705783
Operating photodiode with less than 3 mVacross it eliminates leakage currents
High Input Impedance AC Follower
TL H 705784
Temperature Compensated Logarithmic Converter
1 k X (g 1%) at 25 C a 3500 ppm CAvailable from Vishay UltronixGrand Junction CO Q81 Series
Determines current for zerocrossing on output 10 mAas shown
TL H 705785
10 nA k IIN k 1 mASensitivity is 1V per decade
21
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R o o t E x t r a c t o r
2 N 3 7 2 8 m a t c h e d p a i r s
T L H 7 0 5 7
8 6
22
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Multiplier Divider
TL H 705787
Cube Generator
TL H 705788
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A N - 3
1
O p A m p C i r c u i t C o l l e c t i o n
Fast Log Generator
1 k X (g 1%) at 25 C a 3500 ppm CAvailable from Vishay UltronixGrand Junction CO Q81 Series
TL H 705789
Anti-Log Generator
1 k X (g 1%) at 25 C a 3500 ppm CAvailable from Vishay UltronixGrand Junction CO Q81 Series
TL H 705790
LIFE SUPPORT POLICY
NATIONALS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORTDEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONALSEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or 2 A critical component is any component of a lifesystems which (a) are intended for surgical implant support device or system whose failure to perform caninto the body or (b) support or sustain life and whose be reasonably expected to cause the failure of the lifefailure to perform when properly used in accordance support device or system or to affect its safety orwith instructions for use provided in the labeling can effectivenessbe reasonably expected to result in a significant injuryto the user
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