CIRCUIT060006

Bridge amplifier circuit

CIRCUIT060006

Overview

A strain gauge is a sensor whose resistance varies with applied force. To measure the variation in resistance, the strain gauge is placed in a bridge configuration. This design uses a 2 op amp instrumentation circuit to amplify a differential signal created by the change in resistance of a strain gauge. By varying R10, a small differential voltage is created at the output of the Wheatstone bridge which is fed to the 2 op amp instrumentation amplifier input.
Features
  • Single 5V supply with half-supply reference
  • Input: -2.22mV to 2.27mV differential
  • Output: 225mV - 4.72V
  • Strain gauge resistance variation: 115 - 125 Ohms
  • Gain: 1001V/V
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Technical documentation

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Type Title Date
Circuit design Strain gauge bridge amplifier circuit with MSP430 smart analog combo (Rev. B) PDF | HTML Oct 8, 2024
Circuit design Two op amp instrumentation amplifier circuit (Rev. A) PDF | HTML Sep 26, 2024
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. D) PDF | HTML Sep 24, 2024
Circuit design Single-Supply Strain Gauge Bridge Amplifier Circuit (Rev. A) PDF | HTML Apr 26, 2023
Circuit design Three Op Amp Instrumentation Amplifier Circuit (Rev. A) PDF | HTML Mar 30, 2022
Circuit design Discrete Wide Bandwidth INA Circuit (Rev. A) PDF | HTML Dec 23, 2020
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML Oct 24, 2019
Design guide Single-Supply Strain Gauge in a Bridge Configuration Design Guide Nov 2, 2015

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