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BRIDGE_CIRCUIT_WITH_ONE_POWER_SUPPLY

2016-05-15 08:22  
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BRIDGE_CIRCUIT_WITH_ONE_POWER_SUPPLY
For systems with only one power supply, two op amps act as instrumentation and buffer amps. The OPA111AM buffers the reference mode of the bridge and applies that voltage to the instrumentation amps REF terminal. Output is taken between the amplifier outputs to exclude the fixed output offset. The additional op amp creates a bridge error of IB x R/2, where IB = bias current of op amp and fi is the resistance of one leg of the bridge.