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FMCOMMS1 Loopback Latency Measurement

Question asked by Muhammet on Jul 29, 2015
Latest reply on Aug 16, 2015 by Muhammet



I am using FMCOMMS1 with KC705 carrier board. For my design, it is critical to find the loopback delay. I sent a sinc signal to find out the latency in terms of cycles. Here is the snapshot from chipscope.

In the above, The received signal (top 2 signals) has negative I, positive Q values. And The signs of the received IQ signals differ time to time. The latency between sent and received signals also changes. It is not constant.


Why does the latency change time to time?

Why does the received signal change time to time?