CIRCUIT060026

Three op amp instrumentation amplifier circuit

CIRCUIT060026

Overview

This design uses three op amps to build a discrete instrumentation amplifier. The circuit converts a differential signal to a single-ended output signal. Linear operation of an instrumentation amplifier depends upon linear operation of its building block: op amps. An op amp operates linearly when the input and output signals are within the device’s input common-mode and output swing ranges, respectively. The supply voltages used to power the op amps define these ranges.
Features
  • Input: ± 0.5 V
  • Common mode voltage: ± 7 V
  • Output: ± 5 V
  • Supply:
    • Vcc = 15 V
    • Vee = -15 V
    • Vref = 0V
General-purpose op amps
OPA172 Single, 36-V, 10-MHz, low-power operational amplifier TLV171 Single, 36-V, 3-MHz, low-power operational amplifier for cost-sensitive applications
Precision op amps (Vos<1mV)
OPA192 High-Voltage, Rail-to-Rail Input/Output, 5µV, 0.2µV/˚C, Precision Operational Amplifier

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Technical documentation

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Type Title Date
* Circuit design Three Op Amp Instrumentation Amplifier Circuit (Rev. A) Mar. 30, 2022
Circuit design Space-Grade, 100-krad, Discrete, Three Op Amp Instrumentation Amplifier Circuit Jun. 28, 2021
Analog Design Journal Measuring the linear operating region of instrumentation amplifiers Oct. 24, 2016
Analog Design Journal Getting the most out of your instrumentation amplifier design Oct. 10, 2005

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