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22nd October 2010, 14:33 #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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22nd October 2010, 15:51 #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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25th October 2010, 08:55 #3
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Re: Impedance Formula Calculation
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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25th October 2010, 09:34 #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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