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Amplifier Circuits:  Operational
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Amplifier -- Main Page

Last Updated: November 30, 2017 07:38 AM

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DAC & Op Amp Generate Variable Negative Control Voltage -  App Note/ 107) 4 / Feb-05 __ Maxim Integrated

DAC & Op Amp Provide Variable Control Voltage -  12/06/01 EDN-Design Ideas Early DACs contained standard R-2R ladder networks, and produced a negative output voltage.  These early DACs, such as  MAX7837/7847 and  MAX523, require both positive and negative supply rails to accommodate ir negative output.  With  transition to single-supply ICs, however, many modern DACs operate with a single supply rail and an inverted R-2R ladder network __ Circuit Design by Chad Olson

DAC Reference Inverter & I-to-V Converter -  LT6011 dual op amp performs two functionsinverting a positive ref voltage to a negative ref voltage to allow bipolar output polarities and performing the current to voltage conversion on the DAC's current outputs as well buffering the outputs. __ Linear Technology/Analog Devices App Note, Jul 2, 2012

DC Accurate Composite Amplifier -  Most individual op amp devices are optimized for either DC precision or for high speed operation.  A composite amplifier configuration uses a precision low offset and drift amplifier to control the dc biasing of a high speed amplifier.  This circuit has a gain bandwidth product of 1.25MHz yet an input offset voltage of only 25uV maximum. __ Linear Technology/Analog Devices App Note, Mar 26, 2010

Dead Zone Generator -  BIPOLAR SYMMETRY IS EXCELLENT BECAUSE ONE DEVICE, Q2, SETS BOTH LIMITS.  This circuit outputs 0V for a controlled range of input voltage.  When the input voltage exceeds the set voltage in either polarity the output signal moves with unity gain. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Design Notes 502: Matched Resistor Networks for Precision Amplifier Applications -  10/03/13  EDN-Design Notes   Two-quadrant multiplying DAC utilizes octal CMOS buffer.   Some ideal op amp configurations assume that the feedback resistors exhibit perfect matching.  In practice, resistor non-idealities can affect various circuit parameters such as common mode rejection ratio (CMRR), harmonic distortion and stability.  For instance, as shown in Figure 1, a single-ended amplifier configured to level-shift a ground-referenced signal to a common mode of 2.5V needs a good CMRR.  Assuming 34dB CMRR and no input signal, this 2.5V level shifter exhibits an output offset of 50mV, which can even overwhelm the LSB and offset errors of 12-bit ADCs and drivers. __ Circuit Design by Tyler Hutchison

Design Notes: 1.5A Rail-to-Rail Output Synchronous Step-Down Regulator Adjusts with a Single Resistor -  02/03/14EDN-Design Notes   One wire brings power & data to LCD moduleA new regulator architecture, the LTC3600   (first introduced with the LT3080 linear regulator), has wider output range and better regulation than traditional regulators.  Using a precision 50μA current source and a voltage follower, the output is adjustable from 0V to close to VIN.  Normally, the lowest output voltage is limited to the reference voltage __ Circuit Design by Jeff Zhang, also see Linear Technology Design Note 506

Differential Bridge Amplifier -  The LTC2050HV are zero-drift operational amplifi ers available in the 5- or 6-lead SOT-23 and SO-8 packages.  The LTC2050 operates from a single 2.7V to 6V supply.  The LTC2050HV operates on supplies from 2.7V to ±5.5V.  The current consumption is 800μA and the versions in the 6-lead SOT-23 and SO-8 packages offer power shutdown __ Linear Technology/Analog Devices App Note, Apr 29th 2010

Differential Bridge Amplifier with Gain Programmed through the Serial Interface & Analog to Digital Conversion (Standby Current Less than 100μA) -  The LTC6915 is a precision programmable gain instrumentation amplifier.  The gain can be programmed to 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096 through a parallel or serial interface.  The CMRR is typically 125dB with a single 5V supply with any programmed gain.  The offset is below 10μV with a temperature __ Linear Technology/Analog Devices App Note, Apr 29th 2010

Differential Front-End for the LTC2400 Rail-To-Rail -  Design Solutions 2 Design Notes __ Linear Technology/Analog Devices

Differentiator -  (spice design) __ Designed by Rick 

Digital potentiometer autonulls op Amp -  10/22/98 EDN-Design Ideas Op-amp applications that need the highest possible dc accuracy are generally best served by CMOS chopper-stabilized amplifiers, such as the LTC1050.  But high-speed, low-noise applications may require high-performance rockets, such as the 700-MHz LT1226.  So what to do for applications __ Circuit Design by Stephen Woodward, University Of North Carolina, Chapel Hill, NC

