TL/H/7057
Op Amp Circuit Collection AN-31
National Semiconductor
Application Note 31
February 1978
Op Amp Circuit Collection
SECTION 1ÐBASIC CIRCUITS
Inverting Amplifier
VOUT ebR2
R1 VIN
RIN eR1
TL/H/7057–1
Non-Inverting Amplifier
VOUT eR1 aR2
R1 VIN
TL/H/7057–2
Difference Amplifier
VOUT e#R1 aR2
R3 aR4 JR4
R1 V2bR2
R1 V1
For R1 eR3 and R2 eR4
VOUT eR2
R1 (V2bV1)
R1UR2 eR3UR4 TL/H/7057–3
For minimum offset error
due to input bias current
Inverting Summing Amplifier
VOUT eb
R4 #V1
R1 aV2
R2 aV3
R3 J
R5 eR1UR2UR3UR4
For minimum offset error
due to input bias current
TL/H/7057–4
Non-Inverting Summing Amplifier
*RSe1k
for 1% accuracy
TL/H/7057–5
Inverting Amplifier with High Input Impedance
*Source Impedance
less than 100k
gives less than 1%
gain error.
TL/H/7057–6
Fast Inverting Amplifier with High Input Impedance
TL/H/7057–7
Non-Inverting AC Amplifier
VOUT eR1 aR2
R1 VIN
RIN eR3
R3 eR1UR2
TL/H/7057–8
C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
Practical Differentiator
fce1
2qR2C1
fhe1
2qR1C1 e1
2qR2C2
fcmfhmfunity gain
TL/H/7057–9
Integrator
VOUT eb 1
R1C1 #t2
t1
VIN dt
fce1
2qR1C1
R1 eR2
For minimum offset error due
to input bias current TL/H/7057–10
Fast Integrator
TL/H/7057–11
Current to Voltage Converter
VOUT elIN R1
*For minimum error due to
bias current R2 eR1
TL/H/7057–12
Circuit for Operating the LM101
without a Negative Supply
TL/H/7057–13
Circuit for Generating the
Second Positive Voltage
TL/H/7057–14
2
Neutralizing Input Capacitance
to Optimize Response Time
CNsR1
R2 CS
TL/H/7057–15
Integrator with Bias Current Compensation
*Adjust for zero integrator drift.
Current drift typically 0.1, n/A§C
over b55§Cto125
§
C
temperature range.
TL/H/7057–16
Voltage Comparator for Driving
DTL or TTL Integrated Circuits
TL/H/7057–17
Threshold Detector for Photodiodes
TL/H/7057–18
Double-Ended Limit Detector
VOUT e4.6V for
VLT sVIN sVUT
VOUT e0V for
VIN kVLT or VIN lVUT
TL/H/7057–19
Multiple Aperture Window Discriminator
TL/H/7057–20
3
Offset Voltage Adjustment for Inverting Amplifiers
Using Any Type of Feedback Element
RANGE egV#R2
R1 J
TL/H/7057–21
Offset Voltage Adjustment for Non-Inverting Amplifiers
Using Any Type of Feedback Element
RANGE egV#R2
R1 J
GAIN e1aR5
R4 aR2
TL/H/7057–22
Offset Voltage Adjustment for Voltage Followers
RANGE egV#R3
R1 J
TL/H/7057–23
Offset Voltage Adjustment for Differential Amplifiers
R2 eR3 aR4
RANGE egV#R5
R4 J#R1
R1 aR3 J
GAIN eR2
R1 TL/H/7057–24
Offset Voltage Adjustment for Inverting
Amplifiers Using 10 kXSource Resistance or Less
R1 e2000 R3UR4
R4UR3 s10 kX
RANGE egV#R3UR4
R1 JTL/H/7057–25
4
SECTION 2 Ð SIGNAL GENERATION
Low Frequency Sine Wave Generator with Quadrature Output
TL/H/7057–26
High Frequency Sine Wave Generator with Quadrature Output
foe10 kHz
TL/H/7057–27
5
