Board Configuration - Analog Devices ADRV9001 User Manual

UG-1828 Preliminary Technical Data
resetLuts
To start DPD operation from a known state, user should reset LUTs. By setting resetLuts to be 1, it sets most polynomial terms to be 0 to
remove the pre-distortion at the beginning of DPD operation.
User could configure the DPD post initial calibration parameters through TES as shown in Figure 151.
Figure 151. Configuring DPD Post Initial Calibration Parameters Through TES

BOARD CONFIGURATION

Besides configuring the DPD pre initial calibration and post initial calibration parameters, user should also configure 2 other parameters
related to the board configuration. These 2 parameters are externalLoopbackPeakPower and externalLoopbackPathDelay, which should
be provided to ADRV9001 before performing initial calibrations.
externalLoopbackPeakPower
It indicates the peak power of ORx input signal loop backed from the Tx output. For DPD to achieve an optimal performance, the ideal
externalLoopbackPeakPower should be set about -18dBm with a tolerance of ±5dBm. User could adjust the peak power by utilizing an
external step attenuator after power amplifier.
externalLoopbackPathDelay
DPD requires the alignment of the Tx signal capture x(t) with the external loopback capture y(t). The externalLoopbackPathDelay
parameter provides user the capability to compensate for additional delays on the external loopback path from the ADRV9001 Tx output
to ORx input. User should measure this delay and provide it to ADRV9001 before initial calibration. The measured delay is then used to
compensate the delay between x(t) and y(t). This parameter is critical especially for wideband applications due to high sample rate. In
narrowband application, it is less critical so user could simply set it to be zero unless there is a larger than usual delay in the external
loopback path.
User could set these 2 configurations through TES as shown in Figure 152.
Figure 152. Configuring Board Configuration Related Parameters Through TES
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