ZHCU772 December 2021
Table 2-3 shows the measured transmitter performance results in terms of SFDR and IMD3 for 2x2TX_44210 mode and an interpolation factor of 18. Measured SFDR and IMD3 of the AFE7950 with the proposed TIDA-010230 clocking solution are improved from the AFE7950EVM using the internal PLL clocks and is comparable with the external clock source from the signal generator.
| Parameters | Conditions | Unit | AFE7950 Data Sheet Specifications |
TIDA-010230 Measured | AFE7950EVM Measured (INT CLK) | AFE7950EVM Measured (EXT CLK) |
|---|---|---|---|---|---|---|
| SFDR | For 0-FDAC/2 BW, DSA – 0 dB, –1 dBFS; | |||||
| 850 MHz | dBc | 50.8 | 34.35 | 33.98 | 34.1 | |
| 1800 MHz | dBc | 51.9 | 45.21 | 44.15 | 45.15 | |
| 2600 MHz | dBc | 42 | 45.17 | 40.3 | 45.48 | |
| 3500 MHz | dBc | 44 | 45.94 | 43.95 | 42.4 | |
| 4900 MHz | dBc | 46.1 | 39.62 | 39.3 | 39.12 | |
| 8100 MHz | dBc | 46.1 | 29.3 | 29 | 30.05 | |
| SFDR | For Fout ±250 MHz BW, DSA – 0 dB, –1 dBFS; | |||||
| 850 MHz | dBc | 68.5 | 72.64 | 72.09 | 72.92 | |
| 1800 MHz | dBc | 79.4 | 70.66 | 67.91 | 71.19 | |
| 2600 MHz | dBc | 77 | 71.3 | 68.3 | 68.96 | |
| 3500 MHz | dBc | 75 | 70.12 | 65.73 | 68.11 | |
| 4900 MHz | dBc | 76 | 67.44 | 62 | 62.67 | |
| 8100 MHz | dBc | 75 | 59.9 | 60.55 | 60.63 | |
| IMD3 | IMD3 for ±10 MHz tone offset, DSA – 0dB, –13 dBFS each tone | |||||
| 850 MHz ±10 MHz | dBc | –74.4 | –70.65 | –53.35 | –55.43 | |
| 1800 MHz ±10 MHz | dBc | –71.1 | –75.7 | –78.96 | –79.01 | |
| 2600 MHz ±10 MHz | dBc | –73 | –72.28 | –73.33 | –72.42 | |
| 3500 MHz ±10 MHz | dBc | –72 | –71.95 | –73.94 | –72.35 | |
| 4900 MHz ±10 MHz | dBc | –67.8 | –65.32 | –61.54 | –62.94 | |
| 8100 MHz ±10 MHz | dBc | –76.24 | –73.94 | –73.57 |