Resistive sensor based data acquisition system using low distortion analog front-end and digital gain error correction

A method for using a data acquisition system (DAS) to process an input signal from a resistive sensor, comprising:

• digitizing, by a sensor signal path of the DAS, the input signal;
• wherein an input impedance of the sensor signal path attenuates the input signal from the resistive sensor;
• applying, in a digital domain, a gain error correction factor to the digitized input signal to compensate for a loading effect to the resistive sensor;
• characterizing, by a sensor characterization path of the DAS, a resistance of the sensor;
• and
• using the characterized sensor resistance to determine the gain error correction factor.

A method using a system to measure a signal from a Hall effect sensor, comprising:

• the system having a measurement resistance that attenuates the signal from the Hall effect sensor;
• measuring the signal from the Hall effect sensor;
• measuring a resistance of the Hall effect sensor;
• calculating a gain error correction factor as a function of the measurement resistance of the system and the measured resistance of the Hall effect sensor;
• and
• applying the gain error correction factor to the measured signal from the Hall effect sensor.