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Amplifier Circuits:  Operational
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Last Updated: June 02, 2021 01:44 PM

 
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One Op Amp achieves double-hysteresis-transfer characteristic -  09/27/07  EDN-Design Ideas An op amp combines with strategically placed zener diodes to yield a process-control circuit that has positive- and negative-going hysteresis bands Design by Herminio Martínez, Encarna García, and Juan Gámiz, Technical University of Catalonia, Barcelona, Spain

Op Amp as a Set/Reset Flip-Flop -  05/24/12  EDN-Design Ideas Eliminate a flip-flop package by using a spare op amp for an SR latch function.  You can make a set/reset flip-flop from two NAND or NOR gates or use readily available set/reset flip-flop ICs, such as the 74HC279 quad-set/reset latch.  The drawback of these methods is that they require a large amount of space to form the flip-flop.  Even if you need only one flip-flop, you must use a large IC package with this approach.  However, you can use a spare rail-to-rail op amp to perform the needed latch function (Figure 1). Design by Aruna Rubasinghe

Op Amp Bandwidth -  (spice design) __ Designed by Rick 

Op Amp Based FM Transmitter -  An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier. __ Designed by Kamran Ahmed

Op Amp can source or sink current -  03/02/06 EDN-Design Ideas   Bipolar current source beats familiar Howland-current pump Design by Alfredo H Saab and Steve Logan, Maxim Integrated Products Inc,  Sunnyvale, CA; Edited by Brad Thompson and Fran GranvilleMarch 2, 2006

Op Amp Comparator & Reference IC Provides Miscropower Monitoring Capability -  Design Notes 190__ Linear Technology/Analog Devices

Op Amp Comparator with Hysteresis with SPICE simulation -  The challenge sounds simple enough, take a 60 Hz (or 50 Hz) sinewave from the AC power line and convert it to a square wave.  This signal will serve as a clock to drive counters for a 24 hour time clock.  So you hook up an op amp as a comparator to do the job.  But your surprised to see the clock running too fast! With oscilloscope in hand you discover the AC line is noisy! And to your horror, you see glitches (spice design)



Op Amp Comparator & Reference IC Provides Micropower Monitoring Capability Design Note 190 -  DN190 Design Notes __ Linear Technology/Analog Devices

Op Amp Comparator & Reference IC Provides Miscropower Monitoring Capability -  Design Notes 190 __ Linear Technology/Analog Devices

Op Amp Comparator with Hysteresis with SPICE simulation -  The challenge sounds simple enough, take a 60 Hz (or 50 Hz) sinewave from the AC power line and convert it to a square wave.  This signal will serve as a clock to drive counters for a 24 hour time clock.  So you hook up an op amp as a comparator to do the job.  But your surprised to see the clock running too fast! With oscilloscope in hand you discover the AC line is noisy! And to your horror, you see glitches (spice design)

Op Amp Differentiator-Open Loop Analysis -  (spice design) __ Designed by Rick 

Op Amp Feedback Analysis -  (spice design) __ Designed by Rick 

Op Amp Improves Power Supply's Regulation -  6-Jun-96 EDN-Design Ideas A typical power supply has a voltage-regulation specification of 2 to 3% for all conditions, including initial setting, line, load, and temperature.  You can improve regulation if the power-supply has remote-sensing capability, however Design by Jimmie D Felps, Hewlett-Packard, Colorado Springs, CO

Op Amp increases potentiometer's resolution -  06/05/00 EDN-Design Ideas A key parameter of digitally controlled potentiometers(DCPs] is the number of taps(n] programmable positions of the wiper.  This parameter establishes the resolution in  programmable-voltage and -current applications.  A number of circuitPDF has many circuits, please scroll to find this one Design by Chuck Wojslaw, Xicor Inc, Milpitas, CA, and P Gareth Lloyd, Elab Ltd, Stoke-on-Trent, UK

Op Amp Input Voff & Ibias -  (spice design) __ Designed by Rick 

Op Amp Limiter -  (spice design) __ Designed by Rick 

Op Amp linearizes attenuator control response -  07/25/02 EDN-Design Ideas Professional-audio equipment commonly uses Analog Devices'(www.analog.com] high-performance, quad-voltage-controlled SSM2164 attenuator.  The control response is -30 dB/V, with 0V producing unity gain.  Attenuation increases as the applied control voltage increases in the positive direction.  The circuit in Figure 1 extends the range of applications for this versatile chip by providing a simple Design by Mike Irwin, Shawville, PQ, Canada

Op Amp linearizes response of FET VCA -  09/05/02 EDN-Design Ideas   FETs find common use in VCAs(voltage-controlled amplifiers]and attenuators, in which the FET serves as a variable resistance.  A control voltage applied to the gate sets the channel resistance and overall circuit gain Design by Mike Irwin, Shawville, PQ, Canada

Op Amp Macro-Models -  (spice design) __ Designed by Rick 

Op Amp makes precise 9V-battery splitter -  07/17/97 EDN-Design Ideas Alkaline 9V batteries are ideal for many portable, handheld applications, this circuit generates a bipolar supply of5V and ­2.3 to ­4V using a precision5V reference and one op amp as a supply splitter Design by Steve Hageman, Hewlett-Packard, Santa Rosa, CA

Op Amp PID Controller -  We've all heard about the wonders of the PID controller, bringing a system's output, temperature, velocity, light, to its desired set point quickly and accurately.  But now, your boss says okay, design one for us.  Although there's a number of ways to do it, the circuit above nicely separates the three terms (spice design)

Op Amp Provides On-The-Fly Adjustable Current Limit -  DN298 Design Notes __ Linear Technology/Analog Devices

Op Amp Radio -  Here is a simple radio that is easy to build and inexpensive.  In fact, you probobly have all the parts you need in your junk box.  You'll be suprised at the great reception with this little set. __ Designed by Aaron Cake

Op Amp Triangle-Wave Generator & SPICE simulation files -  This signal generator gives you two waveforms for the price of one: a triangle-wave and a square-wave. What is the central component of this circuit? The integrator capacitor CI

Op Amps Make Automatic-Oring Power Selector -  08/11/11  EDN-Design Ideas Replace diodes with FETs to reduce power loss.  Many systems must select among two or more low-voltage dc-input sources, such as an ac adapter, a USB (Universal Serial Bus) port, or an onboard battery, for example.  You can implement this selection using manual switches, but automatic switching is preferable.  You usually want to use the highest-available input voltage to power your system.  You can accomplish this task using a Schottky-diode ORing scheme (Figure 1).  Unfortunately, the forward-voltage drop of a Schottky diode ranges from 300 to 600 mV.  This voltage wastes power, creates heat, and decreases the voltage available to your system. Design by Bob Zwicker, Analog Devices, Fort Collins, CO

Op Amps make JFETs repeatable -  05/24/01 EDN-Design Ideas Because they use practically no bias current(a useful feature in itself), JFETs also have practically no current noise.  This feature means that you can use JFETs in very-high-resistance circuits and obtain good noisePDF has many circuits, scroll for this one Design by Glen Brisebois, Linear Technology Corp, Milpitas, CA

Op-amp Astable Timer -  An astable timing circuit made from the ubiquitous 741 op-amp. __ Designed by Andy Collison

 


Operational Amplifiers:  #'s - A        B - C      D - K       L - N       O       P - S        T - Z 


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