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

2.9 Composite Results With the NCO

Using the NCO tuning algorithm, it is possible to cover the RF range from 136 MHz to the 174 MHz in three frequency chunks with about 13 MHz per chunk. The NCO is varied from +6.5 MHz to –5.5 MHz around the LO set-point values of: 141.5 MHz, 153.5 MHz, and 166.5 MHz. No frequency adjustment is required; it is assumed the NCO variation over frequency is negligible. The static temperature slope values from Table 2-2 are applied as needed for temperature, characterized at the new static LO set-points. Figure 2-15 and Figure 2-16 show the composite performance over frequency and over temperature range across the entire band.

Table 2-2 Temperature Slope vs Mid-sub-band Frequencies
Temperature Slope Parameter 141.5 MHz 153.5 MHz 166.5 MHz
mT_DCI –0.104 –0.091 –0.097
mT_DCQ 0.067 0.06 0.06
mT_Gain –0.046 –0.059 –0.073
mT_Phase 1.81 1.63 1.481
GUID-20210428-CA0I-49D7-Z8Q7-V9JFC2DHJVQK-low.pngFigure 2-15 CF vs Frequency Over Temperature
GUID-20210428-CA0I-C1LJ-H4SN-3F05HGXTXXNC-low.pngFigure 2-16 SBS vs Frequency Over Temperature