How to config DPD on AD9375?

Donot post duplicate threads. Will be followed here:

https://ez.analog.com/microcontroller-no-os-drivers/f/q-a/164495/how-to-config-dpd-on-ad9375

HI srimoyi,

I have mistake once post this question in to that forum, then I received this answer:

"Moving to No-Os forum for comments on the DPD configuration"

Because I don't know delete that question, I have post again in this forum.

Thanks

Above plot  is 2 tone sine 3Mhz and 10Mhz is logged from RX receiver in case no DPD. (Tx output on board 1 is 2 tone sine signal  and log IQ on board 2 ). It could have harmonic but no have noises as case have dpd. I couldn't measure EVM. But why dpd make output tx be deteriorated ?

Not sure why you are measuring DPD performance with 2 tone signal. What is DPD status mykonosDpdStatus_t. 

You need to first find out Tx EVM after applying CFR No DPD . If CFR is based on hard clipping EVM & through put will deteriorate.

From the ACLR plot with DPD that you shared previously , ACLR is improving means , EVM should improve and this should not impact through put.

After applying CFR with no dpd, system run at mode custom waveform QAM64 work well with 100Mbps, So, I guess Tx EVM good.

With applying CFR with DPD, I veryfied DPDStatus every 1s. It return in order
dpdStatus.dpdErrorStatus: ,dpdStatus.dpdExtPathDelay, dpdStatus.dpdIterCount, dpdStatus.dpdMaxAdaptation, dpdStatus.dpdModelErrorPercent, dpdStatus.dpdTrackCount

DPDStatus: 0 0x740 0xC6 0x11D3 0x25 0xC6
DPDStatus: 0 0x740 0xCA 0x11D3 0x26 0xCA
DPDStatus: 0 0x740 0xCE 0x11D3 0x25 0xCE
DPDStatus: 0 0x740 0xD2 0x11D3 0x27 0xD2
DPDStatus: 0 0x740 0xD6 0x11D3 0x28 0xD6
DPDStatus: 0 0x740 0xDA 0x11D3 0x27 0xDA
DPDStatus: 0 0x740 0xDE 0x11D3 0x28 0xDE
DPDStatus: 0 0x740 0xE2 0x11D3 0x25 0xE2
DPDStatus: 0 0x740 0xE6 0x11D3 0x27 0xE6
DPDStatus: 0 0x740 0xF2 0x12CE 0x24 0xF2

Because after applying DPD, my system seems run not good as no have dpd. So i don't know how to do next. Although my system run at 20Mhz bandwidth, I still  measuring DPD performance with 2 tone signal  to can see spectrum clearly.

Can you give solution?

Without Tx output EVM plot with DPD its hard to say.

If you reduce the Tx power by 3 dB how is the performance with DPD ? 

Hi, In above test cases, I get status of mykonosVswrStatus and mykonosClgcStatus. I see both errorStatus and  trackCount return 0. Why trackCount = 0( Number of times clgc and vswr has successfull run since initialization calibration = 0)
)?. Is it affect to successfull of DPD?

CLGC and VSWR do not impact DPD. They are seperate cal. 

Your DPD iteration count is increasing , so set up required for DPD is correct. May be there is something wrong with CLGC configuration.

Hi Vinod,

In page 4 of ad9375 datasheet, specification of image rejection at 5500Mhz is 50dbm. But once I try with 3 tone signal 3Mhz, 6Mhz, 9Mhz on AD9375, It generate 3 image -3Mhz, -6Mhz, -9Mhz. and not pass specification.

How to decrease or filter 3 above image signal. How to configure AD9375 to decrease image signal?

Can you share screenshot of your measurement. Are you running QEC tracking calibration.?

With single tone , what is the level of image?

What is your application ? If its 4G/5G can you test with a 4G signal at offset and measure QEC performance with tracking cals enabled? 

Thanks

 I implement Calib DPD with:

trackingCalMask = TRACK_ORX1_QEC | TRACK_ORX2_QEC | TRACK_RX1_QEC |
                             TRACK_RX2_QEC | TRACK_TX1_QEC | TRACK_TX2_QEC | TRACK_TX1_LOL | TRACK_TX2_LOL;

 initCalMaskDpd =  TX_LO_LEAKAGE_EXTERNAL | DPD_INIT | CLGC_INIT | VSWR_INIT;

You say :"Your DPD iteration count is increasing , so set up required for DPD is correct. May be there is something wrong with CLGC configuration"

Maybe CLGC configuration not correct because I read  status of CLGC :

Both clgcStatus.errorStatus and  clgcStatus.trackCount return 0x00;

