Analog Devices ADRV9005 Reference Manual page 250

Reference Manual
DIGITAL PREDISTORTION (DPD)
9. Use the TES to measure the transmit gain to help determine the gain target. To do this, enable the "CLGC Loop Open" option under the
"Digital Pre-Distortion" tab in TES, as shown in
filtered gain" at the "Transmit" tab. Note: Apply a single pole filter to smooth the gain measurement, and set the filter coefficient (0<α<1), as
shown in Figure 229. The measurement is smoother when a bigger 'α' is used. By default, it is set as 0.75.
10. By determining the final gain target based on the "CLGC last gain" and "CLGC filtered gain" provided by the ADRV9001, configure "CLGC
Gain Target", as shown in the
target. Note: If the transmit attenuation is changed by anything else rather than the CLGC, factor the change in the gain target. To achieve
the most accurate gain control, compensate the gain variation of the external components and ORx data path components by adjusting the
gain target.
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Figure 229. Play a Tx modulated input signal and observe the "CLGC last gain" and "CLGC
Figure 229. After that, disable the "CLGC Loop Open" to close the loop to allow CLGC to achieve the gain
Figure 229. CLGC Configuration Parameters
ADRV9001
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