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    Broad band dsign of LNA best topology

    I want to design LNA from 12-18 GHz. I want to get s11 and s22 less than -10 dB. Which are the best topologies for obtaining broad band LNA from 12-18 GHz. Can you guide to obtain S11 and S22 less than -10 dB from 12 to 18 GHz.

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    Re: Broad band dsign of LNA best topology

    Cascode Configuration is most common one.


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    Re: Broad band dsign of LNA best topology

    Any other configuration for broad band matching will advice



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    Re: Broad band dsign of LNA best topology

    Check tunable matching networks.
    Do you need all 12-18 GHz band, or there are some particular frequency bands?


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    Re: Broad band dsign of LNA best topology

    Quote Originally Posted by Georgy.Moshkin View Post
    Check tunable matching networks.
    Do you need all 12-18 GHz band, or there are some particular frequency bands?
    Yes, I need broadband matching networks for 12 - 18 GHz



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    Re: Broad band dsign of LNA best topology

    Distributed Microwave Amplifiers are also very popular for wide-band applications.



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    Re: Broad band dsign of LNA best topology

    I want to design LNA from 12-18 GHz, and am using following circuit with source degenerated inductor. Once I follow this circuit and keep changing one or other components values ( Input matching C and L or Source degenerated inductance L or gate inductance L). For example, once I change feed back capacitance or source inductor or gate inductor or matching capacitor or inductor values. I am loosing one or two important parameters of LNA. Sometimes I loose Stability or input (S11) or output return(S22) losses or gain(S21) of LNA or NF.
    I am not getting all the desirable parameters (S11, S21,S22,S12, noise figure, stability) at a time. What should I do, can you advice



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    Re: Broad band dsign of LNA best topology

    Follow the Textbook of Thomas Lee..


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