UG-1828 Preliminary Technical Data
Rev. PrC | Page 210 of 338
This parameters represents the filtered gain measurement results when loop is open (based on the filter coefficient user configured). User
could use API to retrieve this value which is in a accuracy of hundredth of a dB. Note this parameter is only valid for retrieving.
User could configure the DPD/CLGC post initial calibration parameters through TES as shown in Figure 194. Note all data capture
related configurations such as “Number of Samples”, “Rx/Tx Normalization” and “Activation” are also utilized by CLGC algorithm.
Figure 194. Configuring DPD/CLGC Post Initial Calibration Parameters Through TES
BOARD CONFIGURATION
Besides configuring the DPD/CLGC 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/CLGC 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/CLGC requires the alignment of the transmit 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 transmit 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 WB applications
due to high sample rate. In NB applications, 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 195.
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