As I known from ug1295 the ADRV9008 hardware reference manul, DC calibration include RF and digital DC offset calibration. But I don't know exactely the procedure of the calibration, like if the radio is off during init calibration and tracking calibration. The reason why I want to know that is I want to know if the DC offset calibration is suitable in 5G with subcarrier at DC. Should I disable this DC offset calibration function or disable during tracking calibration.
Sorry we were responding (API's suggested) , thinking that this is a ADRV9026 query .
RF DC offset will not impact the useful signal , but base band DC offset can impact. If after init cals , you disable…
One thing you can do is to offset the LO by SCS/2 so that LO falls in between subcarriers and then shift this back on FPGA. For example for SCS of 30KHz shift LO by 15 KHz.
Thank you for your advice. I Think it's a good idea. So in your opinion the DC offset calibration is not suitable for 5G with DC subcarrier if we use drectly?
DC Offset cal will impact peak EVM for the subcarrier placed on DC. You can disable digital DC offser using API adi_adrv9025_DigDcOffsetEnableSet()
How about the RF DC offset cal?
Is the calibration mask bit D3 in the following table of ug1295 refer to RF or Digital offset Cal, or both?