Bridge amplifier circuit
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Key Document


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.

  • 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

Technical documentation
Application note (6)
Title Type Size (KB) Date
PDF 565 23 Dec 2020
PDF 694 06 Mar 2020
PDF 440 24 Oct 2019
PDF 147 31 Dec 2018
PDF 192 31 Dec 2018
PDF 208 30 Dec 2017
User guide (1)
Title Type Size (KB) Date
PDF 861 02 Nov 2015
E-book (1)
Title Type Size (KB) Date
PDF 11294 18 Feb 2019

Design tools & simulation (2)

Name Part Number Tool Type
Analog engineer's calculator  ANALOG-ENGINEER-CALC  Calculation tool 
SPICE-based analog simulation program  TINA-TI  Simulation tool 

TI Devices (6)

Part Number Name Product Family
MSP430FR2310  16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC  Microcontrollers (MCUs) 
MSP430FR2311  16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/ DAC, 10-bit AD  Microcontrollers (MCUs) 
MSP430FR2353  24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD  Microcontrollers (MCUs) 
MSP430FR2355  24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD  Microcontrollers (MCUs) 
OPA376  Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp  Operational amplifiers (op amps) 
TLV9002  2-channel, 1-MHz, RRIO, 1.8-V to 5.5-V operational amplifier  Operational amplifiers (op amps) 

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