Improve Noise Immunity On RTD Ratiometric Measurements (.PDF Download)

April 23, 2013

In a typical resistance temperature detector(RTD) measurement application, the delta-sigma converter often is configured in a ratiometric topology using a constant current excitation source. Although external RC filters aren’t necessarily required to achieve an effective ratiometric measurement, adding external filters may prove to be beneficial in applications where the RTD sensor is located remotely in a noisy environment or where sensors are prone to noise pickup.

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