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  3. PSpice Modelling - .noise simulations for resistors

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PSpice Modelling - .noise simulations for resistors

Cristina95
Cristina95 over 1 year ago

Hello!

I want to add the flicker noise to the resistor model in order to view the voltage spectral density in the frequency range 1 Hz - 100 kHz using .NOISE Simulations

How can I add the flicker noise source to this component ?

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  • TechiEE12
    0 TechiEE12 over 1 year ago

    For a resistor flicker noise cannot be modeled. However you can calculate total noise by a resistor using NTOT(device_name). For example if your resistor is R1.

    You can add a trace in probe window as  NTOT(R1). 

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  • Cristina95
    0 Cristina95 over 1 year ago in reply to TechiEE12

    Ok, I understand. I have another question. If I have the mathematical expression for the voltage spectral density of the flicker noise of a component, namely: en = 2.58e-6/sqrt(f), where f is the frequency. How can I model the flicker noise using ABM blocks in order to access the .NOISE Simulation? Thank you for your disponibility! Slight smile. 

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  • TechiEE12
    0 TechiEE12 over 1 year ago in reply to Cristina95

    Using ABM blocks you may not be able to achieve .NOISE simulation as ABM would just evaluate the transfer function/ expression and deliver the output. If you want to see flicker noise of GaAsFET, diode, JFET, MOSFET, BJT models, these can be calculated NFID(device_name),
    NFIB(device_name) in a AC simulation.

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  • TechiEE12
    0 TechiEE12 over 1 year ago in reply to Cristina95

    Using ABM blocks you may not be able to achieve .NOISE simulation as ABM would just evaluate the transfer function/ expression and deliver the output. If you want to see flicker noise of GaAsFET, diode, JFET, MOSFET, BJT models, these can be calculated NFID(device_name),
    NFIB(device_name) in a AC simulation.

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  • Cristina95
    0 Cristina95 over 1 year ago in reply to TechiEE12

    Thanks for your suggestion. But in my case, I want to make the PSpice model for a sensor where I know the transfer function and its intrinsic noise. Both are experimentally measured and with these data I want to implement the PSpice model for this sensor. The transfer function was made using ABM blocks, but I don`t know to implement the noise model in order to access the .NOISE Simulation. Do you have a suggestion in this case? Thank you! 

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  • TechiEE12
    0 TechiEE12 over 1 year ago in reply to Cristina95

    You would not be able to simulate intrinsic noise using a ABM block. Noise analysis is not considered for ABM. 

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