How to Configure DPD correctly?

Question

Hello, 
 I have a ton of questions to ask about DPD configuration on the ADRV9025 chip. I am trying to configure DPD without the PA connected between the Tx-ORx path solely for testing purposes. I have gone through all the steps required in setting up DPD but there seems to be no signal in the ORx path. The dpdErrorCode I get shifts between 0x3405 and 0x340E. 
 My setup is as follows: 
 I am running a 2T-2R-2ORx setup utilizing TX3/TX2, RX3/RX2, and ORX3/ORX1. With this setup, I am running DPD on the TX2, connecting the output of the TX2 via a splitter to the ORX1 port and a spectrum analyzer (So as to monitor the TX2-ORX1 path). 
 
 For the DPD Tracking Cal Bring up Sequence, I followed the following steps. Note that I have supplied only the necessary snippets to avoid cluttering up this page: 
 1a. Program the device and run initial calibrations 
 1b. Run TxQEC initial calibration after chip initialization (for some reason, the programming failed when I tried to run the tx_qec init cal as part of the POSTMCS during initialization, see code snippet) 
 recoveryAct = adi_init_tx_cals_run( adrv9025Device, 
 ADI_ADRV9025_TX2, 
 ( ADI_ADRV9025_TX_QEC_INIT | ADI_ADRV9025_INTERNAL_PATH_DELAY | ADI_ADRV9025_TX_LO_LEAKAGE_INTERNAL ) 
 ) ; 
 
 2. Disabled ORX channels mapped TX2 to ORX1 and called the adi_adrv9025_RadioCtrlCfgSet function, setting all control modes to SPI (see code snippet) 
 printf("*** Disabling ORx Channels ***
") ;
recoveryAct = adi_adrv9025_RxTxEnableSet ( adrv9025Device, 0x06, 0x06 ) ;

rxChannelMaskGet = 0 ;
txChannelMaskGet = 0 ;
usleep(1) ;
recoveryAct = adi_adrv9025_RxTxEnableGet(adrv9025Device, &rxChannelMaskGet, &txChannelMaskGet) ;

recoveryAct = adi_adrv9025_TxToOrxMappingSet(device,ADI_ADRV9025_ORX1, ADI_ADRV9025_TX2);

adrv9025PostMcsInitInst.radioCtrlInit.radioCtrlModeCfg.orxRadioCtrlModeCfg.orxEnableMode = ADI_ADRV9025_ORX_EN_SPI_MODE; //ADI_ADRV9025_ORX_EN_SINGLE_CH_2PIN_MODE;
adrv9025PostMcsInitInst.radioCtrlInit.radioCtrlModeCfg.rxRadioCtrlModeCfg.rxEnableMode = ADI_ADRV9025_RX_EN_SPI_MODE ; //ADI_ADRV9025_RX_EN_PIN_MODE;
adrv9025PostMcsInitInst.radioCtrlInit.radioCtrlModeCfg.txRadioCtrlModeCfg.txEnableMode = ADI_ADRV9025_TX_EN_SPI_MODE ;//ADI_ADRV9025_TX_EN_PIN_MODE;
recoveryAct = adi_adrv9025_RadioCtrlCfgSet(adrv9025Device, &adrv9025PostMcsInitInst.radioCtrlInit.radioCtrlModeCfg);

3. Adjusted ORX1 gain, using gain index of 0xFF (see code snippet) 
 rx_gain.gainIndex = 0xFF ;
rx_gain.rxChannelMask = ADI_ADRV9025_ORX1 ;
 
recoveryAct = adi_adrv9025_RxGainSet (device, &rx_gain, 1);

4. Run the external path delay for TX2 (see code snippet) 
 adrv9025PostMcsInitInst.initCals.calMask = 0x00200000; //external path delay
adrv9025PostMcsInitInst.initCals.channelMask = ADI_ADRV9025_TX2 ;
adrv9025PostMcsInitInst.initCals.warmBoot = 0 ;
recoveryAct = adi_adrv9025_InitCalsRun(device, &adrv9025PostMcsInitInst.initCals);

recoveryAct = adi_adrv9025_InitCalsWait(device, 60000, &initCalsError);

