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AD9361 TX Path Delay Clarification

Question asked by jsusong on Jul 27, 2018
Latest reply on Jul 31, 2018 by Vinod

I noticed when measuring the time delay from IQ samples going to the AD9361 to the time RF  is present on the output port is approximately 16uS longer than expected.  See filter settings and waveform below.  I have read the other threads regarding AD9361 TX path delays and have not found an answer for such a large difference in delay.  What am I missing?

 

Base Band Sample Rate = 500KHz

 

TX FilterOrderInterpolation
FIR1284
HB1142
HB262
HB322
Calculated Latency34.188 us

Measured Latency

49.8uS

Difference

15.6uS

 

CH1: FB_CLK (CMOS Single Ended)

CH2: TX_DATA_0 (CMOS Single Ended)

A: RF Power

F: Frequency

9361 TX Path Delay

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