Resistive Detector

The circuit below shows a resistor (R1) that converts the sensor current (ISEN) to a voltage, as well as a difference amplifier that amplifies the voltage across the resistor while rejecting common mode noise.

resistive-detector.png

Advantages:

  • Good rejection of common mode noise
  • Resistive isolation from the source
  • Wide input voltage range

Disadvantages:

  • Resistive loading of the source
  • Input stage distortion

Sensor Examples:

  • High-side current sensor
  • AC line current

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