UG-1828 Preliminary Technical Data
Rev. PrC | Page 204 of 338
Figure 189. TES Configuration for Enabling DPD/CLGC Tracking Calibration
For DPD/CLGC to work, the profile must indicate that there exists an external loopback connection and an external PA for this channel.
This can be done by setting “Board Configurations” in TES properly, as shown in Figure 190.
Figure 190. TES Configuration for External Loopback with External Power Amplifier
amplifierType
Currently, the PA type should always be set to ADI_ADRV9001_DPD_AMPLIFIER_DEFAULT if DPD is enabled. The default PA type is
referring to both MOS and GaN type of PA. This field will be cleaned up in future releases.
lutSize
Currently, the supported LUT sizes are 256 and 512. This size determines the number of entries in the DPD LUT. A larger number of
entries provides better LUT granularity.
model
Currently, the model should be set to ADI_ADRV9001_DPD_MODEL_4 only. The other models exist for backwards compatibility with
other transceivers and should not be used at this time. Model 4 consists of four taps (T=4) which can be described by the following
equation:
3
0
( ) (| ( ) |) ( )
tt t
t
xn dn l dn k
ψ
=
= −−
∑
Delays for each tap are described in Table 82.
Table 82. Delays of DPD Model 4
Tap Delay of Data (k) Delay of Magnitude (l)
0 0 0
1 1 1
2 2 2
3 1 2
Based on Table 82, the equation could be rewritten as:
ψψ ψ ψ
= + − −+ − − + − −
3
() (| ()|)() (| ( 1)|)( 1) (| ( 2)|)( 2) ( ( 2))( 1)
01 2
xn dn dn dn dn dn dn dn dn
where ψ
0
(|d(n)|), ψ
1
(|d(n-1)|), ψ
2
(|d(n-2)|) and ψ
3
(|d(n-2)|) represent four taps, generated by the LUT.
DPD Model 4 tap configuration used to generate the final pre-distorted data x(t) is shown in Figure 191:
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