DPD status

Update Count always 0 . Did DPD run correctly?

From the DPD statistics, there seems to be stability error (13341-->0x341D) due to which the update count never increments. Are you testing at the target output power of the PA? Can you test at 3dB/ 6dB back-off from the target power and check if the update count increments.

https://wiki.analog.com/resources/eval/user-guides/adrv9029/dpd_error_troubleshooting

Taking your advice . Now I reduced the digitial signal to -5.008dBFS. but the Direct EVM: 13.9703% .

And the error code still shows (13341-->0x341D)

root@Q:/sys/kernel/debug/iio/iio:device2# cat tx0_advanced_dpd_status
ADRV9025 TX0 Advanced DPD Status
Basic Status:
Error Code: 13341
Percent Complete: 0%
Iteration Count: 214
Update Count: 0
Sync Status: 4
Model Table: 0

Power Statistics:
Mean TU Power: -15.311 dBFS
Peak TU Power: -5.008 dBFS
Mean TX Power: -15.311 dBFS
Peak TX Power: -5.008 dBFS
Mean ORx Power: -15.278 dBFS
Peak ORx Power: -4.625 dBFS

Error Metrics:
Direct EVM: 13.9703%
Indirect EVM: 13.9703%
Select Error: 3.2460%
Indirect Error: 2.9754%

Error Status:
Error Status 0: metrics_mask=0x01c0, action_mask=0x0001
Error Status 1: metrics_mask=0x0000, action_mask=0x0000
Persistent Error 0: metrics_mask=0x0000, action_mask=0x0000
Persistent Error 1: metrics_mask=0x0000, action_mask=0x0000
root@Q:/sys/kernel/debug/iio/iio:device2#

When I disable and reset DPD for a serval times. The DPD status shows:

(The tx and orx settings kept the same. only reset DPD )

Direct EVM: 3.1584%

Mean TX Power: -15.167 dBFS

Peak TX Power: 0.156 dBFS

How could this happen.

root@Q:/sys/kernel/debug/iio/iio:device2# cat tx0_advanced_dpd_status
ADRV9025 TX0 Advanced DPD Status
Basic Status:
Error Code: 13341
Percent Complete: 0%
Iteration Count: 697
Update Count: 0
Sync Status: 4
Model Table: 0

Power Statistics:
Mean TU Power: -15.215 dBFS
Peak TU Power: -5.673 dBFS
Mean TX Power: -15.167 dBFS
Peak TX Power: 0.156 dBFS
Mean ORx Power: -15.216 dBFS
Peak ORx Power: -5.639 dBFS

Error Metrics:
Direct EVM: 3.1584%
Indirect EVM: 20.3157%
Select Error: 6.0937%
Indirect Error: 5.5274%

Error Status:
Error Status 0: metrics_mask=0x0380, action_mask=0x0001
Error Status 1: metrics_mask=0x0080, action_mask=0x0000
Persistent Error 0: metrics_mask=0x0000, action_mask=0x0000
Persistent Error 1: metrics_mask=0x0000, action_mask=0x0000
root@Q:/sys/kernel/debug/iio/iio:device2#

I was asking you to reduce the PA output power. The Peak Tx power is going beyond 0dBFS. Peak TX Power: 0.156 dBFS which means the gain expansion is more and PA must be compressing a lot.

root@Q:/sys/kernel/debug/iio/iio:device2# cat tx0_advanced_dpd_status
ADRV9025 TX0 Advanced DPD Status
Basic Status:
Error Code: 0
Percent Complete: 0%
Iteration Count: 21
Update Count: 0
Sync Status: 4
Model Table: 0

Power Statistics:
Mean TU Power: -13.711 dBFS
Peak TU Power: -5.504 dBFS
Mean TX Power: -13.711 dBFS
Peak TX Power: -5.504 dBFS
Mean ORx Power: -19.716 dBFS
Peak ORx Power: -10.922 dBFS

Error Metrics:
Direct EVM: 9.1345%
Indirect EVM: 9.1345%
Select Error: 4.4056%
Indirect Error: 4.7809%

Error Status:
Error Status 0: metrics_mask=0x03c0, action_mask=0x0001
Error Status 1: metrics_mask=0x0000, action_mask=0x0000
Persistent Error 0: metrics_mask=0x0080, action_mask=0x0000
Persistent Error 1: metrics_mask=0x0000, action_mask=0x0000
root@Q:/sys/kernel/debug/iio/iio:device2#



This is my result: No matter how I adjust the tx-gain or orx-gain to keep the power at an appropriate level, the EVM result is just not right.

I have also read many posts about DPD stability, but none of them seem to solve my problem.

What is the Tx min average threshold and ORX min average threshold? It looks like the DPD is in unity gain mode.