Discrete Differential Amplifier  -  Circuit Ideas for Designers App Note __ Advanced Linear Devices, Inc

Discrete Op-Amp -  Class-A Output.  Intended as an experimental device, works extremely well __ Designed by Rod Elliott  ESP

Discrete Op-amps -  It is not at all difficult to make an op-amp using transistors.  This page shows you how and discusses how they work.  I am not giving all circuit values here, just enough to describe operation.  Actual circuit values will depend on exactly what you want to do with the circuit.  Anyway, it's not necessary to have circuit values when you're trying to gain an understanding of how the circuit works __ Designed by Richard Torrens

Dual 25µV Micropower Op Amp Fits in 3mm X 3mm Package -  DN331 Design Notes __ Linear Technology/Analog Devices

Dual Audio-Signal Tracer -  The circuit described here is of a dual audio-signal tracer.  An audio-signal tracer is a simple device used to troubleshoot for audio signals in radio and other electronic circuitry.  The device is __ Electronics Projects for You

Dual Buffered ±0.617V Reference Powered by Two AA Batteries -  Lower opamp is a precision inverter setting outputs to set the outputs at the same magnitude but opposite polarity.  The upper opamp drives the positive output so that the difference of the two outputs is the reference voltage, so the result is that half the reference voltage is the magnitude of the outputs __ Linear Technology/Analog Devices App Note, Jun 21, 2010

Dual Op Amp Doubles Output Current -  09/12/96 EDN-Design Ideas Standard linear output current for high-speed op amps is approximately 30 to 40 mA.  When more current is necessary, the next available op amps provide approximately 200 mA but with a significant increase in cost and quiescent current.  Depending on the amount of current you need, you may find it more cost-efficient to configure a dual op amp-- [Tamara Ahrens, Elantec Inc, Milpitas, CA] __ Circuit Design by Tamara Ahrens, Elantec Inc, Milpitas, CA

Dual Op Amp Takes Absolute Difference -  06/06/12  EDN-Design Ideas The circuit takes the absolute value of the differences of two voltages using two single-supply ground-referenced op amps.  A traditional implementation of an absolute-difference function comprises a difference circuit followed by an absolute-value circuit; the entire circuit requires at least three op amps.  The design problem is complicated in single-supply-only systems, which usually require an artificial ground, typically one-half of the supply.  The circuit in Figure 1 takes the absolute value of the difference of two voltages using only two single-supply, ground-referenced op amps.  The circuit is designed for dc or low-speed operation. __ Circuit Design by Jessica MacNeil

Dual Polarity Amplifier has Digital Control -  09/12/96 EDN-Design Ideas The circuit in Figure 1 can amplify a signal either in an inverting or a noninverting mode.  When switch S1 is on and S2 is off, the circuit behaves as a regular inverting amplifier.  When S2 is on and S1 is off, the circuit feeds the signal to the noninverting input of the op amp; thus, the circuit behaves as a noninverting amplifier.  If S1 and S2 are monolithic analog switches, you __ Circuit Design by Rick Downs, Dallas Semiconductor Corp, Dallas, TX

Electric Guitar Preamplifier -  This is a circuit for a guitar preamplifier that can capture mechanical vibrations (any standard guitar pickup) and then convert them into an electrical signal.  The signal is then amplified by an audio amplifier. __ Electronics Projects for You

Electronic Horn -  Here’s a simple circuit of an electronic horn that is built around quadruple op-amp IC LM3900 (IC1). IC LM3900 has four independent op-amps (A1 through A4) with a large output voltage __ Electronics Projects for You

Energy-Tripped Breaker Trips After a Time Interval that Varies as a Function of Sensed Load Current -  The circuit of this circuit has three distinct parts – circuit breaking, current sensing and timing.  The circuit breaking function can be any type of electronically controlled relay or solid state switch, properly sized for voltage and current ratings of the load being protected.  Load current sensing is achieved via __ Linear Technology/Analog Devices App Note, Sep 7th 2011

Enkindle Your Appetite for the IoT -  RIOT RIOT is a free open source operating system (OS) based on micro-kernel architecture.  It is designed specifically for powering the Internet of Things (IoT).

Extended Dynamic Range 1MΩ Transimpedance Photodiode Amplifier -  The LTC6090 is a high voltage precision operational amplifier.  The low noise, low bias current input stage is ideal for high gain configurations.  The LTC6090 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies. __ Linear Technology/Analog Devices App Note, Dec 4th 2012

Extending Input Common Mode Range for LT1992 -  Tying the Vocm pin to the Vmid Pin and using two equal voltage dividers with external feedback resistors is used in this circuit to extend the input Common Mode Range of LTC1992. __ Linear Technology/Analog Devices App Note, Jul 2, 2012

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