Digital IF Equalization

Digital IF equalization is a calibration that involves measuring and then compensating for IF magnitude and phase response.

IF equalization calibration gives the PXIe-5665 the ability to measure lower levels of error vector magnitude (EVM). For spectrum measurements, IF equalization results in a higher degree of magnitude accuracy across the IF bandwidth.

To achieve the desired IF flatness and overall accuracy specifications, equalization must be performed. Equalization attempts to correct for the following factors:

  • Frequency response of the digitizer
  • RF response of the downconverter
  • IF response of the downconverter

To enable digital IF equalization, use either the Digital IF Equalization Enabled property or the NIRFSA_ATTR_DIGITAL_IF_EQUALIZATION_ENABLED attribute.