Hi ad9361 experts:
When I used vivado to observe the rx signal, and found that I/Q signal was too large with peak clipping. As the picture below shows:
The value of the I/Q signal sometime is 0xffff, which reaches the peak. I am using FAGC. I tried to lower the overload threshold, but the problem still existed. And I changed gain control mode to MGC, and lower the gain, still not solved. Could you give me some advice?
Thanks a lot.
What is the input signal power that is fed at Rx port ?
If you are looping back Tx to Rx put 20 dB attenuation on Tx path and try.
Are you looping back tx to rx? Instead of looping back can you give a fixed amplitude tone at rx input, set the gain mode to fast attack and then see the Rx output.
Thanks for your help. This problem is due to my error ILA setting. The signal is OK. AD9361 works well. Thanks.
I am using just RX1
Thanks for your reply. I make tx1 attenuation even to 40dB, still not solved. I am using FAGC, I guess the ad9361 itself adjusts the gain to a very high value. But I dont know how to lower the gain it locks to. When I set tx1_attenuation to 20dB, the gain locks to 40dB. I even change the agc_inner_thresh_high to a lower value(-20dBFS), still not work. Is there anything that I missed?
Thanks a lot.
Besides, what does the normal I/Q signal look like? Thanks
Thanks for your reply. Forgive me for not answer your question. I am not looping back tx to rx. I inputed a fixed amplitude signal at rx input, and set the gain mode to fast attack. Still the Rx output peak clipping, any suggestion please? Thanks a lot.