Home
Design & development

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
Download View video with transcript Video

Technical documentation

star
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 8
Type Title Date
* Circuit design Strain gauge bridge amplifier circuit with MSP430 smart analog combo (Rev. B) PDF | HTML 08 Oct 2024
* Circuit design Single-Supply Strain Gauge Bridge Amplifier Circuit (Rev. A) PDF | HTML 26 Apr 2023
Circuit design Two op amp instrumentation amplifier circuit (Rev. A) PDF | HTML 26 Sep 2024
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. D) 24 Sep 2024
Circuit design Three Op Amp Instrumentation Amplifier Circuit (Rev. A) PDF | HTML 30 Mar 2022
Circuit design Discrete Wide Bandwidth INA Circuit (Rev. A) PDF | HTML 23 Dec 2020
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
Design guide Single-Supply Strain Gauge in a Bridge Configuration Design Guide 02 Nov 2015

Related design resources

Design tools & simulation

SIMULATION TOOL
TINA-TI — SPICE-based analog simulation program
CALCULATION TOOL
ANALOG-ENGINEER-CALC — Analog engineer's calculator

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support.

Videos