SLOA313 May 2021 AFE7070 , AFE7071
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.
| 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 |
Figure 2-15 CF vs Frequency Over
Temperature
Figure 2-16 SBS vs Frequency Over
Temperature