Free-Running Multivibrator
*Chosen for oscillation at 100 Hz
TL/H/7057–28
Wein Bridge Sine Wave Oscillator
R1 eR2
C1 eC2 *Eldema 1869
fe1
2qR1 C1
10V, 14 mA Bulb
TL/H/7057–29
Function Generator
TL/H/7057–30
Pulse Width Modulator
TL/H/7057–31
6
Bilateral Current Source
IOUT eR3 VIN
R1 R5
R3 eR4 aR5
R1 eR2 TL/H/7057–32
Bilateral Current Source
IOUT eR3 VIN
R1 R5
R3 eR4 aR5
R1 eR2
TL/H/7057–33
Wein Bridge Oscillator with FET Amplitude Stabilization
R1 eR2
C1 eC2
fe1
2qR1 C1 TL/H/7057–34
7
Low Power Supply for Integrated Circuit Testing
TL/H/7057–35
*VOUT e1V/kX
TL/H/7057–91
Positive Voltage Reference
TL/H/7057–36
Positive Voltage Reference
TL/H/7057–37
8
Negative Voltage Reference
TL/H/7057–38
Negative Voltage Reference
TL/H/7057–39
Precision Current Sink
IOeVIN
R1
VIN t0V
TL/H/7057–40
Precision Current Source
TL/H/7057–41
SECTION 3 Ð SIGNAL PROCESSING
Differential-Input Instrumentation Amplifier
R4
R2 eR5
R3
AVeR4
R2
TL/H/7057–42
9
Variable Gain, Differential-Input Instrumentation Amplifier
*Gain adjust
AVe10b4R6
TL/H/7057–43
Instrumentation Amplifier with g100 Volt Common Mode Range
R3 eR4
R1 eR6 e10R3
AVeR7
R6
*²Matching determines common
R1 eR5 e10R2
mode rejection.
R2 eR3
TL/H/7057–44
10
Instrumentation Amplifier with g10 Volt Common Mode Range
R1 eR4
R2 eR5
R6 eR7
²*Matching Determines CMRR
AVeR6
R2 #1a2R1
R3 J
TL/H/7057–45
High Input Impedance Instrumentation Amplifier
R1 eR4; R2 eR3
AVe1aR1
R2
*²Matching determines CMRR
³May be deleted to maximize bandwidth TL/H/7057–46
Bridge Amplifier with Low Noise Compensation
*Reduces feed through of
power supply noise by 20 dB
and makes supply bypassing
unnecessary.
²Trim for best common
mode rejection
³Gain adjust
TL/H/7057–47
11
Bridge Amplifier
R1
RS1
eR2
RS2
VOUT eVa#1bR1
RS1 J
TL/H/7057–48
Precision Diode
TL/H/7057–49
Precision Clamp
*EREF must have a source im-
pedance of less than 200Xif
D2 is used.
TL/H/7057–50
Fast Half Wave Rectifier
TL/H/7057–51
Precision AC to DC Converter
*Feedforward compensation can be used to make a fast full wave rectifier without a filter. TL/H/7057–52
Low Drift Peak Detector
TL/H/7057–53
12
Absolute Value Amplifier with Polarity Detector
VOUT eb
l
V
IN
l
cR2
R1
R2
R1 eR4 aR3
R3
TL/H/7057–54
Sample and Hold
*Polycarbonate-dielectric capacitor
TL/H/7057–55
Sample and Hold
*Worst case drift less than 2.5 mV/sec
²Teflon, Polyethylene or Polycarbonate
Dielectric Capacitor
TL/H/7057–56
13
Low Drift Integrator
TL/H/7057–57
*Q1 and Q3 should not have internal gate-protection diodes. Worst case drift less than 500 mV/sec over b55§Ctoa
125§C.
Fast²Summing Amplifier with Low Input Current
TL/H/7057–58
*In addition to increasing speed, the LM101A raises high and low frequency
gain, increases output drive capability and eliminates thermal feedback.
