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How to turn off flicker noise in Spectre?

Jacki

Hello,

     I hear in eldo users can turn off flick noise in noise simulation. I don't know if there is the similar function in Cadence Spectre. I want to simulate the integrated noise for an opamp, but the integrated noise is too high. I think maybe the flicker noise disturbs, so I want to turn off it, and want to check how the result is if there is only thermal noise, is the integrated noise closed to KT/C?

    Thanks.  

Parents

  • You can do this by disabling the parameters in the models (could be done via an include file which used "alter" to turn off the noise parameters, I think - I've not tried - or definitely by editing the model files).

    You can also turn of the noise contributions for specific devices altogether on Simulation->Options->Analog (only recently added though, in the last year if my memory is correct).

    Also you can look at Results->Print->Noise Summary to see which noise contributors have an effect or are the biggest contributors to the noise - so you can see how much comes from flicker, how much from shot, how much from thermal etc.

    Not exactly what you're after - but may be an alternative. By all means contact Customer Support if you would like spectre enhanced to provide what you're asking for.

    BTW, I thought that Eldo allowed you to disable flicker noise for transient noise (which you can also do in spectre, if you don't specify noisefmin), but wasn't aware of this being possible for normal noise analysis - at least not without modifying the model parameters in a similar fashion to with spectre.

    Regards,

    Andrew.

Reply

  • You can do this by disabling the parameters in the models (could be done via an include file which used "alter" to turn off the noise parameters, I think - I've not tried - or definitely by editing the model files).

    You can also turn of the noise contributions for specific devices altogether on Simulation->Options->Analog (only recently added though, in the last year if my memory is correct).

    Also you can look at Results->Print->Noise Summary to see which noise contributors have an effect or are the biggest contributors to the noise - so you can see how much comes from flicker, how much from shot, how much from thermal etc.

    Not exactly what you're after - but may be an alternative. By all means contact Customer Support if you would like spectre enhanced to provide what you're asking for.

    BTW, I thought that Eldo allowed you to disable flicker noise for transient noise (which you can also do in spectre, if you don't specify noisefmin), but wasn't aware of this being possible for normal noise analysis - at least not without modifying the model parameters in a similar fashion to with spectre.

    Regards,

    Andrew.

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