Circuit Collection 1
National Semiconductor
Application Note 31
September 2002
Note: National Semiconductor recommends replacing 2N2920 and 2N3728 matched pairs with LM394 in all application
circuits.
Section 1—Basic Circuits
Inverting Amplifier
Non-Inverting Amplifier
Op Amp Circuit Collection
Op Amp Circuit Collection
00705702
00705701
Difference Amplifier
Inverting Summing Amplifier
00705703
00705704
R5 = R1//R2//R3//R4
For minimum offset error due to input bias current
For minimum offset error due to input bias current
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© 2002 National Semiconductor Corporation
AN007057
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Section 1—Basic Circuits
(Continued)
Non-Inverting Summing Amplifier
Inverting Amplifier with High Input Impedance
00705705
*RS = 1k for 1% accuracy
00705706
*Source Impedance less than 100k gives less than 1% gain error.
Fast Inverting Amplifier with High Input Impedance
Non-Inverting AC Amplifier
00705708
00705707
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Section 1—Basic Circuits
(Continued)
Practical Differentiator
Integrator
00705709
00705710
For minimum offset error due to input bias current
Fast Integrator
Current to Voltage Converter
00705712
VOUT = lIN R1
*For minimum error due to bias current R2 = R1
00705711
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Section 1—Basic Circuits
(Continued)
Circuit for Operating the LM101
without a Negative Supply
Circuit for Generating the
Second Positive Voltage
00705714
00705713
Neutralizing Input Capacitance
to Optimize Response Time
Voltage Comparator for Driving
DTL or TTL Integrated Circuits
00705717
Threshold Detector for Photodiodes
00705715
Integrator with Bias Current Compensation
00705718
00705716
*Adjust for zero integrator drift.
Current drift typically 0.1 n/A˚C over −55˚C to 125˚C temperature range.
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Section 1—Basic Circuits
(Continued)
Double-Ended Limit Detector
00705719
VOUT = 4.6V for VLT ≤ VIN ≤ VUT
VOUT = 0V for VIN < VLT or VIN > VUT
Multiple Aperture Window Discriminator
00705720
5
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Section 1—Basic Circuits
(Continued)
Offset Voltage Adjustment for Inverting Amplifiers Using
Any Type of Feedback Element
Offset Voltage Adjustment for Non-Inverting Amplifiers
Using Any Type of Feedback Element
00705722
00705721
Offset Voltage Adjustment for Voltage Followers
Offset Voltage Adjustment for Differential Amplifiers
00705723
00705724
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Section 1—Basic Circuits
(Continued)
Offset Voltage Adjustment for Inverting Amplifiers Using 10 kΩ Source Resistance or Less
00705725
Section 2 — Signal Generation
Low Frequency Sine Wave Generator with Quadrature Output
00705726
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Section 2 — Signal Generation
(Continued)
High Frequency Sine Wave Generator with Quadrature Output
00705727
Free-Running Multivibrator
Wein Bridge Sine Wave Oscillator
00705728
*Chosen for oscillation at 100 Hz
00705729
*Eldema 1869 10V, 14 mA Bulb
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Section 2 — Signal Generation
(Continued)
Function Generator
00705730
Pulse Width Modulator
00705731
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Section 2 — Signal Generation
(Continued)
Bilateral Current Source
Bilateral Current Source
00705732
00705733
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Section 2 — Signal Generation
(Continued)
Wein Bridge Oscillator with FET Amplitude Stabilization
00705734
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Section 2 — Signal Generation
(Continued)
Low Power Supply for Integrated Circuit Testing
00705791
*VOUT = 1V/kΩ
00705735
Positive Voltage Reference
Positive Voltage Reference
00705737
00705736
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Section 2 — Signal Generation
(Continued)
Negative Voltage Reference
Negative Voltage Reference
00705739
00705738
Precision Current Sink
Precision Current Source
00705741
00705740
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Section 3 — Signal Processing
Differential-Input Instrumentation Amplifier
00705742
Variable Gain, Differential-Input Instrumentation Amplifier
00705743
*Gain adjust
AV = 10−4 R6
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Section 3 — Signal Processing
(Continued)
Instrumentation Amplifier with ± 100 Volt Common Mode Range
00705744
†Matching determines common mode rejection.
15
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Section 3 — Signal Processing
(Continued)
Instrumentation Amplifier with ± 10 Volt Common Mode Range
00705745
High Input Impedance Instrumentation Amplifier
00705746
* †Matching Determines CMRR
‡ May be deleted to maximize bandwidth
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Section 3 — Signal Processing
(Continued)
Bridge Amplifier with Low Noise Compensation
00705747
*Reduces feed through of power supply noise by 20 dB and makes supply bypassing unnecessary.
