SBAA555 august   2023 AFE8092

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2RF Droop
    1. 2.1 Reasons Behind RF Droop
    2. 2.2 Digital Correction of RF Droop
    3. 2.3 Overview of RF Droop Correction Measurements
    4. 2.4 Enabling the RF Droop Correction
    5. 2.5 Example for Using the RF Droop Correction
    6. 2.6 Frequency Response Before and After Droop Correction and Limitations
  6. 3Summary
  7. 4References

2.2 Digital Correction of RF Droop

The new AFE8092 RF droop correction block corrects the non-flat frequency response mentioned above using digital correction. The digital correction block implements a second order fit to correct for the RF droop. Therefore, to determine the correction parameters, we need droop measurements taken at 3 frequencies: FNCO, FNCO + ΔF and FNCO – ΔF, where FNCO is center frequency of the given band. Typically, ΔF is chosen to be close to 0.4 × (Transmit data interface rate). Assume the difference in amplitude at frequencies FNCO – ΔF and FNCO to be M1 and between the frequencies FNCO + ΔF and FNCO to be M2.