Other Parts Discussed in Thread: LMX2594
Hi,
While testing of LMX2549EVM, i didn't get enough output power at higher frequencies. Please see the below table for your reference.
| Frequency (GHz) | Spectrum Input Power (dBm) | Cable + attenuator Loss | O/P Power@RF OUTAP (dBm) |
| 7 | 1.81 | 1.4 | 3.21 |
| 7.5 | 2.1 | 1.5 | 3.6 |
| 8 | 1.54 | 1.5 | 3.04 |
| 8.5 | 1.55 | 1.5 | 3.05 |
| 9 | 0.9 | 1.7 | 2.6 |
| 9.5 | 0.73 | 1.6 | 2.33 |
| 10 | -0.98 | 1.4 | 0.42 |
| 10.5 | -2.14 | 1.6 | -0.54 |
| 11 | -3.3 | 1.7 | -1.6 |
| 11.5 | -3.92 | 1.7 | -2.22 |
| 12 | -4.77 | 1.5 | -3.27 |
| 12.5 | -5.7 | 1.9 | -3.8 |
| 13 | -6.58 | 2 | -4.58 |
| 13.5 | -9.41 | 2 | -7.41 |
| 14 | -5.32 | 2 | -3.32 |
| 14.5 | -5.57 | 2 | -3.57 |
| 15 | -6.25 | 2.1 | -4.15 |
As per datasheet, at 15GHz i should able to get 2dBm. Can you please help me out?
Tell me how can i get to know whether PLL has lock or not, i mean any indication is there on GUI or EVM board?
Thanks & Regards,
Swarup.
