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Part Number: OPA4188


I am using OPA4188AIPWR for low side current sensing circuit. In the normal condition output I am getting is OK but if I introduce noise at the input I am not getting the exact waveform it's a noisy one. I am using first order low pass filter at the output of the OPAMP. Is there any other filter design I can use so that I get the desired waveform. If you suggest it would be helpful. FYI The output of the circuit goes to ADC.


Ajay Sahu

  • Hello Ajay,

    Are you able to share your OPA4188 schematic, power supply arrangement and observed waveforms? That would provide us much more information to consider. Since this is a low-side sensing circuit just how low does the output voltage have to go?

    If filtering is applicable we likely could configure the low-side voltage sense circuit to include an active low-pass response to help reduce the noise.

    Thanks, Thomas

    Precision Amplifiers Applications Engineering

  • Hi Thomas,

    My issue has been resolved.