• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 2677 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SNR in dB and dBc

Nicole Han
Intellectual 2230 points

Hi,

Some ADC datasheets provide SNR in dBc, while some in dB. what's the difference between them? Can we convert dBc to dBFS? if we can, how?

  • 0
    TI__Mastermind 23235 points

    Ms Han -

    Since dB is a relative value, it needs to be referenced to something.

    dBFS = dB calculation referenced to a full-scale signal
    dBc = dB calculation referenced to the carrier signal (fundamental signal usually).  The carrier fundamental is usually less than the full-scale value in this case.

    You can convert between the two if you know that absolute value of carrier magnitude.  For dBFS, you should be able to find the maximum full-scale signal in datasheets.  If you know the absolute magnitude of the carrier, you can convert dBc to dBFS by adding the difference between the carrier magnitude and full-scale magnitude. The following link may also help (reference about mid-way down the page)