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 half harmonic frequency in PSS analysis 

Last post Thu, Apr 30 2009 10:29 AM by Andrew Beckett. 1 replies.
Started by Andy Liu 30 Apr 2009 08:34 AM. Topic has 1 replies.
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  • Thu, Apr 30 2009 8:34 AM

    • Andy Liu
    • Not Ranked
    • Joined on Thu, Apr 30 2009
    • Posts 4
    • Points 95
    half harmonic frequency in PSS analysis Reply
    I am designing an LC based voltage control oscillator. I want to simulate phase noise of my oscillator, but, I ALWAYS got a very bad phase noise performance (for example, -60 dBc/Hz @ 1 MHz offset, compared to my expectation -110 dBc/Hz). The reason is that in the periodic steady state analysis (PSS), the fundamental frequency is simulated wrong. I estimate the fundamental frequency is 5 GHz from the transient waveform, whilst the fundamental frequency given by PSS simulation is 2.5 GHz. Has anyone encountered or does anyone have any knowledge of this problem?

    I figure out a method to get around this half harmonic frequency problem. In the pnoise analysis, people usually choose “sweep type” as “relative”, and “relative harmonic” as 1. I wonder if I can choose “relative harmonic” as 2 to compensate the half harmonic in PSS simulation.
     
    Thank you.
    • Post Points: 20

  • Thu, Apr 30 2009 10:29 AM

    Re: half harmonic frequency in PSS analysis Reply

     I answered the same question over on the RF forum.

    Andrew.

    • Post Points: 5
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Started by Andy Liu at 30 Apr 2009 08:34 AM. Topic has 1 replies.