SLOA313 May   2021 AFE7070 , AFE7071

 

  1.   Trademarks
  2. 1Introduction
  3. 2CF and SBS Characterization
    1. 2.1 Variation Over Frequency
    2. 2.2 Variation Over Power Supply
    3. 2.3 Variation Over LO Drive Level
    4. 2.4 Variation Over Temperature
    5. 2.5 Compensation Algorithm
    6. 2.6 Algorithm Calculations
    7. 2.7 Composite Results
    8. 2.8 Mitigate Frequency Variation With the NCO
    9. 2.9 Composite Results With the NCO
  4. 3Conclusion

3 Conclusion

With just 3 frequency calibration points, the AFE7070 yields excellent CF and SBS performance across temperature and frequency. The CF performance maintains better than –65 dBm across frequency and temperature. The SBS maintains around –60 dBc across frequency and temperature. Note, the measured performance data utilized the LMX2572LP synthesizer device with harmonic filter for the LO, so the LO variation is built in to the results.

The data outlined here focused on the VHF band, but the technique is applicable to any frequency band within the range of the AFE7070 device. With a different band, a new set of frequency and temperature slope characterization is required. With that data, the same algorithm approach will yield optimized results across the desired frequency range and temperature.