• Skip to main content
  • Skip to search
  • Skip to footer
Cadence Home
  • This search text may be transcribed, used, stored, or accessed by our third-party service providers per our Cookie Policy and Privacy Policy.

  1. Community Forums
  2. RF Design
  3. Question about DC convergence error in sweep simulation...

Stats

  • Locked Locked
  • Replies 12
  • Subscribers 63
  • Views 18418
  • 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

Question about DC convergence error in sweep simulation.

dskang
dskang over 4 years ago

Hello, thank you in advance for your assistance.

I was making simple op-amp, but I used verilog-a based mosfet model (MIT-VS model).

To see DC operating point, I did DC simulation, and it seemed like the values settled on wrong point. (Results were not reasonable.)

However, when I did sweep simulation (sweep variable was temperature, which should be almost non-relative to the results), I found DC convergence result goes to correctly as simulations goes on. - This is also weird and I couldn't understand.

However, as dcOp still gives not reasonable values, so I cannot do other simulations like measuring AC gain.

I've already used nodeset, but it didn't worked.

Could anyone give me the solution how to apply dcOp to points that were gathered through sweep simulation, or to get appropriate DC results from the beginning?

Thank you so much

Best,

Dongsuk

  • Cancel
  • dskang
    dskang over 4 years ago in reply to ShawnLogan

    Dear Shawn,

    Thank you for answering my question. Now I understand some degree how to handle this problem. It's lucky that I could find solution, even it is not 100% orthodox - like fixing code.

    Your advice helped me a lot. Thank you again:)

    Regards,

    Dongsuk

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
  • ShawnLogan
    ShawnLogan over 4 years ago in reply to dskang

    Dear Dongsuk,

    You are most welcome - but I am just happy to read that you have a better understanding and have some time of solution to your problem! Thank you for letting Andrew and I know!

    Shawn

    • Cancel
    • Vote Up 0 Vote Down
    • 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.

© 2025 Cadence Design Systems, Inc. All Rights Reserved.

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