²Power Bandwidth: 250 kHz
Small Signal Bandwidth: 3.5 MHz
Slew Rate: 10V/ms
³C5 e6c10b8
Rf
14
Fast Integrator with Low Input Current
TL/H/7057–59
Adjustable Q Notch Filter
fOe1
2qR1C1
e60 Hz
R1 eR2 eR3
C1 eC2 eC23 TL/H/7057–60
15
Easily Tuned Notch Filter
R4 eR5
R1 eR3
R4 e(/2 R1
fOe1
2qR40C1C2 TL/H/7057–61
Tuned Circuit
fOe1
2q0R1R2C1C2
TL/H/7057–62
Two-Stage Tuned Circuit
fOe1
2q0R1R2C1C2
TL/H/7057–63
16
Negative Capacitance Multiplier
CeR2
R3 C1
ILeVOS aR2 IOS
R3
RSeR3(R1 aRIN)
RIN AVO
TL/H/7057–65
Variable Capacitance Multiplier
Ce#1aRb
RaJC1
TL/H/7057–66
Simulated Inductor
LtR1 R2 C1
RSeR2
RPeR1 TL/H/7057–67
Capacitance Multiplier
CeR1
R3 C1
ILeVOS aIOS R1
R3
RSeR3
TL/H/7057–68
17
High Pass Active Filter
TL/H/7057–71
*Values are for 100 Hz cutoff. Use metalized polycarbonate capacitors for good temperature stability.
Low Pass Active Filter
TL/H/7057–72
*Values are for 10 kHz cutoff. Use silvered mica capacitors for good temperature stability.
Nonlinear Operational Amplifier with Temperature Compensated Breakpoints
TL/H/7057–73
18
Current Monitor
VOUT eR1 R3
R2 IL
TL/H/7057–74
Saturating Servo Preamplifier with
Rate Feedback
TL/H/7057–75
Power Booster
TL/H/7057–76
19
Analog Multiplier
R5 eR1 #Vb
10 J
V1t0
VOUT eV1V2
10
TL/H/7057–77
Long Interval Timer
*Low leakage b0.017 mF per second delay
TL/H/7057–78
Fast Zero Crossing Detector
TL/H/7057–79
Propagation delay approximately 200 ns
²DTL or TTL fanout of three.
Minimize stray capacitance
Pin 8
Amplifier for Piezoelectric Transducer
Low frequency cutoff eR1 C1
TL/H/7057–80
Temperature Probe
*Set for 0V at 0§C
²Adjust for 100 mV/§C
TL/H/7057–81
20
Photodiode Amplifier
VOUT eR1 ID
TL/H/7057–82
Photodiode Amplifier
VOUT e10 V/mA
TL/H/7057–83
*Operating photodiode with less than 3 mV
across it eliminates leakage currents.
High Input Impedance AC Follower
TL/H/7057–84
Temperature Compensated Logarithmic Converter
²1kX(
g
1%) at 25§C, a3500 ppm/§C.
Available from Vishay Ultronix,
Grand Junction, CO, Q81 Series.
*Determines current for zero
crossing on output: 10 mA
as shown.
TL/H/7057–85
10 nA kIIN k1mA
Sensitivity is 1V per decade
21
Root Extractor
*²2N3728 matched pairs TL/H/7057–86
22
Multiplier/Divider
TL/H/7057–87
Cube Generator
TL/H/7057–88
23
AN-31 Op Amp Circuit Collection
Fast Log Generator
²1kX(
g
1%) at 25§C, a3500 ppm/§C.
Available from Vishay Ultronix,
Grand Junction, CO, Q81 Series.
TL/H/7057–89
Anti-Log Generator
²1kX(
g
1%) at 25§C, a3500 ppm/§C.
Available from Vishay Ultronix,
Grand Junction, CO, Q81 Series.
TL/H/7057–90
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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