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  1. #1
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    Mixer NF design in Cadence

    I have a question when try to estimate a mixer's NF.
    How dose Cadence spectre calculate the NF of a mixer?
    I mean, if we are designing a mixer with onchip input from an LNA, then the input impedance of the mixer surely won't be 50Ω.
    So, when calculate the NF, which needs a value of Rs, dose it use the Zin of the mixer?
    If not, what is the Rs?
    Thanks.

    •   Alt9th February 2006, 14:17

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  2. #2
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    Re: Mixer NF design in Cadence

    I think if you simulate only the mixer in Cadence, then u have to specify the source impedance properly. But if you simulate LNA and mixer as a whole, then it takes into account the intermediate impedance.



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