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AD9371 RX Framer IQ signal

Question asked by @MTU on Dec 7, 2017
Latest reply on Dec 8, 2017 by sripad

 

The software was No-OS, and I created the original board.


I saw the attached image, but the Q_DATA side level of Rx Framer is abnormally small.

(The top of the image is I and the bottom is Q.)
I am confirming that the RF input is correct data.


Do you know what the cause is?

 

IQ_SIGNAL2.png is the waveform when it gets out normally once every several hundred times.

 

From initCalMask, trackingCalMask of headless.c
When commenting out RX_QEC, normal waveform is output.
why?

 

headless.c

 uint32_t initCalMask =
                        TX_BB_FILTER            |
                        ADC_TUNER               |
                        TIA_3DB_CORNER          |
                        DC_OFFSET               |
                        TX_ATTENUATION_DELAY    |
                        RX_GAIN_DELAY           |
                        FLASH_CAL               |
                        PATH_DELAY              ;
//                         LOOPBACK_RX_LO_DELAY    |
//                         LOOPBACK_RX_RX_QEC_INIT |
//                        TX_LO_LEAKAGE_INTERNAL  |
//                        TX_QEC_INIT             |
//                        RX_LO_DELAY             |
//                        RX_QEC_INIT
//                        ;

 uint32_t trackingCalMask =
                       0x00000000         ;
//                       TRACK_RX1_QEC      |
//                             TRACK_TX1_LOL      |
//                             TRACK_TX1_QEC      |
//                             TRACK_ORX1_QEC     |
//                             TRACK_ORX2_QEC
// ;

 

 

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