Bridge amplifier circuit CIRCUIT060006 (ACTIVE)

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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 Documents
Application notes (4)
Title Type Size (KB) Date
PDF 147 31 Dec 2018
PDF 192 31 Dec 2018
PDF 155 30 Dec 2017
PDF 208 30 Dec 2017
User guides (1)
Title Type Size (KB) Date
PDF 861 02 Nov 2015
Solution guides (1)
Title Type Size (KB) Date
PDF 11259 18 Feb 2019

Development Tools (2)

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

TI Devices (2)

Part Number Name Product Family
OPA376  Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps) 
TLV9002  2-Channel, 1MHz, RRIO, 1.8V to 5.5V Operational Amplifier for Cost-Optimized Systems  Operational amplifiers (op amps) 

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