ad9631 rx I/Q signal peak clipping

I am using just RX1

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.

Hi Vinod:

   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

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.

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 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.

Hi srimoyi:

  When I set parameter ctrl_outs_index to 0x0A, I found that the control output 1 is always high, which means that Rx FIR filter always overflows, even when there is no signal input into the ad9361. My RXFIRConfig/TXFIRConfig is as below:

AD9361_RXFIRConfig rx_fir_config = {
1, // rx
-6, // rx_gain
2, // rx_dec
{10,22,22,-8,-41,-40,0,26,
-4,-49,-32,34,49,-25,-78,-13,
86,55,-81,-108,45,150,15,-174,
-100,160,191,-102,-272,-4,318,148,
-306,-310,218,458,-50,-556,-188,563,
467,-448,-741,196,951,191,-1030,-679,
915,1211,-552,-1703,-96,2043,1052,-2095,
-2337,1666,4030,-377,-6498,-3087,12409,27546,
27546,12409,-3087,-6498,-377,4030,1666,-2337,
-2095,1052,2043,-96,-1703,-552,1211,915,
-679,-1030,191,951,196,-741,-448,467,
563,-188,-556,-50,458,218,-310,-306,
148,318,-4,-272,-102,191,160,-100,
-174,15,150,45,-108,-81,55,86,
-13,-78,-25,49,34,-32,-49,-4,
26,0,-40,-41,-8,22,22,10}, // rx_coef[128]
128, // rx_coef_size
{1280000000,320000000,160000000,80000000,40000000,20000000}, // rx_path_clks[6]
20172411 // rx_bandwidth
};

AD9361_TXFIRConfig tx_fir_config = {
1, // tx
0, // tx_gain
2, // tx_int
{-2,-9,-17,-16,-1,14,11,-11,
-21,1,29,17,-27,-38,12,56,
18,-61,-58,44,97,-1,-120,-65,
112,141,-60,-202,-37,224,163,-182,
-290,64,378,122,-384,-344,275,547,
-41,-666,-295,633,674,-401,-1004,-42,
1173,657,-1070,-1352,598,1983,305,-2354,
-1674,2211,3563,-1132,-6271,-2114,12592,26382,
26382,12592,-2114,-6271,-1132,3563,2211,-1674,
-2354,305,1983,598,-1352,-1070,657,1173,
-42,-1004,-401,674,633,-295,-666,-41,
547,275,-344,-384,122,378,64,-290,
-182,163,224,-37,-202,-60,141,112,
-65,-120,-1,97,44,-58,-61,18,
56,12,-38,-27,17,29,1,-21,
-11,11,14,-1,-16,-17,-9,-2}, // tx_coef[128]
128, // tx_coef_size
{1280000000,160000000,80000000,40000000,40000000,20000000}, // tx_path_clks[6]
19611989 // tx_bandwidth
};

Dose my setting affect the performance of ad9361 RX FIR? Or the peak clipping has no connection with these RXFIRConfig/TXFIRConfig?

Thanks

Thanks for your help. This problem is due to my error ILA setting. The signal is OK. AD9361 works well. Thanks.