I configure Clgc by api:

    mykError = MYKONOS_configClgc(&mykDevice);
    if (mykError != MYKONOS_ERR_OK) {
        errorString = getMykonosErrorMessage(mykError);
//        goto error_11;
    }
 and clgcConfig default:

static mykonosClgcConfig_t clgcConfig =
{
    -2000,          /* (value = 100 * dB (valid range -32768 to 32767) - total gain and attenuation from Mykonos Tx1 output to ORx1 input in (dB * 100)*/
    -2000,          /* (value = 100 * dB (valid range -32768 to 32767) - total gain and attenuation from Mykonos Tx2 output to ORx2 input in (dB * 100)*/
    0,              /* (valid range 0 - 40dB), no default, depends on PA, Protects PA by making sure Tx1Atten is not reduced below the limit*/
    0,              /* (valid range 0 - 40dB), no default, depends on PA, Protects PA by making sure Tx2Atten is not reduced below the limit*/
    75,             /* valid range 1-100, default 75*/
    75,             /* valid range 1-100, default 45*/
    0,              /* 0= allow CLGC to run, but Tx1Atten will not be updated. User can still read back power measurements.  1=CLGC runs, and Tx1Atten automatically updated*/
    0,              /* 0= allow CLGC to run, but Tx2Atten will not be updated. User can still read back power measurements.  1=CLGC runs, and Tx2Atten automatically updated*/
    0,              /* 16th of an ORx sample (16=1sample), (default 0, valid -64 to 64)*/
    255,            /* Default 255 (-30dBFs=(20Log10(value/8192)), (valid range  1 to 8191)*/
    600,            /* Threshold for Tx1 in order to stop tracking, value = 100 * dB, default 6db then value = 600*/
    600,            /* Threshold for Tx2 in order to stop tracking, value = 100 * dB, default 6db then value = 600*/
    0,              /* Threshold feature enable for Tx1, 0 = disable, 1 = enable, default = 0*/
    0               /* Threshold feature enable for Tx1, 0 = disable, 1 = enable, default = 0*/
};

How to configure to run success CLGC ?

Your CLGC config looks fine.

Can you please share your complete sequence? (Including CLGC init and tracking)

Your CLGC config looks fine.

Can you please share your complete sequence? (Including CLGC init and tracking)

Thanks PVALAVAN for your reply.

When change frequency,I run DPD and CLGC calibration follow this sequence:

	/*************************************************************************/
	/*****            Enable DPD calibrations                            *****/
	/*************************************************************************/
	uint8_t				errorFlag = 0;
	uint8_t				errorCode = 0;
	uint32_t			initCalsCompleted;


	uint32_t trackingCalMask = TRACK_ORX1_QEC | TRACK_ORX2_QEC | TRACK_RX1_QEC |
							 TRACK_RX2_QEC | TRACK_TX1_QEC | TRACK_TX2_QEC | TRACK_TX1_LOL | TRACK_TX2_LOL;

	uint32_t initCalMaskDpd =  TX_LO_LEAKAGE_EXTERNAL | DPD_INIT | CLGC_INIT | VSWR_INIT;



	if ((mykError = MYKONOS_radioOff(&mykDevice)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why radioOn failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts(getMykonosErrorMessage(mykError));

	}

	if ((mykError = MYKONOS_setRfPllFrequency(&mykDevice, TX_PLL, u64TxFrq)) != MYKONOS_ERR_OK) {
		return MYKONOS_ERR_FAILED;
	}
	if ((mykError = MYKONOS_setRfPllFrequency(&mykDevice, RX_PLL, u64RxFrq)) != MYKONOS_ERR_OK)
	{
		return MYKONOS_ERR_FAILED;
	}
	Delay_Ms(100);


	// Make sure PA is ON
	if((mykError = MYKONOS_abortInitCals(&mykDevice, &initCalsCompleted)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts("abortInitCals failed");
		fflush(stdout);
		puts(getMykonosErrorMessage(mykError));
	}

	LREP("\r\n Mykonos ARM Initialization Calibrations for DPD");

	if ((mykError = MYKONOS_runInitCals(&mykDevice, initCalMaskDpd)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts("MYKONOS_runInitCals");
		fflush(stdout);
		puts(getMykonosErrorMessage(mykError));

	}

	if ((mykError = MYKONOS_waitInitCals(&mykDevice, 60000, &errorFlag, &errorCode)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts("MYKONOS_waitInitCals");
		fflush(stdout);
		puts(getMykonosErrorMessage(mykError));
	 }

	if ((mykError = MYKONOS_getEnabledTrackingCals(&mykDevice, &trackingCalMask)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts("MYKONOS_getEnabledTrackingCals");
		fflush(stdout);
		puts(getMykonosErrorMessage(mykError));
	}

	trackingCalMask |= TRACK_TX1_DPD | TRACK_TX2_DPD | TRACK_TX1_CLGC | TRACK_TX2_CLGC | TRACK_TX1_VSWR | TRACK_TX2_VSWR;

	if ((mykError = MYKONOS_enableTrackingCals(&mykDevice, trackingCalMask)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why enableTrackingCals failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts(getMykonosErrorMessage(mykError));
	}


