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RF DC Offset Calibration

Question asked by s.kannan on Feb 2, 2018
Latest reply on Feb 13, 2018 by Vinod

Do you have any documents listing what is happening at the RF DC Offset Calibration, and what is the algorithm it is using for updating and offset correction?

In reference manual UG-673, it is stated that ad9364 will calibrated the DC correction value for each and every gain index in a LUT, and just recall it during the operation. But if we see what the API ad9361_rf_dc_offset_calib is doing- it simply writes the registers 0xc185, 0x186, 0x187, 0x188, and 0x18B. So, I looked into register map manual UG-672 manual for knowing what these register represents, but the explanation provided for those registers are not understandable and it has nothing to do with explanation provided in reference manual UG-673, and it also doesn't have any reference to the LUT mentioned in UG-673.

I want to know how these values are set, whether by automatically or manually?

In one more thread, it is mentioned that RF DC offset is calibrated by writing the register 0x170 to 0x182. Is these values independent of LO frequency?

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