Noise contributions when using AD6645 in undersampling application.

I would like to calculate the noise expected when using an AD6645 in an undersampling application, to sample a signal at 180 MHz using a 55 MHz sample rate.

Could you tell me a reference that shows me the contributions to noise and the calculations needed to work out the total noise expected?

Thank you for your help.

Dave.



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[edited by: admin. at 2:34 PM (GMT -4) on 9 Aug 2018]
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  • 0
    •  Analog Employees 
    on Jan 27, 2012 12:11 AM

    Hi,

    If you are looking for specific performance of the AD6645 in at this analog input frequency, then you can find the expected performance in the product data sheet.  See page 4 for typical specifications, and see  the typical performance curves starting on page 10 for frequency sweeps, etc.

    You may also want to try our ADIsimADC models to simulate performance in your application.

    If you are looking for background on IF sampling, I recommend the online tutorials section on our website.  This one is about undersampling applications:

    http://www.analog.com/static/imported-files/seminars_webcasts/3689418379346Section5.pdf

    Good luck with your design, and let us know if you need any additional information

    Regards,

    David

Reply
  • 0
    •  Analog Employees 
    on Jan 27, 2012 12:11 AM

    Hi,

    If you are looking for specific performance of the AD6645 in at this analog input frequency, then you can find the expected performance in the product data sheet.  See page 4 for typical specifications, and see  the typical performance curves starting on page 10 for frequency sweeps, etc.

    You may also want to try our ADIsimADC models to simulate performance in your application.

    If you are looking for background on IF sampling, I recommend the online tutorials section on our website.  This one is about undersampling applications:

    http://www.analog.com/static/imported-files/seminars_webcasts/3689418379346Section5.pdf

    Good luck with your design, and let us know if you need any additional information

    Regards,

    David

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