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

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Last Updated: June 02, 2021 01:44 PM

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-/+-0.1V Differential Amplifier using Zero Threshold EPAD MOSFETs -  This circuit presents a differential amplifier using Zero Threshold EPAD MOSFETs that oooooperates on 1/- 0.1v supplies.    The schematic diagram is for a single amplifier stage __ Advanced Linear Devices, Inc

±250V Common Mode Range Difference Amplifier (AV = 1) -  This is a modified difference amplifier- it has effectively added resistances from each input to ground to attenuate the common mode signal.  This allows the wide input range without exceeding the VCM of the opamp. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

±5V Precision Instrumentation Amplifier -  A flying capacitor is ideal for virtually eliminating dc and low frequency common mode errors.  This is desired for a low voltage differential to single ended instrumentation amplifier stage. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

∑-∆ Isolation Amplifier transfers low frequencies across barrier -  EDN-Design Ideas 08/02/2013    Running a ∑-∆ stream over the barrier makes for an inexpensive analog isolator.   The isolation amplifier circuit of Figure 1 is simple but accurate.  With the values shown it converts 0 to 5V DC or low frequency signals with unity gain, but you can adjust the gain by changing R4. Design by Francesc Casanellas

10°C to 40°C Thermistor Thermometer -  The LT1789 is a micropower, precision instrumentation amplifiers that are optimized for single supply operation from 2.2V to 36V.  The quiescent current is 95μA max, the inputs common mode to ground and the output swings within 110mV of ground.  The gain is set with a single external resistor for a gain range of 1 to 1000 for __ Linear Technology/Analog Devices App Note, Mar 30th 2010

2 Instrumentation Amps Make Accurate Voltage-To-Current Source -  14-May-09 EDN-Design Ideas Many designs require precise voltage-controlled current sources, especially in the presence of variable loads.  Common approaches, which use a few op amps and a handful of passive components, have inherent errors due to nonideal component characteristics, such as finite open-loop gain, common-mode rejection, bias current, and offset voltage Design by Frank Ciarlone, Analog Devices, Wilmington, MA

2.7V to 5.5V Precision High Side Current Sense -  This high side current sense amplifier works down to 2.7V.  Even with such a low supply voltage, accuracy of the voltage sensed across resistor Rs is preserved due to the very low voltage offset error of the LTC6078 amplifier   (7uV typical). __ Linear Technology/Analog Devices App Note, Mar 16th 2010

2.7V to 5.5V Ultra High Precision Current Sense -  This is a low-voltage, ultra-high-precision monitor featuring a Zero-Drift Instrumentation Amplifier   (IA) that provides Rail-to-Rail inputs and outputs.  Voltage gain is set by the feedback resistors.  Accuracy of this circuit is set by the quality of resistors selected by the user, small-signal range is limited by VOL in single-supply __ Linear Technology/Analog Devices App Note, Mar 30th 2010

25 Hz Peaking Amplifier-Using Model 425 -  No description, just graphOpAmps Lab Inc is the manufactor ofAmplifiers   (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power), Switchers   (Routing / Assign / Matrix), Mult   (Press)   (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems. __ Application OpAmps Lab Inc.

85V, –100V Common Mode Range Instrumentation Amplifier (AV = 10) -  The input section is a classic difference amplifier set to A=0.1so that the Vcm is attenuated by 10x along with the signal of interest.  The second section has A=100 so that the overall circuit has A=10 but yet supports a large Vcm working range. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

A Clock for All Reasons -  Linear Technology AN93 __ Designed by Jim WilliamsFeb 1st, 2003

A Single Amplifier Precision High Voltage Instrument Amp -  DN25 Design Notes __ Linear Technology/Analog Devices

A Single-Ended Input to Differential Output Amplifier -  This circuit shows a circuit for generating a differential signal from a single-ended input.  The differential output noise is a function of the noise of the amplifiers, the noise of resistors R1 and R2 and the noise bandwidth.  For example, if R1 and R2 are each 200W, the differential output voltage noise density is 9.5 nV/ÖHz and in a 4MHz noise bandwidth, the total differential output noise is 19mVRMS   (with a low level 0.2VRMS differential signal, the signal-to-noise ratio is an excellent 80.4dB). __ Linear Technology/Analog Devices App Note, Jul 2, 2012

AC Couple Analog Signals without a DC Bias Source -  02/03/00 EDN-Design Ideas A conventional ac-coupling circuit in a single-supply system comprises a series capacitor and a shunt resistor to ground.  Unfortunately,  negative peaks of  input signal can exceed 0.3V input operating-range limits of an ADC, such as  LTC1402 serial 12-bit sampling ADC.  To avoid going below ground,  circuit must return  shunt input Design by Joseph Luis Sousa, Linear Technology Corp, North Chelmsford, MA

AC line powers microcontroller-based fan-speed regulator -  9-Nov-06 EDN-Design Ideas A microcontroller requires dc operating power in the 2 to 5.5V range, an amount that a battery or a secondary power source can easily supply.  However, in certain situations, a microcontroller-based product must operate directly from a 120 or 220V-ac power outlet without a step-down transformer or a heat-producing, voltage-decreasing resistor. Design by Abel Raynus, Armatron International Inc, Malden, MA

