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Bridge Completion

Last Modified: November 16, 2017

Unless you are using a full-bridge sensor, you must complete the bridge with reference resistors. Therefore, signal conditioners for bridge-based sensors typically provide half-bridge completion networks consisting of two high-precision reference resistors. The nominal resistance of the completion resistors is less important than how well the two resistors match. Ideally, the resistors match well and provide a stable reference voltage of VEX/2 to the negative input lead of the measurement channel. The high resistance of the completion resistors helps minimize the current draw from the excitation voltage. However, using completion resistors that are too large can result in increased noise and errors due to bias currents.

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