i measure the TX DC offset in difference TX attenuation setting, i found that it almost remain the same power -56dBm~-59dBm. But the IQ mismatch power will decrease when attenuation increase. why? Is there no TX DC offset tracking mechanism in AD9361?
i also see description in the <AD9361_Calibrations_v2.3> document, the TX monitor calibration has the TX DC offset calibration function too? or the TX DC offset calibration only contain in the TX QEC process? But the TX monitor calibration is unused default in driver.
how can i reduce the TX DC offset in difference attenuation step?
attachment is TX DC offset picture in three TX attenuation setting.