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  1. #1
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    Impedance Formula Calculation

    Hi all,

    i get stucked while try to calculate Zin reported in this design note.

    http://cds.linear.com/docs/Design%20Note/dn454fa.pdf

    Do you have some hints please?

    Thank you in advance.

    Best Regards

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  2. #2
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    Re: Impedance Formula Calculation

    Which bit are you stuck with? The formula may look complex but is pretty straightforward really - all the values should be known.

    Keith.



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  3. #3
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    Re: Impedance Formula Calculation

    Quote Originally Posted by keith1200rs View Post
    Which bit are you stuck with? The formula may look complex but is pretty straightforward really - all the values should be known.

    Keith.
    Sorry for my bad English and thanks for your reply.

    Yes you re right i have all the values for the formula so this is not a problem.

    But i want to find how the guys of Linear calculate/find the formula and from the circuit topology they shown in the article I can't understant how they retrieve the formula.

    Best regards
    Oscar



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  4. #4
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    Re: Impedance Formula Calculation

    Perhaps they have used a symbolic analysis program? Anyway, I am too lazy to derive the formula with pencil and paper.



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