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Stop Time in Transient Analysis

Hadi Hayati

Hi

I have designed an oscillator which its center frequency is 2GHz and there seems to be a problem with its stop time I guess...

When I choose stop time for example 50ns, the oscillator works well and I can see the output waveforms. And if stop time is greater than 50ns (0.5us for example), then all I have at outputs is a straight line... There is no signal.

Anybody can help me out with this?

 

Regards,

Hadi

 

Parents

  •  Dear Hadi,

     > Why should we enable conservative in errpreste?

    As Tawna and I mentioned, the use of an errpreset setting of "conservative" reduces the values of a number of simulation variables relative to the settings "moderate" and "conservative". In essence, this forces the simulator to further iterate on a solution to reduce its error from the desired solution.

    In an oscillator application, the use of an errpreset of "conservative" will result in a more accurate estimate of oscillation frequency than, for example, an errpreset setting of "moderate". However, the simulation times will be increased. The need to choose an errpreset of "conservative" is dependent on your need for the accuracy of the frequency estimate.

     I'm sure others will have valuable  thoughts and opinions.

    Shawn

Reply

  •  Dear Hadi,

     > Why should we enable conservative in errpreste?

    As Tawna and I mentioned, the use of an errpreset setting of "conservative" reduces the values of a number of simulation variables relative to the settings "moderate" and "conservative". In essence, this forces the simulator to further iterate on a solution to reduce its error from the desired solution.

    In an oscillator application, the use of an errpreset of "conservative" will result in a more accurate estimate of oscillation frequency than, for example, an errpreset setting of "moderate". However, the simulation times will be increased. The need to choose an errpreset of "conservative" is dependent on your need for the accuracy of the frequency estimate.

     I'm sure others will have valuable  thoughts and opinions.

    Shawn

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