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Thermal Noise spectrum of a resistor

kenambo

HI..


  Is it possible to view the thermal noise which is constant over the bandwidth can be seen or plotted visually in cadence virtuoso and can we measure the MOSFET's thermal noise by this manner .. If so it can also be seen visually?

Thanks.

Parents

  • There are model parameters on bsim4 and resistor and various other components that control the flicker noise - it's not unusual for a resistor to not have flicker noise modeled, but thermal noise you get by default.

    You can turn off the noise contributions for individual devices by using Simulator->Options->Analog, and on the Main tab at the bottom, there's a Noise Contribution on/off checkbox. If you select "off", you can then pick the components in your design that you don't want to produce any noise. There was another recent thread which talked about this (in fact more than one) - look for isnoisy, and noiseoff_inst etc.

    Regards,

    Andrew.

Reply

  • There are model parameters on bsim4 and resistor and various other components that control the flicker noise - it's not unusual for a resistor to not have flicker noise modeled, but thermal noise you get by default.

    You can turn off the noise contributions for individual devices by using Simulator->Options->Analog, and on the Main tab at the bottom, there's a Noise Contribution on/off checkbox. If you select "off", you can then pick the components in your design that you don't want to produce any noise. There was another recent thread which talked about this (in fact more than one) - look for isnoisy, and noiseoff_inst etc.

    Regards,

    Andrew.

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