Op Amp Circuit Collection

Transcription

1 Op Amp Circuit Collection SECTION 1 BASIC CIRCUITS Inverting Amplifier Difference Amplifier V OUT eb R2 R1 V IN R IN e R1 TL H R1 a R2 V OUT e R3 a R4J R4 R1 V 2 b R2 R1 V 1 For R1 e R3 and R2 e R4 V OUT e R2 R1 (V 2 b V 1) R1UR2 e R3UR4 TL H For minimum offset error due to input bias current Non-Inverting Summing Amplifier R S e 1k for 1% accuracy TL H Fast Inverting Amplifier with High Input Impedance National Semiconductor Application Note 31 February 1978 Non-Inverting Amplifier V OUT e Inverting Summing Amplifier R1 a R2 V IN R1 TL H V OUT ebr4 V 1 R1 a V 2 R2 a V 3 R3J R5 e R1UR2UR3UR4 For minimum offset error due to input bias current Inverting Amplifier with High Input Impedance Source Impedance less than 100k gives less than 1% gain error TL H TL H TL H Non-Inverting AC Amplifier V OUT e R IN e R3 R3 e R1UR2 R1 a R2 V IN R1 TL H Op Amp Circuit Collection AN-31 C1995 National Semiconductor Corporation TL H 7057 RRD-B30M115 Printed in U S A

2 Practical Differentiator Integrator 1 f c e 2qR2C1 1 f h e 2qR1C1 e 1 2qR2C2 f c m f h m f unity gain TL H V OUT eb R1C1 1 t2 V IN dt t 1 1 f c e 2qR1C1 R1 e R2 For minimum offset error due to input bias current TL H Fast Integrator Current to Voltage Converter V OUT e l IN R1 For minimum error due to bias current R2 e R1 TL H TL H Circuit for Operating the LM101 without a Negative Supply Circuit for Generating the Second Positive Voltage TL H TL H

3 Neutralizing Input Capacitance to Optimize Response Time Double-Ended Limit Detector C N s R1 R2 C S TL H Integrator with Bias Current Compensation V OUT e 4 6V for V LT s V IN s V UT V OUT e 0V for V IN k V LT or V IN l V UT TL H Multiple Aperture Window Discriminator Voltage Comparator for Driving DTL or TTL Integrated Circuits Adjust for zero integrator drift Current drift typically 0 1 n A C over b55 C to125 C temperature range TL H Threshold Detector for Photodiodes TL H TL H TL H

4 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 RANGE e gv R2 R1J RANGE e gv R2 R1J GAIN e 1 a R5 R4 a R2 TL H TL H Offset Voltage Adjustment for Voltage Followers Offset Voltage Adjustment for Differential Amplifiers RANGE e gv R3 R1J TL H R2 e R3 a R4 RANGE e gv R5 R1 R4J R1 a R3J GAIN e R2 R1 TL H Offset Voltage Adjustment for Inverting Amplifiers Using 10 kx Source Resistance or Less R1 e 2000 R3UR4 R4UR3 s 10 kx RANGE e gv R3UR4 R1 J TL H

5 SECTION 2 SIGNAL GENERATION Low Frequency Sine Wave Generator with Quadrature Output TL H High Frequency Sine Wave Generator with Quadrature Output f o e 10 khz TL H

6 Free-Running Multivibrator Wein Bridge Sine Wave Oscillator Chosen for oscillation at 100 Hz TL H R1 e R2 C1 e C2 Eldema V 14 ma Bulb f e 2qR1 C1 TL H Function Generator TL H Pulse Width Modulator TL H

7 Bilateral Current Source Bilateral Current Source I OUT e R3 V IN R1 R5 R3 e R4 a R5 R1 e R2 I OUT e R3 V IN R1 R5 R3 e R4 a R5 R1 e R2 TL H TL H Wein Bridge Oscillator with FET Amplitude Stabilization R1 e R2 C1 e C2 1 f e 2qR1 C1 TL H

8 Low Power Supply for Integrated Circuit Testing V OUT e 1V kx TL H TL H Positive Voltage Reference Positive Voltage Reference TL H TL H

9 Negative Voltage Reference Negative Voltage Reference TL H TL H Precision Current Sink Precision Current Source I O e V IN R1 V IN t 0V TL H TL H SECTION 3 SIGNAL PROCESSING Differential-Input Instrumentation Amplifier R4 R2 e R5 R3 A V e R4 R2 TL H

10 Variable Gain Differential-Input Instrumentation Amplifier Gain adjust A V e 10 b4 R6 TL H Instrumentation Amplifier with g100 Volt Common Mode Range R1 e R5 e 10R2 R2 e R3 R3 e R4 R1 e R6 e 10R3 A V e R7 R6 Matching determines common mode rejection TL H

