Stats

  • Locked Locked
  • Replies 1
  • Subscribers 125
  • Views 14065
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

SFDR in Cadence

black tea

Dear All,

I use the dft tool in cadence to test my wave, but I want to get the SFDR for 2GHZ wave, when i use the DFT tool in cadence, if I make the number of sample is 32768, then I can get the wave form for SFDR which I can see the 2GHZ(my in put frequency is 2Ghz), but when if I just pick 1024 samples, the SFDR stoped in 250Mhz.

Thanks a lot,

Kind Regards.

  • Andrew Beckett

    Not sure if you intended to have pictures in that post, but there weren't any - you have to attach them.

    Anyway, the frequency interval in a DFT is 1/interval where interval is the time interval you did the DFT over. You'll then end up with a maximum frequency of nSamples/2*fund where fund is the 1/interval. Not sure what your time interval was, but I suspect this is the problem.

    You could also use the spectrum assistant in ViVA (in the Measurements menu) to get SFDR and will give you more assistance as to how to fill in the parameters correctly.

    Regards,

    Andrew. 

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.