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Amplifier Circuits:  Differential 
Differential Amplifiers:    #'s - C    D - K    L - Z 

Amplifier -- Main Page


Last Updated: December 31, 2017 06:46 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Designing with a New Family of Instrumentation Amplifiers -  DN40 Design Notes __ Linear Technology/Analog Devices

Diff Amp with Current Mirror -  In an audio input differential stage, you often see the simple collector resistor replaced with a current mirror.  Why bother? The payoff is two fold.  First, you get twice the gain and current output, typically a good thing for an audio amp.  And second (spice design)

Difference Amplifier -  The LT5400 is a quad resistor network with excellent matching specifications over the entire temperature range.  All four resistors can be accessed and biased independently, making the LT5400 a convenient and versatile choice for any application that can benefit from matched resistors. __ Linear Technology/Analog Devices App Note, Jun 23, 2011

Difference Amplifier measures high voltages -  28-Apr-05 EDN-Design Ideas __ Circuit overcomes self-induced error sources in high voltage measurement __ Circuit Design by Moshe Gerstanhaber and Chau Tran, Analog Devices, Wilmington, MA

Difference Amplifier uses digital potentiometers -  05/30/02 EDN-Design Ideas You sometimes need to measure a small signal in the presence of a large common-mode signal.  Traditional instrumentation amplifiers that use two or three op amps in their internal structure find common use in these applications. 

Difference Counter for In & Out Gates -  Sometimes, we need to know whether someone is still inside a building before it is locked.  And if so, how many persons are still inside? There can be many other similar __ Electronics Projects for You

Differential active splitter for ATE or RF signal distribution -  01/14/13  EDN-Design Ideas It is sometimes required to take a single ended or differential AC source and distribute it to more than one DUT or other element.  One example would be to distribute a differential AC test signal being generated in an ATE environment to either multiple te __ Circuit Design by Michael Steffes

Differential Amp drives high-speed ADC -  06/21/01 EDN-Design Ideas The schematic in Figure 1 is the discrete-element version of an A/D-converter drive circuit.  The circuit converts a single-ended input to a differential output.  The ADC's reference voltage determines the common-mode range of the differential outputs.  The circuit contains two AD9631 amplifiers—one connected in noninverting mode, and the other connected inPDF has several circuits, scroll to find this one.  -- [Chau Tran, Analog Devices Inc,Wilmington, MA] __ Circuit Design by Chau Tran

Differential Amp has 6dB lower noise, twice the bandwidth -  EDN-Design Ideas 04/28/2014     Differential/instrumentation amp topologies possess varying trade-offs.  Here’s one that improves noise & BW at the expense of input resistance __ Circuit Design by Roy McCammon

Differential Amp needs no power source -  05/02/02 EDN-Design Ideas A true-differential, power-source-free, high-input-impedance amplifier with bipolar output would present distinct advantages in remote devices.  Such an amplifier, with its bipolar output, would be a better choice than a unipolar, 4- to 20-mA device.  It would also improve on common-mode performance.  In Figure 1, a Maxim MAX319 analog switch, IC2, feeds the power from the coaxial signal cable to __ Circuit Design by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior, India

Differential Amplifier -  (spice design) __ Designed by Rick 

Differential Amplifiers Simplify Balanced Signal Designs -  DN333 Design Notes __ Linear Technology/Analog Devices

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 I/O low-power instrumentation Amp -  12/16/13  EDN-Design Ideas In-amps have differential inputs of course, but this one has a differential output too, along with controllable Vcm __ Circuit Design by Sandro Herrera

Differential Integrator with Frequency Controlled Gain -  Circuit Ideas for Designers App Note __ Advanced Linear Devices, Inc

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

Easy-To-Use Differential Amplifiers Simplify Balanced Signal Designs -  DN333 Design Notes __ Linear Technology/Analog Devices

Flying capacitor & negative time constant make digitally programmable gain instrumentation Amplifier -  02/05/09  EDN-Design Ideas Digitally programmable-gain instrumentation amplifiers prevent common-mode noise and variable signal amplitudes __ Circuit Design by W Stephen Woodward, Chapel Hill, NC

Gain Trimming in Instrumentation Amplifier Based Systems -  DN51 Design Notes __ Linear Technology/Analog Devices

