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    Sidelobes from Periodic AC (pac) Analysis

    Hi,

    Is it possible to get an ac transfer curve of a sampled system with all desired sidelobes? I did a pac analysis of SC filter with 20 sidebands and found the behavior like this. But I am interested on getting the side-lobes as like as seen in the textbooks.

    Click image for larger version. 

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    Please help.
    Your life is all about ΔΣ, the narrow you estimate it, the precise it is ...

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    Re: Sidelobes from Periodic AC (pac) Analysis

    Quote Originally Posted by ashrafsazid View Post
    Is it possible to get an ac transfer curve of a sampled system with all desired sidelobes?
    What do you want to mean by "sidelobes" ?



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    Re: Sidelobes from Periodic AC (pac) Analysis

    Quote Originally Posted by pancho_hideboo View Post
    What do you want to mean by "sidelobes" ?
    I meant Sidebands.
    Your life is all about ΔΣ, the narrow you estimate it, the precise it is ...



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    Re: Sidelobes from Periodic AC (pac) Analysis

    First of all, what simulator do you use ?

    Quote Originally Posted by ashrafsazid View Post
    I meant Sidebands.
    Even if you mean sidebands, I can not understand what you want to plot at all.

    Can you understand PAC(Periodic AC) Analysis ?

    I assume you use PSS/PAC Analysis of Cadence Spectre.

    Code:
    f(out)= f(in) + Ki * fund(pss)
    f(in) represent the (possibly swept) input frequency.
    fund(pss) represents the fundamental frequency used in the corresponding PSS analysis.
    Default of `freqaxis' is the absolute value of the output frequency(`absout').

    What plot do you want to expect ?

    Show me netlist fragments regarding PSS and PAC.



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