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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
General-purpose op amps
TLV9002 — Dual, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications
MSP430 microcontrollers
MSP430FR2310 — 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 — 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2353 — 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 — 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Precision op amps (Vos<1mV)
OPA376 — Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Technical documentation

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Type Title Date
* Circuit design Strain gauge bridge amplifier circuit with MSP430 smart analog combo (Rev. A) PDF | HTML Mar. 06, 2020
* Circuit design Single-supply strain gauge bridge amplifier circuit Dec. 30, 2017
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) Oct. 05, 2022
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
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) Feb. 18, 2019
Circuit design Two op amp instrumentation amplifier circuit Dec. 31, 2018
Design guide Single-Supply Strain Gauge in a Bridge Configuration Design Guide Nov. 02, 2015

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