ad9371 tx dc effect

Hi all :

I use  ad9371 to transmit NR waveform,but find a big dc tone which cause worse evm around DC while transmitting  DL data,

I use ad9371 linux driver provided from adi:

github.com/.../ad9371.c

The initial cal mask like:

initCalMask = phy->init_cal_mask |= 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 |RX_LO_DELAY| TX_QEC_INIT| TX_LO_LEAKAGE_INTERNAL;

How can I reduce the dc effect ?

Thanks a lot~



NO
[edited by: weiting1115 at 8:25 AM (GMT -4) on 29 Oct 2020]