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Amplifier Circuits: Instrumentation 

Instrumentation Amplifiers:   #G        HL        MZ

Amplifier -- Main Page  

Last Updated on: Thursday, November 30, 2017 07:37 AM

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±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. __ Circuit 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 __ Circuit 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

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

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 __ Circuit 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. __ Circuit 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 __ Circuit 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 __ Circuit 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 __ Circuit 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 __ Circuit 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. __ Circuit Design by Jim Mahoney, Linear Technology Corp, Milpitas, CA

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

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 __ Circuit 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 __ Circuit 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 __ Circuit suppresses capacitively coupled noise pickup by piezoelectric sensor and its wiring __ Circuit Design by Dave Wuchinich, Modal Mechanics, Yonkers, NY

Designing with a New Family of Instrumentation Amplifiers -  DN40 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

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

Instrumentation Amplifiers:   #G        HL        MZ

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