5. Run the Tx external LOL init cals (see code snippet) 
 adrv9025PostMcsInitInst.initCals.calMask = 0x00000800; //external LOL
adrv9025PostMcsInitInst.initCals.channelMask = ADI_ADRV9025_TX2 ;
adrv9025PostMcsInitInst.initCals.warmBoot = 0 ;

recoveryAct = adi_adrv9025_InitCalsRun(device, &adrv9025PostMcsInitInst.initCals);

recoveryAct = adi_adrv9025_InitCalsWait(device, 60000, &initCalsError); 
 6. Configured the CFR settings (adi_adrv9025_CfrCtrlConfigSet, adi_adrv9025_CfrCorrectionPulseWrite_v2, adi_adrv9025_CfrEnableSet, adi_adrv9025_CfrHardClipperConfigSet, see code snippet) 
 7. Run the CFR Init Cals (with 60s wait time passed to the adi_adrv9025_InitCalsWait function) 
 8. Loaded the PA model (see code snippet) 
 dpdModelConfigInst.txChannelMask = ADI_ADRV9025_TX2 ; 
dpdModelConfigInst.dpdNumFeatures = 22;

char* dpd_model = "/media/sddata/defaultDpdModel.txt" ;
FILE *fp = fopen(dpd_model, "r");

for(int n = 0; n <dpdModelConfigInst.dpdNumFeatures ; n++)
{
 fscanf(fp, "%d %d %d %d %f %f",
 &dpdModelConfigInst.dpdFeatures[n].i,
 &dpdModelConfigInst.dpdFeatures[n].j,
 &dpdModelConfigInst.dpdFeatures[n].k,
 &dpdModelConfigInst.dpdFeatures[n].lut,
 &dpdModelConfigInst.dpdFeatures[n].coeffReal,
 &dpdModelConfigInst.dpdFeatures[n].coeffImaginary);
 
 printf("
%d %d %d %d %f %f
",
 dpdModelConfigInst.dpdFeatures[n].i,
 dpdModelConfigInst.dpdFeatures[n].j,
 dpdModelConfigInst.dpdFeatures[n].k,
 dpdModelConfigInst.dpdFeatures[n].lut,
 dpdModelConfigInst.dpdFeatures[n].coeffReal,
 dpdModelConfigInst.dpdFeatures[n].coeffImaginary);
}
adi_adrv9025_TxChannels_e tx_channels ;
fclose(fp);
recoveryAct = adi_adrv9025_DpdModelConfigSet(adrv9025Device, &dpdModelConfigInst); 
 --- My DPD MODEL --- 
 0 0 0 0 0 0
 0 0 1 0 0 0
 0 0 2 0 0 0
 0 0 3 0 0 0
 0 0 4 0 0 0
 0 0 5 0 0 0
 1 1 1 2 0 0
 1 1 2 2 0 0
 1 1 3 2 0 0
 1 1 4 2 0 0
 1 1 5 2 0 0
 0 1 0 8 0 0
 0 1 1 8 0 0
 0 1 2 8 0 0
 0 1 3 8 0 0
 0 1 4 8 0 0
 0 1 5 8 0 0
 2 2 1 26 0 0
 2 2 2 26 0 0
 2 2 3 26 0 0
 2 2 4 26 0 0
 2 2 5 26 0 0 
 
 9. Asserted DPD Reset (ADI_ADRV9025_DPD_RESET_FULL, see code snippet) 
 recoveryAct = adi_adrv9025_DpdReset(adrv9025Device, ADI_ADRV9025_TX2, ADI_ADRV9025_DPD_RESET_FULL);
if (recoveryAct != ADI_COMMON_ACT_NO_ACTION)
{
 printf("ERROR: : %s:%u has failed.
", __func__, __LINE__);
 return recoveryAct;
} 
 
 10. Run DPD Tracking configuration (see code snippet) 
 int32_t MThreshold_dBFS = -21; 
int16_t DpdLowPowerThreshold_dBFS = -36;
int16_t DpdLowPowerThresholdORx_dBFS = -36;

int32_t temp = pow(10,(MThreshold_dBFS/20.0))*FULL_SCALE_CODE;
int32_t dpdMThreshold_val = pow(temp,2);
int16_t minAvgSignalLevel_val = pow(10,(DpdLowPowerThreshold_dBFS/20.0))*FULL_SCALE_CODE;
int16_t minAvgSignalLevelOrx_val = pow(10,(DpdLowPowerThresholdORx_dBFS/20.0))*FULL_SCALE_CODE;

dpdTrackingConfigInst.txChannelMask = ADI_ADRV9025_TX2; 
dpdTrackingConfigInst.minAvgSignalLevel = minAvgSignalLevel_val;
dpdTrackingConfigInst.minAvgSignalLevelOrx = minAvgSignalLevelOrx_val;
dpdTrackingConfigInst.dpdMThreshold = temp ;
dpdTrackingConfigInst.dpdPeakSearchWindowSize = 65536;
dpdTrackingConfigInst.dpdIndirectRegularizationValue = 30;
dpdTrackingConfigInst.dpdDirectRegularizationValue = 30; 
dpdTrackingConfigInst.dpdSamples = 16384;
dpdTrackingConfigInst.dpdUpdateMode = ADI_ADRV9025_DPD_TRACKING_UPDATE_MODE_0;
dpdTrackingConfigInst.dpdIndirectRegularizationLowPowerValue = 20;
dpdTrackingConfigInst.dpdFilterSel = 0; 
dpdTrackingConfigInst.enableDirectLearning = 0;
dpdTrackingConfigInst.dpdMu = 50;

recoveryAct = adi_adrv9025_DpdTrackingConfigSet(adrv9025Device, &dpdTrackingConfigInst);

