SENSOR AMPLIFIER CIRCUIT
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United States of America
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Issued Date -
Feb 20, 2025
app pub date -
Nov 1, 2024
filing date -
Nov 1, 2024
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Abstract
A sensor amplifier circuit includes a differential amplifier circuit and a compensation circuit. The differential amplifier circuit is configured to amplify a difference voltage between a pair of output signals from a sensor circuit and generate an output voltage. The compensation circuit is configured to generate a compensation signal based on the output voltage to compensate for a non-linear distortion of the output voltage. The differential amplifier circuit includes a current feedback instrumentation amplifier (CFIA). The compensation circuit includes one or more operational transconductance amplifiers (OTAs) configured to output one or more electric currents based on the output voltage and outputs a sum of the one or more electric currents from the one or more operational transconductance amplifiers as the compensation signal. The compensation signal from the compensation circuit is input to a current feedback loop in the current feedback instrumentation amplifier.
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