AD9361
Recommended for New Designs
The AD9361 is a high performance, highly integrated radio
frequency (RF) Agile Transceiverâ„¢ designed for use in 3G and
4G base station applications....
AD9361 on Analog.com
Hello, in the context of using an external LO (a signal generator in my case) with an fmcomms5, I am facing an issue related to the input power specification of the Inphi 13617CF (13 Gbps 1:2 Fanout).
According to the datasheet, the maximum input level driving the 13617CF is specified as 1 Vpp (≈ 4 dBm).
At 500 MHz, this condition is met and the signal is successfully generated at the output. However, as the frequency increases, the input power required to properly observe the signal at the output exceeds 4 dBm. For example, at 700 MHz, approximately 8 dBm is required.
Since my target operating frequency is on the order of 2 GHz, 8 dBm does not appear to be sufficient to faithfully reproduce the desired signal at the output. I am therefore hesitant to further increase the input power beyond the datasheet recommendation, but at the same time I am wondering whether this behavior could be explained by frequency-dependent losses or impedance mismatch, and whether increasing the input power beyond 8 dBm would be acceptable in practice in order to recover the expected signal at higher frequencies.
Could you please advise on whether this behavior is expected and how it should be handled?
Best
