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Colpitts Oscillator output power simulation

Saman Mokhtabadamri

Hello everybody,

As you can find in the attached image, I am trying to simulate a Colpitts oscillator. However, using pss analysis it shows a high output power. 

My question is where is the problem of my structure or simulation setup?

Best,

Colpitts 10.38GHz

Power

Parents
  • JankoK

    Hi Saman,

    Not going into details... did you set tstab period properly? Force Run transient to yes, set tstab to something like 50 periods, check Detect Steady State and set saveinit to yes. You can then plot the signals during tstab and observe if steady state was reached and if everything seems ok... if not, perhaps you could try changing methods to gear2only (PSS Options -> Accuracy Tab). 

    Isn't this oscillator fairly linear? I think you should use hb/hbnoise instead...

    BR

    /Janko

Reply
  • JankoK

    Hi Saman,

    Not going into details... did you set tstab period properly? Force Run transient to yes, set tstab to something like 50 periods, check Detect Steady State and set saveinit to yes. You can then plot the signals during tstab and observe if steady state was reached and if everything seems ok... if not, perhaps you could try changing methods to gear2only (PSS Options -> Accuracy Tab). 

    Isn't this oscillator fairly linear? I think you should use hb/hbnoise instead...

    BR

    /Janko

Children
  • Saman Mokhtabadamri
    in reply to JankoK

    Dear Janko
    Thanks for your help 

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