Stats

  • Locked Locked
  • Replies 3
  • Subscribers 126
  • Views 14724
  • 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

how to simulate device noise when the circuit has chopping block

kunmingcai

Dear All:

I want to get the noise performance of a block. the block including an opam and a common mode regulator which is chopping operation(the only clock in this block).

How can i run simulation to get the device noise.

it seems that pss+pnoise can do this. but my simulation do not comply with chip test result.

maybe there is some setting issue when run the simulation. could anyone tell me how to set up the simulation?

now i am setting the beat frequency the chopping frequency,what about the harmonic number?

 do i need to care about some other settings?

Thanks for any share.

  • Quek

    Hi Kunming

    Would you please let us know the specific version of spectre which you are using?

    Terminal>spectre -W

    (Output should be similar to "11.1.0.281.isr4")

    It might be good to retry using latest version of spectre in case you are experiencing a bug which affects the pss+noise results.

    Best regards
    Quek

  • kunmingcai
    Hi, Quek:
    Thanks for your reply.
    my version is:
    /tools/cadence>spectre -W
    sub-version  10.1.1.128.isr9

    Best Regards!
    Kunming
  • Andrew Beckett

    A good place to start would be to read Simulating switched-capacitor filters with SpectreRF . There is also a new option in MMSIM11.1 called "full spectrum" on the pnoise form which makes it much easier to ensure you have sufficient sidebands.

    Once you've reviewed the above, if you're still not getting meaningful results, you should contact Cadence Customer Support.

    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.