UG-570 AD9361 Reference Manual
| Page 72 of 128
Rx GM/LNA GAIN STEP CALIBRATION
The gain of the LNA and mixer stages inside the AD9361 varies
over temperature and frequency. This calibration is a onetime
factory calibration that measures the gain step error for the
LNA and mixer to reduce the error of the Rx RSSI measure-
ment. In the field, the BBP would write the error-corrected
expected gain steps into the AD9361 for the current frequency
used. This process will improve Rx RSSI accuracy and linearity.
Complete this procedure before calibrating the Rx RSSI. The Rx
GM/LNA gain step calibration is only necessary if using the Rx
RSSI feature, and more detail on this calibration can be found in
the Received Signal Strength Indicator (RSSI) section.
Tx POWER OUT VS. Tx ATTENUATION AND Tx
POWER OUT VS. CARRIER FREQUENCY
A factory calibration should be completed such that the output
power of the system is known. Depending on the linearity of
the RF components chosen, a single point calibration may be
sufficient. If higher accuracy is desired, a matrix of carrier
frequencies and AD9361 Tx attenuation points may be evalu-
ated to measure the Tx power output. This factory calibration
would prevent the output power from exceeding regulatory
limits. This calibration should also check for transmit mask
compliance and transmit emission limits (ACLR).
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