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    ADS Simulation of Circuit -Help

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    I need some help to design this circuit in ADS and reproduce the corresponding S parameter graph. FET model is NE3210S01. I have tried multiple times but not getting the result. VDD =0.4 V. I_DD=30 ma.

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    Re: ADS Simulation of Circuit -Help

    Show what you have done so far and what your results are.



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    Re: ADS Simulation of Circuit -Help

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    Magnetless Non reciprocal Metamaterial.pdf

    My circuit is not giving me any meaningful result. I have attached the paper which I am trying to reproduce, simulate. Any suggestion will be very helpful.



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    Re: ADS Simulation of Circuit -Help

    For linear simulation use S-Parameter model (S2P) of that transistor for that operating point. Do not use the nonlinear model.

    Missing drain inductor, wrong width of bias line

    If you want to do nonlinear analysis, see ADS help. And check transistor model parameters. Also check your bias and DC operating point. Your 0.4V supply voltage looks wrong, there seems to be a misunderstanding bias voltage in the paper.
    Last edited by volker@muehlhaus; 13th December 2019 at 08:29.



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    Re: ADS Simulation of Circuit -Help

    Your Nonlinear model is not correct and this transistor is obsolete.
    If I were you, I use more recent part ( CE3512K2) for its equivalent and request nonlinear model from Modelithics.If you're a student, Modelithics will probably supply quite accurate model of this transistor so you will able to do your simulations in a certainty.



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    Re: ADS Simulation of Circuit -Help

    Quote Originally Posted by volker@muehlhaus View Post
    For linear simulation use S-Parameter model (S2P) of that transistor for that operating point. Do not use the nonlinear model.

    Missing drain inductor, wrong width of bias line

    If you want to do nonlinear analysis, see ADS help. And check transistor model parameters. Also check your bias and DC operating point. Your 0.4V supply voltage looks wrong, there seems to be a misunderstanding bias voltage in the paper.
    As I am new at ADS software, so my questions may seem line very beginner level.

    1. ADS doesn't have the S parameter model of this transistor probably. Any document or reference guideline for this kind of design would be helpful.
    2. How to find out what should be exact bias voltage, authors didn't reply.
    3. I am supposed to model this circuit and produce exact graph before simulating in different freq. Any suggestion or guideline would be very helpful.

    - - - Updated - - -

    Thanks for your reply. How to solve or fix my nonlinear design model? Yes, CE3512K2 can be an option. Any reference document or guideline for nonlinear modelling in ADS?

    Thanks



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    Re: ADS Simulation of Circuit -Help

    Quote Originally Posted by BigBoss View Post
    Your Nonlinear model is not correct and this transistor is obsolete.
    If I were you, I use more recent part ( CE3512K2) for its equivalent and request nonlinear model from Modelithics.If you're a student, Modelithics will probably supply quite accurate model of this transistor so you will able to do your simulations in a certainty.
    I have already requested to modelithics for this non linear model of this FET. Any reference document or guideline for this kind of circuit design woul be really helpful.



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    Re: ADS Simulation of Circuit -Help

    Quote Originally Posted by swadesh07 View Post
    1. ADS doesn't have the S parameter model of this transistor probably. Any document or reference guideline for this kind of design would be helpful.
    There are many examples included with ADS.
    Start with examples on S-parameter simulation (linear simulation, S-parameter models at one specific operating point, no bias or supply voltage required in simulation)

    Also search for "ads circuit design cookbook"

    Quote Originally Posted by swadesh07 View Post
    2. How to find out what should be exact bias voltage, authors didn't reply.
    Authors specify 30mA drain current, set the gate voltage as required for 30mA. Use voltage and current probe in ADS. There is also a DC curve tracer template in ADS.

    But that is for non-linear simulation. Make sure to understand linear (S-parameter) simulation where the S2P transistor model has built-in the response at one specific bias. We don't need bias or supply sources in linear simulation with "S-Paramter simulation" controller.

    Quote Originally Posted by swadesh07 View Post
    3. I am supposed to model this circuit and produce exact graph before simulating in different freq. Any suggestion or guideline would be very helpful.
    From 20 years experience in simulation: It often happens that published simulation results cannot be reproduced because some detail in the paper is wrong or missing (by mistake or on purpose).


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    Re: ADS Simulation of Circuit -Help

    Quote Originally Posted by volker@muehlhaus View Post
    There are many examples included with ADS.
    Start with examples on S-parameter simulation (linear simulation, S-parameter models at one specific operating point, no bias or supply voltage required in simulation)

    Also search for "ads circuit design cookbook"



    Authors specify 30mA drain current, set the gate voltage as required for 30mA. Use voltage and current probe in ADS. There is also a DC curve tracer template in ADS.

    But that is for non-linear simulation. Make sure to understand linear (S-parameter) simulation where the S2P transistor model has built-in the response at one specific bias. We don't need bias or supply sources in linear simulation with "S-Paramter simulation" controller.



    From 20 years experience in simulation: It often happens that published simulation results cannot be reproduced because some detail in the paper is wrong or missing (by mistake or on purpose).
    Thank you very much for your guidance and help. I will follow those steps and inform here my progress.



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    Re: ADS Simulation of Circuit -Help

    Hi,

    I communicated with Modelithics for the transistor model. But CEL model are not free and they have university offer for complete library which is costly for single user like me. I got below 2 papers for that transistor model in their website. How can I develop my required model from that paper values. Thanks in advance.

    https://www.modelithics.com/models/d..._datasheet.pdf
    https://www.modelithics.com/models/V...L/CE3512K2.pdf



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