†Trim for best common mode rejection
‡ Gain adjust
Bridge Amplifier
Precision Diode
00705749
00705748
Precision Clamp
Fast Half Wave Rectifier
00705750
*EREF must have a source impedance of less than 200Ω if D2 is used.
00705751
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Section 3 — Signal Processing
(Continued)
Precision AC to DC Converter
00705752
*Feedforward compensation can be used to make a fast full wave rectifier without a filter.
Low Drift Peak Detector
00705753
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Section 3 — Signal Processing
(Continued)
Absolute Value Amplifier with Polarity Detector
00705754
Sample and Hold
00705755
*Polycarbonate-dielectric capacitor
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Section 3 — Signal Processing
(Continued)
Sample and Hold
00705756
*Worst case drift less than 2.5 mV/sec
†Teflon, Polyethylene or Polycarbonate Dielectric Capacitor
Low Drift Integrator
00705757
*Q1 and Q3 should not have internal gate-protection diodes.
Worst case drift less than 500 µV/sec over −55˚C to +125˚C.
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Section 3 — Signal Processing
(Continued)
Fast† Summing Amplifier with Low Input Current
00705758
*In addition to increasing speed, the LM101A raises high and low frequency gain, increases output drive capability and eliminates thermal feedback.
†Power Bandwidth: 250 kHz
Small Signal Bandwidth: 3.5 MHz
Slew Rate: 10V/µs
Fast Integrator with Low Input Current
00705759
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Section 3 — Signal Processing
(Continued)
Adjustable Q Notch Filter
00705760
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Section 3 — Signal Processing
(Continued)
Easily Tuned Notch Filter
Tuned Circuit
00705762
00705761
Two-Stage Tuned Circuit
00705763
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Section 3 — Signal Processing
(Continued)
Negative Capacitance Multiplier
00705765
Variable Capacitance Multiplier
00705766
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Section 3 — Signal Processing
(Continued)
Simulated Inductor
Capacitance Multiplier
00705767
L ≥ R1 R2 C1
RS = R2
00705768
RP = R1
High Pass Active Filter
00705771
*Values are for 100 Hz cutoff. Use metalized polycarbonate capacitors for good temperature stability.
Low Pass Active Filter
00705772
*Values are for 10 kHz cutoff. Use silvered mica capacitors for good temperature stability.
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Section 3 — Signal Processing
(Continued)
Nonlinear Operational Amplifier with Temperature Compensated Breakpoints
00705773
Current Monitor
00705774
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Section 3 — Signal Processing
(Continued)
Saturating Servo Preamplifier with Rate Feedback
00705775
Power Booster
00705776
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Section 3 — Signal Processing
(Continued)
Analog Multiplier
00705777
Long Interval Timer
Fast Zero Crossing Detector
00705779
Propagation delay approximately 200 ns
00705778
*Low leakage −0.017 µF per second delay
†DTL or TTL fanout of three.
Minimize stray capacitance
Pin 8
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Section 3 — Signal Processing
(Continued)
Amplifier for Piezoelectric Transducer
Temperature Probe
00705781
*Set for 0V at 0˚C
†Adjust for 100 mV/˚C
00705780
Low frequency cutoff = R1 C1
Photodiode Amplifier
Photodiode Amplifier
00705782
VOUT = R1 ID
00705783
VOUT = 10 V/µA
*Operating photodiode with less than 3 mV across it eliminates leakage
currents.
High Input Impedance AC Follower
00705784
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Section 3 — Signal Processing
(Continued)
Temperature Compensated Logarithmic Converter
00705785
10 nA < IIN < 1 mA
Sensitivity is 1V per decade
†1 kΩ ( ± 1%) at 25˚C, +3500 ppm/˚C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
*Determines current for zero crossing on output: 10 µA as shown.
Root Extractor
00705786
*†2N3728 matched pairs
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Section 3 — Signal Processing
(Continued)
Multiplier/Divider
00705787
Cube Generator
00705788
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Section 3 — Signal Processing
(Continued)
Fast Log Generator
00705789
†1 kΩ ( ± 1%) at 25˚C, +3500 ppm/˚C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
Anti-Log Generator
00705790
†1 kΩ ( ± 1%) at 25˚C, +3500 ppm/˚C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
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Op Amp Circuit Collection
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
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Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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National Semiconductor
Corporation
Americas
Email: [email protected]
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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