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Hi,
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.
Regards,
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