11. Setup closed-loop gain control configurations (for monitoring purposes. See code snippet) 
 adi_adrv9025_ClgcConfig_t clgc_config ;
clgc_config.clgcEnableGainControl = 0 ;
clgc_config.txChannelMask = ADI_ADRV9025_TX2 ;

recoveryAct = adrv9025_ClgcConfigSet( adrv9025Device, &clgc_config, 1) ; 
 
 12. Enabled TX QEC and TX LOL tracking Calibrations (See code snippet) 
 recoveryAct = adi_adrv9025_TrackingCalsEnableSet ( adrv9025Device, 
 ( ADI_ADRV9025_TRACK_TX2_QEC | ADI_ADRV9025_TRACK_TX2_LOL ), 
 ADI_ADRV9025_TRACKING_CAL_ENABLE
 ); 
 
 13. Enabled DPD Tracking Calibration (See code snippet) 
 adi_adrv9025_TrackingCalsEnableSet (device, ADI_ADRV9025_TRACK_TX2_DPD, ADI_ADRV9025_TRACKING_CAL_ENABLE); 
 
 14. Enabled CLGC Tracking Calibration (See code snippet) 
 recoveryAct = adi_adrv9025_TrackingCalsEnableSet ( adrv9025Device, 
 ADI_ADRV9025_TRACK_TX2_CLGC, 
 ADI_ADRV9025_TRACKING_CAL_ENABLE
 ); 
 
 15. Started monitoring DPD tracking calibration (See code snippet) 
 //Wait for some time before getting the status
sleep(20);


adi_adrv9025_DpdStatus_t dpdStatus;
int32_t recoveryAction = 0;
recoveryAction = adi_adrv9025_DpdStatusGet (device, txChannel, &dpdStatus);

printf ("dpdErrorCode :0x%x
",dpdStatus.dpdErrorCode);
printf ("dpdPercentComplete	:%d
",dpdStatus.dpdPercentComplete);
printf ("dpdPerformanceMetric	:%d
",dpdStatus.dpdPerformanceMetric);
printf ("dpdIterCount :%d
",dpdStatus.dpdIterCount);
printf ("dpdUpdateCount :%d
",dpdStatus.dpdUpdateCount);

printf ("dpdSyncStatus :%d
",dpdStatus.dpdSyncStatus);


float meanTu = dpdStatus.dpdStatistics.dpdMeanTuPower;
float peakTu = dpdStatus.dpdStatistics.dpdPeakTuPower;
float meanTx = dpdStatus.dpdStatistics.dpdMeanTxPower;
float peakTx = dpdStatus.dpdStatistics.dpdPeakTxPower;
float meanOrx = dpdStatus.dpdStatistics.dpdMeanOrxPower;
float peakOrx = dpdStatus.dpdStatistics.dpdPeakOrxPower;

printf ("dpdModelTable :%d
",dpdStatus.dpdModelTable);


printf ("dpdMeanTuPower :%f
",20*log10(sqrt(meanTu) / 32768));
printf ("dpdPeakTuPower :%f
",(20*log10(sqrt(peakTu) / 32768)));
printf ("dpdMeanTxPower :%f
",(20*log10(sqrt(meanTx) / 32768)));
printf ("dpdPeakTxPower :%f
",20*log10(sqrt(peakTx) / 32768));
printf ("dpdMeanOrxPower :%f
",20*log10(sqrt(meanOrx) / 32768));
printf ("dpdPeakOrxPower :%f
",20*log10(sqrt(peakOrx) / 32768));
printf ("dpdDirectEvm :%f
",dpdStatus.dpdStatistics.dpdDirectEvm);
printf ("dpdIndirectEvm :%f
",dpdStatus.dpdStatistics.dpdIndirectEvm);
printf ("dpdSelectError :%f
",dpdStatus.dpdStatistics.dpdSelectError);
printf ("dpdIndirectError	:%f
",dpdStatus.dpdStatistics.dpdIndirectError);
printf ("dpdErrorStatus0 (metrics:actions): X:X	:%d:%d
",	dpdStatus.dpdErrorStatus0.dpdMetricsMask,
 dpdStatus.dpdErrorStatus0.dpdActionMask);

