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CIRCUIT060025

Two op amp instrumentation amplifier circuit

CIRCUIT060025

Overview

This design amplifiers the difference between Vi1 and Vi2 and outputs a single ended signal while rejecting the common–mode voltage. Linear operation of an instrumentation amplifier depends upon the linear operation of its primary 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:
    • min V = ±1 V
    • max V = ±2 V
  • Output: ±10 V
  • Supply:
    • Vcc = 15 V
    • Vee = -15 V
    • Vref = 0 V
  • Vcm: ±10 V
  • Gain range: 5 V/V to 10 V/V
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
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Technical documentation

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Type Title Date
* Circuit design Two op amp instrumentation amplifier circuit PDF | HTML 31 Dec 2018
* Analog Design Journal VCM vs. VOUT plots for instrumentation amplifiers with two op amps 30 Oct 2015
Analog Design Journal Measuring the linear operating region of instrumentation amplifiers 24 Oct 2016
Analog Design Journal Linear operating region of two-op-amp instrumentation amplifiers with gain stage 21 Jul 2016

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