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 VCO transient analysis : Convergence Issues. 

Last post Tue, Oct 30 2012 12:09 AM by rsrk. 0 replies.
Started by rsrk 30 Oct 2012 12:09 AM. Topic has 0 replies and 949 views
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  • Tue, Oct 30 2012 12:09 AM

    • rsrk
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    • Joined on Thu, Feb 10 2011
    • Posts 9
    • Points 150
    VCO transient analysis : Convergence Issues. Reply

    Hi,

       I am facing convergence issues while doing transient analysis on a LC MOS cross-coupled oscillator.

    Figure of the NMOS-only cross-coupled oscillator is attached along.

    Spectre Version :  10.1.0.204

    As suggested by Andrew on this forum,  I am doing moderate analysis with integration method : traponly

    For inductors of value 1.59nH and Capacitors of value 15.9nF, oscillator is working fine(oscillating at 1MHz). When I change these values to 1.767nH and 17.67pF, it is throwing convergence errors as mentioned in the attached file. I will be glad if someone can help me to find the solution.

    Regards

    Sivaramakrishna R

     

    • Post Points: 5
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Started by rsrk at 30 Oct 2012 12:09 AM. Topic has 0 replies.