printf ("dpdErrorStatus1 (metrics:actions) :%d:%d
", dpdStatus.dpdErrorStatus1.dpdMetricsMask,
 dpdStatus.dpdErrorStatus1.dpdActionMask);
printf ("dpdPersistentErrorStatus0 (metrics:actions)	:%d:%d
", dpdStatus.dpdPersistentErrorStatus0.dpdMetricsMask,
 dpdStatus.dpdPersistentErrorStatus0.dpdActionMask);
printf ("dpdPersistentErrorStatus1 (metrics:actions)	:%d:%d
", dpdStatus.dpdPersistentErrorStatus1.dpdMetricsMask,
 dpdStatus.dpdPersistentErrorStatus1.dpdActionMask);
printf ("reservedPM :%d
",dpdStatus.reservedPM);
printf ("reservedTP :%d
",dpdStatus.reservedTP);
printf ("reservedPR :%d
",dpdStatus.reservedPR);

16. Started monitoring CLGC status (See code snippet) 
 recoveryAct = adi_adrv9025_ClgcStatusGet( adrv9025Device ,
 ADI_ADRV9025_TX2,
 &clgc_status
 );

printf("******** CLGC Monitoring ****************
") ;
printf ("clgc_status.clgcLoopGain : %f
", clgc_status.clgcLoopGain) ;
printf ("clgc_status.clgcTxRmsPower : %f
", clgc_status.clgcTxRmsPower) ;
printf ("clgc_status.clgcOrxRmsPower : %f
", clgc_status.clgcOrxRmsPower) ;
printf ("clgc_status.activeTxAttenIndex : 0x%x
", clgc_status.activeTxAttenIndex) ;
printf ("clgc_status.activeOrxGainIndex : 0x%x
", clgc_status.activeOrxGainIndex) ; 
 
 ---- And, here's the output of the above code: ----- 
 *** Tx2 DPD Status *** 
 *************************************** 
 Retrieving DPD status 
 dpdErrorCode :0x3405 
 dpdPercentComplete :0 
 dpdPerformanceMetric :0 
 dpdIterCount :18 
 dpdUpdateCount :0 
 dpdSyncStatus :4 
 dpdModelTable :0 
 dpdMeanTuPower :-14.280720 
 dpdPeakTuPower :-3.605944 
 dpdMeanTxPower :-inf 
 dpdPeakTxPower :-inf 
 dpdMeanOrxPower :-58.033522 
 dpdPeakOrxPower :-49.337814 
 dpdDirectEvm :4.338248 
 dpdIndirectEvm :nan 
 dpdSelectError :0.000000 
 dpdIndirectError :0.000000 
 dpdErrorStatus0 (metrics:actions): X:X :0:0 
 dpdErrorStatus1 (metrics:actions) :0:0 
 dpdPersistentErrorStatus0 (metrics:actions) :0:0 
 dpdPersistentErrorStatus1 (metrics:actions) :0:0 
 reservedPM :0 
 reservedTP :40249683 
 reservedPR :40249683 
 *************************************** 
 
 *** Running Monitor CLGC tracking Calibration Status *** 
 ****** ** CLGC Monitoring ************** ** 
 clgc_status.clgcLoopGain : 0.000000 
 clgc_status.clgcTxRmsPower : 0.000000 
 clgc_status.clgcOrxRmsPower : 0.000000 
 clgc_status.activeTxAttenIndex : 0x0 
 clgc_status.activeOrxGainIndex : 0x0 
 
 ---------------- End of output ---------------------------- 
 
 I am not sure what I am doing wrong here. Could it be because I have not connected a PA yet?

AlexAntwi · Accepted Answer

Hello Ramarao 
 I think I solved the issue with the errors in the GUI. I am not sure, but there seems to be an error with the defaultDpdModel.txt file I was using (see my initial post for the dpd model) ; 
 According to the ADRV9026/ADRV9029 System Development USer Guide (Rev. PrA), sub-topic "GMP Model and Look Up Table, page 10, each row in the LUT bank shares the same cross term (j) values. The model file I was using does not follow this rule so I edited it and loaded it up again. No more GUI errors when I apply the M and C tables. 
 I used this same model for our custom board and, after loading the model in my code (before asserting ADI_ADRV9025_DPD_RESET_FULL), I asserted ADI_ADRV9025_DPD_LUT_RESTORE_C_TABLE and/or ADI_ADRV9025_DPD_LUT_RESTORE. And then finally asserted the full reset. With this sequence, the RF signal does not die off. However, this is, problem half solved. There's still one more thing; without any PA connected, I expect to see distortion in my RF signal, however, the signal stays the same (DPD ON or DPD OFF). I will keep testing from here onwards and update this post if there is any luck. But, I would really appreciate your thoughts, I may still probably be doing something wrong (and may be wrong about half-solving the error).)