Single-Supply, Low-Power Measurements of Bridge Networks
by Bonnie Baker

Bridge sensor measurements often need to be made in systems operating on a single 5V power supply. An OPA1013 dual op amp along with a REF200 current source, makes an excellent bridge measurement system which features low power single-supply 5V operation and immunity to power supply variations. One OPA1013 dual op amp is used as a two-op-amp instrumentation amplifier. A second OPA1013 is used with a REF200 to make two voltage references. One voltage reference is used to power the bridge, the other is used to offset hte instrumentation amplifier.

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