Gain-of-three Amplifier requires no external resistors -  17-Aug-06 EDN-Design Ideas One IC provIdeas wideband amplification and minimizes parts count __ Circuit Design by Marián Stofka, Slovak University of Technology, Bratislava, Slovakia

Gain-of-two instrumentation Amplifier uses no external resistors -  02/15/07  EDN-Design Ideas Two ICs deliver precision gain with no external components.  An instrumentation amplifier offers precise gain without feedback resistors, and, at any value of gain, it provIdeas high input impedances at its noninverting and inverting inputs.  In a typical IC instrumentation amplifier, a single resistor that connects across two gain-adjustment pins determines the circuit's overall gain.  Integrated versions of most instrumentation amplifiers allow the pins to remain open for unity gain but require finite-value gain-setting resistors for gains exceeding one. __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

High Accuracy Differential to Single-Ended Conversion for Wide Range Bipolar Input Signals Bipolar Differential to Single-Ended Conver -  Design Solutions 4 Design Notes __ Linear Technology/Analog Devices

High-CMRR Instrumentation Amp Works with Low Supply Voltages -  2-Oct-03 EDN-Design Ideas Modern battery-cell voltages of 3 to 3.6V require circuits that offer efficient low-voltage operation.  This design idea proposes an ac-coupled instrumentation-amplifier design that features high CMRR(common-mode-rejection ratio], wide dc input-voltage tolerance, and a first-order highpass characteristic __ Circuit Design by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria

Impedance Matching for a Differential Amplifier with Fixed Gain Integrated Resistors -  Single ended to 50Ω Input Diff amp Example with Equations.  By AC coupling Impedance matching is the only issue.  AC coupling also realizes Auto input to output common mode level shifting. __ Linear Technology/Analog Devices App Note, Oct 3, 2012

In-Circuit Tester -  This is an in-circuit tester that to check correctly wired.  It can test a circuit board without be influenced by semiconductor parts. __ Designed by The Electronic Lives Manufacturing-presented Chan

Input filter prevents instrumentation-amp RF-rectification errors -  11/13/03  EDN-Design Ideas Instrumentation amplifiers serve in a variety of applications that need to extract a weak differential signal from large common-mode noise or interference.  However, designers often overlook the potential problem of RF rectification __ Circuit Design by Charles Kitchin, Lew Counts, and Moshe Gerstenhaber, Analog Devices, Wilmington, MA

Instrumentation Amp has differential outputs -  08/19/04  EDN-Design Ideas tate-of-the-art ADCs accept differential inputs, allowing you to differentially implement the entire signal path from sensor to converter.  This structure provIdeas significant performance advantages, because differential signals i __ Circuit Design by Moshe Gerstenhaber and Stephen Lee, Analog Devices, Wilmington, MA

Instrumentation Amp Has Low Offset, Drift & Low-Frequency Noise -  08/21/08 EDN-Design Ideas By cascading instrumentation amplifiers, you can achieve an instrumentation amplifier with decade-gain having low offset, drift and LF noise __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Instrumentation Amp makes an accurate transimpedance Amp too -  EDN-Design Ideas 03/23/2015    The interesting topology in This Design Idea turns a monolithic in-amp into a good transimpedance amp for photodiode or similar applications __ Circuit Design by Stefano Salvatori

Instrumentation Amp makes noninverting integrator -  09/19/02 EDN-Design Ideas Figure 1a shows the classic implementation of an integrator.  The circuit has two properties that may be undesirable in same applications  It necessarily inverts, and it requires a split-supply or midsupply reference.  Figure 1b shows an implementation of an integrator that uses an LT1789 instrumentation amplifier __ Circuit Design by Glen Brisebois, Linear Technology Corp, Milpitas, CA

Instrumentation Amp provides unipolar & bipolar outputs -  03-Aug-00 EDN-Design Ideas Intelligent sensors and signal conditioners for plant-automation systems must produce outputs compatible with standard data-acquisition systems, such as PCs, programmable logic controllers, and remote terminals for supervisory and control systems.  Standard analog inputs are 0 to 1V, ±10V, 0 to 1 mA, and 4 to 20 mA.  The circuit in Figure 1 makes all these signals available, using only three packages in addition to the DAC __ Circuit Design by David Rathgeber, Alles Corp, Toronto, ON, Canada

