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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

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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

13

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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

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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

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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

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Multiplier Divider

TL H 705787

Cube Generator

TL H 705788

23

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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

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