Query about AD6643's NSR

Hello, supporter

I use AD6643 as IF sampling ADC. Attached is the results when NSR enabled and disabled.

Not sure whether the results are correct...

The sampling rate is 125MSPS, while the analog input is 156.25MHz/+-12.5MHz.

Could you please help give some comments on the results?

Thanks in advance!



  • 0
    •  Analog Employees 
    on Oct 18, 2013 11:55 PM

    Hi Wayne,

    There will be a difference in the number of bits transitioning at lower input signal levels with and without NSR enabled.  Can you provide some more details on your test conditions (ie input amplitude, clock amplitude and what input sources you have)?  Also, can you provide an FFT of your results?  I am not sure I fully understand your issue here.  Can you help me to understand what your concern is?

    Thanks and regards,


  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:29 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin