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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 

Parents

  • Hi Andrew,

    Thank you for your reply,

    Actually, I am only interested in the variance of the Flicker noise and I wanted to find out if I can find the variance by running multiple short time simulations with multiple noise seeds instead of one long simulation.But it seems that it works only if I set the stop time to 1/Fmin. My test setup is one simple opamp. It seems that spectre turns on the noise sources based on the stop time. If I set the stop time to 1/Fmin, is there a way I can stop the simulation after 100ns? 

    Thanks,

    Masoud   

Reply

  • Hi Andrew,

    Thank you for your reply,

    Actually, I am only interested in the variance of the Flicker noise and I wanted to find out if I can find the variance by running multiple short time simulations with multiple noise seeds instead of one long simulation.But it seems that it works only if I set the stop time to 1/Fmin. My test setup is one simple opamp. It seems that spectre turns on the noise sources based on the stop time. If I set the stop time to 1/Fmin, is there a way I can stop the simulation after 100ns? 

    Thanks,

    Masoud   

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