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OPA197: Offset shift mechanism during EMI to IN+

Taketo Sato
Genius 9475 points
Part Number: OPA197

Hello team,

OPA197 integrates EMI filter inside the device and can reduce EMI effect from the source.

However, I think we still see the effect(offset shift on output) even with device integrating EMI filter such like OPA197.

  1. In the first place, how is EMI(high frequency signal) converted to offset shift on output?
    SBOA128 explains internal diodes(silicon p-n junction) works as rectification and it converts ac to dc. However I would like to know more detail if possible.
  2. Does the conversion occurs at input stage when EMI is applied to IN+?
  3. Does the rectification work even if EMI signal is small?
  4. Is Integrated EMI filter simple 1st order RC?
  5. If attenuation by the filter is not enough then we will see offset shift on output and this is EMIRR IN+ performance, correct?  

Best regards,