AnsweredAssumed Answered

why the received Q signal is always distorted?

Question asked by xiaoquan on Mar 12, 2018
Latest reply on Mar 13, 2018 by xiaoquan

Hi,

 

when I implement QPSK signal transmit-receive by ad9361, the result is out of my expectation. By ILA IP, the tx_signal and rx_signal are shown as follow,

it can be viewed that Q signal is distorted totally.

then from SDK, I use function ad9361_bist_loopback(ad9361_phy, 1)  to implement the loopback tx to rx in ad9361. the signals  are shown below,

Q signal is still not right. (ADI provided reference HDL design and no-OS platform are adopted)Can you help me?

 

thanks in advance,

xiao quan

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