Why DC analysis doesn't converge

Discussion in 'Cadence' started by Allen, Dec 3, 2007.

  1. Allen

    Allen Guest

    Can anyone give me some advice on my dc analysis? I am designing a
    digital PLL, when I run dc analysis for the charge pump circuit,
    cadence tells me that error is found because the step size is too
    large and it doesn't converge.

    Thanks.
    Best,
    Allen
     
    Allen, Dec 3, 2007
    #1
  2. Allen

    salim j athfal Guest

    Normally convergence problems for step size comes for transient
    analysis. Try to find out the exact point of non convergence from the
    output log file and read the your simulator ( specter /hspice) manual
    to fix the nonconvegence. This can done by changing some of the
    simulator options(band aid soultion) or putting some impedence at
    exact point of non-covergence.
    please refer http://www.ecircuitcenter.com/SpiceTopics/Non-Linear Analysis/Non-Linear Analysis.htm.
     
    salim j athfal, Dec 10, 2007
    #2
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads

  1. Any idea why this doesn't work in 2005??

  2. Why doesn't (command "_open") work?

  3. How to get dc operating point data from a swept dc analysis or aparametric dc analysis in ocean

  4. Why why why, virtuso LSW can't change layer

  5. Why AC analysis result doesn't agree with the transient result

  6. DC analysis gain differs from AC analysis gain

  7. Why Why Why .......

  8. %%U - Why doesn't it work?

Loading...