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Transient flicker noise simulation

Masoud ensaf

Hi,

 I want to run a transient simulation in Spectre with flicker noise ON. I set both Fmin and Fmax values. I am interested in the noise in the first 100ns of the simulation but I noticed that I have to set the simulation stop time to 1/Fmin (which is a very long simulation time), in order to get the correct answer. The noise in the first 100ns is less if I set an stop time less than 1/Fmin. It seems that Spectre turns on the noise sources based on the stop time. I want to run my simulation only for the first 100ns that I am interested in. Does anyone know how I can get around this problem?

Thanks,

Masoud 

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  • Masoud,

    If you're only simulating for 100ns, that's only 1 cycle of 10MHz. So you're not really going to get any significant effect of any noise below 10MHz - which is presumably where the flicker noise dominates.

    That's why you really want the simulation stop time to be 1/Fmin - you have to be simulating for long enough to be able to observe the noise at a particular frequency.

    So by all means only run the simulation for 100ns, but you won't really get any flicker noise... then again, maybe your circuit is not going to be sensitive to flicker noise?

    What kind of circuit is it that you're simulating?

    Regards,

    Andrew.

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  • Masoud,

    If you're only simulating for 100ns, that's only 1 cycle of 10MHz. So you're not really going to get any significant effect of any noise below 10MHz - which is presumably where the flicker noise dominates.

    That's why you really want the simulation stop time to be 1/Fmin - you have to be simulating for long enough to be able to observe the noise at a particular frequency.

    So by all means only run the simulation for 100ns, but you won't really get any flicker noise... then again, maybe your circuit is not going to be sensitive to flicker noise?

    What kind of circuit is it that you're simulating?

    Regards,

    Andrew.

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