Home
  • Products
  • Solutions
  • Support
  • Company
  • Products
  • Solutions
  • Support
  • Company
Community Forums Custom IC Design How to remove components from the frequency spectrum

Stats

  • Replies 2
  • Subscribers 123
  • Views 524
  • Members are here 0

How to remove components from the frequency spectrum

Svilen64
Svilen64 1 month ago

Hi,

I have a signal and its spectrum and I would like to run dft and sndr/sfdr on it. However, I have a few spurs in the spectrum and would like to run the spectral analysis removing those spurs. Can I generate a new spectrum from the existing one but without the spurs or find sndr not taking them  into considerations? I know how to do it in Matlab, but have no clue how to do the same in spectre.

Thanks

Svilen

  • Reply
  • Cancel
  • Cancel
  • ShawnLogan
    ShawnLogan 1 month ago

    Dear Svilen,

    Svilen64 said:
    However, I have a few spurs in the spectrum and would like to run the spectral analysis removing those spurs. Can I generate a new spectrum from the existing one but without the spurs or find sndr not taking them  into considerations?

    I have an ocean procedure that will remove spurious tones from a spectrum and both plot and print the resulting spur-removed spectrum to a file. This routine is not adaptive in that the spur threshold is set in the calling line. (I have a far more complex program that has among its features an adaptive spur removal.) The ocean script can be run from the CIW or from within a larger ocean script. It returns the rms value of the spur-removed spectrum.

    This would enable you to compute an SNR using the spur-removed spectrum in ViVA or using the text file it creates of the spur removed spectrum.

    I can provide you this routine and an example if this is something you might have an interest Svilen64.

    Shawn

    • Cancel
    • Up 0 Down
    • Reply
    • Cancel
  • Andrew Beckett
    Andrew Beckett 1 month ago in reply to ShawnLogan

    I also have a function which takes a spectrum and gives you a new spectrum with some of the tones removed. It works by you specifying a fundamental frequency that you want to eliminate and the number of "bins" either side that you want to remove from each multiple. It was rather specific to a request from one customer so I'm not sure whether it will solve your problem.

    The key is to understand any pattern for the spurs you're trying remove. Is there a way of consistently describing them somehow? I'm sure my code could be adapted, but rather than posting it here I'd sooner understand exactly what you're looking for.

    Thanks,

    Andrew

    • Cancel
    • Up 0 Down
    • Reply
    • Cancel

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.

© 2023 Cadence Design Systems, Inc. All Rights Reserved.

  • Terms of Use
  • Privacy
  • Cookie Policy
  • US Trademarks
  • Do Not Sell or Share My Personal Information