recently, we are using single tone to test AD9371 JESD output spectrum, the tone is located at +3.84MHz offset compared to 3.5GHz. After JESD interface output, we saw the image tone at -3.84MHz is quite large (seems only 8~10dB image rejection, gain imbalance ~=0.5dB, phase imbalance >30 degree) which is quite abnormal
i have asked my colleague whether he enables IQ calibration, and he mentions that with his understandings and local check, it had been enabled.
I think I need to take a look at this part, so can anyone point out the the most important parts or key configurations that I should double check to make sure that IQ calibration and QEC inside AD9371 are correctly enabled ??
besides, by checking the JESD output tone, I found that it seems the IRR is damaged mainly due to I / Q cosine and sine wave has large phase imbalance (phase imbalance >30 degree, far away from expected orthogonality), I am just wondering whether i missed something or certain configurations that leads to I / Q path has large delay difference ??