Instrumentation Amp Swings Rail-To-Rail -  03/03/94 EDN-Design Ideas You can combine an instrumentation amplifier and an inexpensive CMOS op amp to get the better of two worlds  the precision of a bipolar instrumentation amp and the5V single-supply operation of the CMOS op amp.  The characteristics of such a circuit __ Circuit Design by R Mark Stitt, Burr-Brown,  Tucson, AZ

Instrumentation Amp works from one supply -  03/16/00 EDN-Design Ideas Many single-supply applications need precision amplifiers that can operate from 5V or lower.  Although many precision, single-supply op amps are currently available for configuring as 2- and 3-amplifier instrumentation amplifiers (IAs), these designs require great attention to detail to achieve accuracy and precision. __ Circuit Design by Adolpho Garcia

Instrumentation Amplifier Compensates System Offset from Single Supply -  19-Mar-09 EDN-Design Ideas An instrumentation amp operates from one supply and lets you reset the system offset by applying a positive correction voltage to the VREF input __ Circuit Design by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy

Instrumentation Amplifier extends DSO -  01/05/06 EDN-Design Ideas Elusive current waveforms required scope documentation.  To determine the specifications of a solar-generating plant, I needed to accurately measure the load current a product consumed.  The product switched several internal devices on and off during an interval of several seconds.  An ammeter showed that the current transitions occurred too quickly for visual logging, and my managers had requested an oscilloscope photo of the current waveform's peaks __ Circuit Design by Bob Perrin, Sacramento, CA

Instrumentation Amplifier Has 290-Mhz GB -  05/12/94 EDN-Design Ideas very high frequency instrumentation amplifier based on video-difference amplifier __ Circuit Design by Paul Hendricks, Analog Devices, Wilmington, MA

Instrumentation Amplifier Is Less Sensitive to Resistor Mismatch -  12/02/10 EDN-Design Ideas Correcting phase with a third amplifier improves the two-amp design.  [Design Ideas by Reza Moghimi, Analog Devices, San Jose, CA __ Circuit Design by Reza Moghimi, Analog Devices, San Jose, CA

Instrumentation Amplifier with ±300V Common Mode Range & CMRR > 150dB -  The differential input voltage is sampled on a flying capacitor and then its charge is transferred to a fixed capacitor with is then amplified to produce an output voltage.  The use of high voltage photo driven FET switches rejects very high input common mode voltages. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Instrumentation Amplifier with Shield Driver -  This is a variation on the standard 3-stage implementation of an Instrumentation Amplifier function.  The gain resistor structure between the input op amps provides a mid-point potential that represents the average of the incoming signals.  The average level is buffered and back-drives the shields of the signals so there are __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Instrumentation Applications for a Monolithic Oscillator -  Linear Technology AN93 __ Designed by Jim WilliamsFeb 1st, 2003

Instrumentation Applications for a Monolithic Oscillator -  AN93 Instrumentation applications for a monolithic programmable oscillator are presented in this publication.  Circuits include platinum and thermistor based thermometers, an isolated thermometer and three relative humidity signal conditioners.  Bipolar and FET input c (add 1/06) __ Linear Technology/Analog Devices

Instrumentation Applications for High Accuracy Temperature Monitor Products -  Thermal management is a critical part of system design.  FPGAs and processors often require heat sinks and fans, to the extent that a failure (stopped fan or obstructed heat sink) would cause damage.  These devices often have a pin connected to an on-die diode temperature sensor.  It is also useful to know the temperature of other __ Linear Technology/Analog Devices App Note, Leo Chen Aug 24th 2011

Instrumentation-Amplifier-Based Current Shunt Exhibits 0V Drop -  27-Nov-08 EDN-Design Ideas A current-to-voltage converter has 0V drop __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Isolation Amplifier Suits Industrial Applications -  02/03/00  EDN-Design Ideas The circuit in Figure 1a is a low-cost isolation amplifier for instrumentation applications that provIdeas as much as 500V of galvanic isolation between input and output.  The amplifier uses only one small, low-cost transformer and with little modification __ Circuit Design by Andrew Russell, Philips Semiconductors, Hazel Grove, England

Differential Amplifiers:    #'s - C    D - K    L - Z 

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