	MYKONOS_radioOn(&mykDevice);

	/*** < Info: Allow TxQEC to run when User: is not actively using ORx receive path > ***/
	if ((mykError = MYKONOS_setObsRxPathSource(&mykDevice, OBS_RXOFF)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why setObsRxPathSource failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts(getMykonosErrorMessage(mykError));

	}
	if ((mykError = MYKONOS_setObsRxPathSource(&mykDevice, OBS_INTERNALCALS)) != MYKONOS_ERR_OK)
	{
		/*** < Info: errorString will contain log error string in order to debug why setObsRxPathSource failed > ***/
		//errorString = getMykonosErrorMessage(mykError);
		puts(getMykonosErrorMessage(mykError));

	}

	return MYKONOS_ERR_OK;

What is the Tx attenuation you are using to set the target power with CLGC? You should not use 0 dB attenuation, as CLGC need some headroom to track the target power by changing the Tx Attenuation.

Can you please print the complete status of CLGC?

typedef struct
{
uint32_t errorStatus;
uint32_t trackCount;
int32_t desiredGain;
int32_t currentGain;
uint32_t txGain;
int32_t txRms;
int32_t orxRms;
} mykonosClgcStatus_t;

You shall test CLGC by varying the ORX attenuation and see whether the Target power is maintained or not.

Please refer to the below post for reference,

https://ez.analog.com/wide-band-rf-transceivers/design-support-ad9371/f/q-a/163838/ad9357-clgc-custom-configuration-parameters

Thanks PVALAVAN, Vinod

Sorry, I have mistake when get CLGC status.

 I veryfied CLGCStatus again every 1s. It return in order
clgcStatus.errorStatus, clgcStatus.trackCount, clgcStatus.desiredGain, clgcStatus.currentGain, clgcStatus.txGain, clgcStatus.txRms, clgcStatus.orxRms

CLGCStatus: 9 27 -2000 -809 40 -1662 -2472
CLGCStatus: 9 29 -2000 -820 40 -1671 -2492
CLGCStatus: 9 30 -2000 -857 40 -1685 -2543
CLGCStatus: 9 32 -2000 -812 40 -1669 -2481
CLGCStatus: 9 34 -2000 -843 40 -1677 -2520
CLGCStatus: 9 35 -2000 -829 40 -1678 -2508
CLGCStatus: 9 38 -2000 -902 40 -1710 -2612
CLGCStatus: 9 43 -2000 -825 40 -1639 -2465
CLGCStatus: 9 45 -2000 -854 40 -1689 -2543
CLGCStatus: 9 47 -2000 -854 40 -1668 -2523

I check errorStatus = 9. Thats means: "

"

But in clgcConfig, i had enabled allowTx1AttenUpdates/allowTx2AttenUpdates

static mykonosClgcConfig_t clgcConfig =
{
    -2000,          /* (value = 100 * dB (valid range -32768 to 32767) - total gain and attenuation from Mykonos Tx1 output to ORx1 input in (dB * 100)*/
    -2000,          /* (value = 100 * dB (valid range -32768 to 32767) - total gain and attenuation from Mykonos Tx2 output to ORx2 input in (dB * 100)*/
    0,              /* (valid range 0 - 40dB), no default, depends on PA, Protects PA by making sure Tx1Atten is not reduced below the limit*/
    0,              /* (valid range 0 - 40dB), no default, depends on PA, Protects PA by making sure Tx2Atten is not reduced below the limit*/
    75,             /* valid range 1-100, default 75*/
    75,             /* valid range 1-100, default 45*/
    1,              /* 0= allow CLGC to run, but Tx1Atten will not be updated. User can still read back power measurements.  1=CLGC runs, and Tx1Atten automatically updated*/
    1,              /* 0= allow CLGC to run, but Tx2Atten will not be updated. User can still read back power measurements.  1=CLGC runs, and Tx2Atten automatically updated*/
    0,              /* 16th of an ORx sample (16=1sample), (default 0, valid -64 to 64)*/
    255,            /* Default 255 (-30dBFs=(20Log10(value/8192)), (valid range  1 to 8191)*/
    600,            /* Threshold for Tx1 in order to stop tracking, value = 100 * dB, default 6db then value = 600*/
    600,            /* Threshold for Tx2 in order to stop tracking, value = 100 * dB, default 6db then value = 600*/
    0,              /* Threshold feature enable for Tx1, 0 = disable, 1 = enable, default = 0*/
    0               /* Threshold feature enable for Tx1, 0 = disable, 1 = enable, default = 0*/
};

Can you give solution?

Thanks

I guess what you are seeing is correct. You need to enable allowTx1AttenUpdates/
allowTx2AttenUpdates. 

This thread has become too long. Can you start a new thread if CLGC issue is still not resolved.