We use 2 AD9361 devices in Rx Only mode. Both devices are fed by external PLL.
For some reason We observe a very strong LO signal at AD9361 outputs as can be observed on the attached pictures.
What can be the reason for such strong LO signal and how can it be removed?
Thanks in advance.
In RX only mode are you observing LO leakage at TX output ? How are you configuring RX only mode?
What frequency Tx and Rx LO's are configured.?
Are you using Custom board or Evaluation platform. ?
Please make sure that you are not sending any data through Tx . LO leakage cannot be So high .
We are using the ad9361 with custom board(microsemi FPGA). With No-OS drivers, we are just running
ad9361_init(&ad9361_phy, &default_init_param , (void*)handle); ad9361_set_tx_lo_freq ( ad9361_phy , 300000000);
After this If we probe the output spectrum, we are also facing the same issue(large LO leakage)
After this we tried generating BIST tone, still we don't get any BIST tone at output. We are only seeing the High power LO tone.
Did you find out any solution for this problem?
If you change frequency , is the LO changing. ?
Yes. When we change the frequency through set_tx_lo_freq() API, we are seeing the tone changing.
Please share init parameter structure.
is interface cmos/lvds?
How you enabled BIST tone?
For RX only how is the TX interface port of AD9361 is connected on board?
if it connected to FPGA then all the bits may be driving high which is why you see LO.