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
MSP430 microcontrollers
Precision op amps (Vos<1mV)
Technical documentation
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Type | Title | Date | |
---|---|---|---|
* | Application note | Strain gauge bridge amplifier circuit with MSP430 smart analog combo (Rev. A) | Mar. 06, 2020 |
* | Application note | Single-supply strain gauge bridge amplifier circuit | Dec. 30, 2017 |
Application note | Discrete Wide Bandwidth INA Circuit (Rev. A) | Dec. 23, 2020 | |
Application note | How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) | Oct. 24, 2019 | |
E-book | Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) | Feb. 18, 2019 | |
Application note | Two op amp instrumentation amplifier circuit | Dec. 31, 2018 | |
Application note | Three op amp instrumentation amplifier circuit | Dec. 31, 2018 | |
User guide | Single-Supply Strain Gauge in a Bridge Configuration Design Guide | Nov. 02, 2015 |
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