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Is there crosstalk between the I and Q path in AD9361

Question asked by xue on Mar 18, 2016
Latest reply on Apr 10, 2016 by xue

We found that there is crosstalk between the I and Q path in AD9361,

We use ad-fmcomms2 board. The tx LO and rx LO are set the same freqency 2.4GHz to do QPSK communication.

In the attachment crosstalk1.bmp,

the red solid line is tx's I path digital baseband singnal,

the green solid line is tx's Q path digital baseband singnal,

the red dash line is rx's I path digital baseband singnal,

the green dash line is rx's Q path digital baseband singnal,

we delay the tx signal to trim up the tx and the rx.

From crosstalk1.bmp, we can find the red dash line is impacted by the green dash line.

Actually, when one signal is at posedge or negedge there is always impact on the other signal. 

How to resolve the problem?

 

cxm126@163.com

2016/03/18

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