AC-coupling instrumentation Amplifier improves rejection range of differential DC input voltage -  09/30/04 EDN-Design Ideas The need for conditioning lowlevel ac signals in the presence of both common-mode noise and differential dc voltage prevails in many applications.  In such situations, ac-coupling to instrumentation and difference amplifiers Page includes several designs.  Scroll to find this one Design by Francis Rodes, Olivier Chevalieras, and Eliane Garnier, ENSEIRB, Talence, France

Active-feedback IC serves as current-sensing instrumentation Amplifier -  24-Jul-03 EDN-Design Ideas High-speed current sensing presents a designer with some significant challenges.  Most techniques for sensing current involve measuring the differential voltage the current produces as it flows through a sense element, such as a resistor or a Hall-effect device.  The differential voltage across the sense element is generally small and is often riding on a common-mode voltage that is considerably Design by Jonathan Pearson, Analog Devices, Wilmington, MA

Amplifier & Current Source Emulate Instrumentation Amplifier -  11/13/03  EDN-Design Ideas The classic three- or two-op-amp instrumentation-amplifier circuits are standard ways to amplify a small-amplitude differential signal contaminated with high common-mode noise.  In some applications, the signal source is floating wi Design by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria

Amplifier cancels common-mode voltage -  10-May-07 EDN-Design Ideas You can eliminate common-mode-voltage errors with this amplifier circuit that subtracts out the error Design by W Stephen Woodward, Chapel HIll, NC

Amplifier compensates piezoelectric-rate gyros -  12/09/99 EDN-Design Ideas Low-power, low-cost ceramic piezoelectric rate gyros are available,  but they lack the low-temperaturecoefficient characteristics of their quartz counterparts.  However, you.   PDF has several circuits, scoll to find this one. Design by Jim Mahoney, Linear Technology Corp, Milpitas, CA

Amplifier removes common-mode noise on RGB differential-video-transmission line -  04/13/06  EDN-Design Ideas Use a single operational amplifier to minimize common-mode signals' effects on differential-component-video receivers Design by Tamara Papalias and Mike Wong, Intersil Corp

AN3Applications for a Switched-Capacitor Instrumentation Building Block -  Linear Technology AN3 __ Designed by Jim WilliamsJul 1st, 1985

AN-60-034  Transient Protection of Darlington gain block Amplifiers -  AN-60034  Application Note __ MiniCircuits.com

AN93Instrumentation Applications for a Monolithic Oscillator: A Clock for All Reasons -  Linear Technology AN93 __ Designed by Jim WilliamsFeb 1st, 2003

Applications for a Switched-Capacitor Instrumentation Building Block -  Linear Technology AN3 __ Designed by Jim WilliamsJul 1st, 1985

Audible continuity Tester -  A logic tester with an audible indicator can be handy when troubleshooting or testing a crowded circuit board.  It allows you to keep your eyes on the circuit, rather than on a LED on the tester.  The project described in this article is just such a tester.  It provides an audible indication of the logic level of the signal presented to its input __ Designed by Tony van Roon  VA3AVR

Automatic-exposure scheme uses CCD shutter -  EDN-Design Ideas July 2, 1998        [ NOTE : File has multiple design, scroll for this one.]  This application follows the Design Idea, "Peak detector maximizes CCD-sensor range"   (EDN, Aug 15, 1996).  Its aim was to optimize the performance of an A/D converter used to digitize a linear CCD sensor's analog output.  The method involved stretching the upper reference of the flash ADC for the highest lit pixel in the array.  The method works well, but does not obtain the best performance from the CCD, which can saturate for overexposure or can produce noise for underexposure. Figure 1 shows a better method that you can use with CCD sensors that provide a shutter facility.  The shutter signal in a modern CCD array   (such as the Sony ILX703A) removes the electrical charges the light produces during the exposure. Design by Giovanni Romeo and Sandro Rao, Istituto Nazionale Di Geofisica, Rome, Italy

Autozero a position-sensing Detector -  03/18/99 EDN-Design Ideas Autozeroing schemes can be necessary to minimize the input-offset voltages of position-sensing detectors   (PSDs), particularly when you use these detectors with high dc gain.  PSDs are useful optical transducers for accurately measuring displacement.  In practice, their typical configuration is as a differential current-to-voltage circuit   (Figure 1). Design by James Zannis, Renishaw A, Champs-sur-Marne, France

Autozeroed Amplifier with halved noise needs few components -  10/25/07 EDN-Design Ideas The unique architecture of the Analog Devices AD8553 instrumentation amplifier permits paralleling devices to lower noise Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Composite Instrumentation Amplifier Challenges Single-Chip Device for Bandwidth, Offset & Noise -  12-Jun-08 EDN-Design Ideas By cascading the instrument amplifiers, you can achieve higher bandwidth and lower noise than with a single-chip amplifier Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Current Output, High Speed, High Input Impedance Instrumentation Amplifi er -  This is a variation on the standard 3-stage implementation of an Instrumentation Amplifier function.  The output sense resistor, along with the extra op amp for feedback sensing, form a Howland current-source structure for generating precision output current. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Current-mode instrumentation Amplifier enhances piezoelectric accelerometer -  11/23/06 EDN-Design Ideas suppresses capacitively coupled noise pickup by piezoelectric sensor and its wiring Design by Dave Wuchinich, Modal Mechanics, Yonkers, NY

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

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