11 Instrumentation Amplifier with g10 Volt Common Mode Range R1 e R4 R2 e R5 R6 e R7 Matching Determines CMRR A V e R6 R2 1 a 2R1 R3 J TL H High Input Impedance Instrumentation Amplifier Matching determines CMRR May be deleted to maximize bandwidth R1 e R4 R2 e R3 A V e 1 a R1 R2 TL H Bridge Amplifier with Low Noise Compensation Reduces feed through of power supply noise by 20 db and makes supply bypassing unnecessary Trim for best common mode rejection Gain adjust TL H

12 Bridge Amplifier Precision Diode R1 e R2 R S1 R S2 V OUT e V a 1 b R1 R S1 J TL H TL H Precision Clamp Fast Half Wave Rectifier E REF must have a source impedance of less than 200X if D2 is used TL H TL H Precision AC to DC Converter Feedforward compensation can be used to make a fast full wave rectifier without a filter TL H Low Drift Peak Detector TL H

13 Absolute Value Amplifier with Polarity Detector V OUT eblv INl c R2 R1 R2 R4 a R3 e R1 R3 TL H Sample and Hold Polycarbonate-dielectric capacitor TL H Sample and Hold Worst case drift less than 2 5 mv sec Teflon Polyethylene or Polycarbonate Dielectric Capacitor 13 TL H

14 Low Drift Integrator Q1 and Q3 should not have internal gate-protection diodes TL H Worst case drift less than 500 mv sec over b55 C toa125 C Fast Summing Amplifier with Low Input Current 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 ms C5 e 6 c 10b8 R f TL H

15 Fast Integrator with Low Input Current TL H Adjustable Q Notch Filter 1 f O e 2qR1C1 e 60 Hz R1 e R2 e R3 C1 e C2 e C23 TL H

16 Easily Tuned Notch Filter Tuned Circuit 1 f O e 2q0R1R2C1C2 TL H R4 e R5 R1 e R3 R4 e R1 1 f O e 2qR40C1C2 TL H Two-Stage Tuned Circuit 1 f O e 2q0R1R2C1C2 TL H

17 Negative Capacitance Multiplier C e R2 R3 C1 I L e V OS a R2 I OS R3 R S e R3(R1 a R IN) R IN A VO TL H Variable Capacitance Multiplier C e 1 a R b R a J C 1 TL H Simulated Inductor Capacitance Multiplier C e R1 R3 C1 I L e V OS a I OS R1 R3 R S e R3 L t R1 R2 C1 R S e R2 R P e R1 TL H TL H

18 High Pass Active Filter Values are for 100 Hz cutoff Use metalized polycarbonate capacitors for good temperature stability TL H Low Pass Active Filter Values are for 10 khz cutoff Use silvered mica capacitors for good temperature stability TL H Nonlinear Operational Amplifier with Temperature Compensated Breakpoints TL H

19 Current Monitor Saturating Servo Preamplifier with Rate Feedback V OUT e R1 R3 R2 I L TL H TL H Power Booster TL H

20 Analog Multiplier R5 e R1 Vb 10 J V 1 t 0 V OUT e V 1 V 2 10 TL H Long Interval Timer Fast Zero Crossing Detector Low leakage b0 017 mf per second delay TL H Propagation delay approximately 200 ns DTL or TTL fanout of three Minimize stray capacitance Pin 8 TL H Amplifier for Piezoelectric Transducer Temperature Probe Set for 0V at 0 C Adjust for 100 mv C Low frequency cutoff e R1 C1 TL H TL H

21 Photodiode Amplifier Photodiode Amplifier V OUT e R1 I D V OUT e 10 V ma TL H Operating photodiode with less than 3 mv across it eliminates leakage currents TL H High Input Impedance AC Follower TL H Temperature Compensated Logarithmic Converter 1 kx(g1%) 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 na k I IN k 1mA Sensitivity is 1V per decade 21

22 Root Extractor 2N3728 matched pairs TL H

23 Multiplier Divider TL H Cube Generator TL H

24 AN-31 Op Amp Circuit Collection LIFE SUPPORT POLICY Fast Log Generator Anti-Log Generator 1 kx(g1%) at 25 C a3500 ppm C Available from Vishay Ultronix Grand Junction CO Q81 Series TL H kx(g1%) at 25 C a3500 ppm C Available from Vishay Ultronix Grand Junction CO Q81 Series TL H 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 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 National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd Japan Ltd 1111 West Bardin Road Fax (a49) th Floor Straight Block Tel Arlington TX cnjwge tevm2 nsc com Ocean Centre 5 Canton Rd Fax Tel 1(800) Deutsch Tel (a49) Tsimshatsui Kowloon Fax 1(800) English Tel (a49) Hong Kong Fran ais Tel (a49) Tel (852) Italiano Tel (a49) Fax (852) 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