Initalization Calibrations - Analog Devices AD9361 Reference Manual

AD9361 Reference Manual

INITALIZATION CALIBRATIONS

Initialization calibrations are calibrations that must be run each
time the AD9361 device is powered up or hard reset using the
RESETB pin. Several of the calibrations only need to run once
during initialization and do not re-run during operation.
Others are dependent on the carrier frequency, temperature, or
other parameters and need to run initially and when certain
events occur (such as changing the carrier frequency more than
100 MHz). As long as power is applied to the
the calibration results are stored, including while in the SLEEP
state.
Table 2. Automatic Calibration Sequence and Calibration Status
Calibration Sequence State[3:0]
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8
0x9
0xA to 0xF
AD9361 device,
Active Calibration
Calibration WAIT state
Calibrations done
Baseband DC offset calibration
RF Rx DC offset calibration
Tx1 quadrature calibration
Tx2 quadrature calibration
Rx1 quadrature calibration
Rx2 quadrature calibration
Tx monitor calibration (DC offset)
Rx GM\LNA gain step calibration
Flush states
Rev. A | Page 7 of 128
The six calibrations in the calibration control are part of a
calibration sequence state machine. After a calibration
completes, the bit that was set to initialize the calibration will
self clear. If more than one calibration is enabled in a single
register write, the calibrations will progress in a set order
controlled by a state machine in the AD9361. Table 2 shows the
sequence of calibrations. When the calibration sequence state
holds a value of 0x1, the calibrations are complete. Some
calibrations depend on the results of previously run
calibrations. The Rx baseband filter and Tx baseband filter
calibrations are not part of the calibration sequence state
machine, and should run only when all other calibrations are
not running.
UG-570