Kirchoff's law Question

Discussion in 'Homework Help' started by Malsch, Apr 28, 2012.

  1. Malsch

    Thread Starter New Member

    Mar 19, 2011
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    Hi, I was trying to understand how the transfer function is derived from a sallen-key topology using this pdf on page 2: http://www.vyssotski.ch/BasicsOfInstrumentation/AnalysisOfTheSallen-KeyArchitecture.pdf

    He starts by using kirchoffs law to obtain equations at certain points. What i was wondering is, at equation 1, how does the author conclude to such results when kirchoffs law states that at a node, all the currents are equal to zero.

    Thanks
     
  2. Malsch

    Thread Starter New Member

    Mar 19, 2011
    23
    0
    Never mind. he is actually taking them equal to zero. sorry for the stupid question
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    1,097
    Look at those two figures.

    The first diagram show I Kirchhoff's law.

    [​IMG]


    Current entering the node must be equal the current that is leaving the node.

    And this diagram show II Kirchhoff Law

    [​IMG]
     
    Last edited: Dec 13, 2015
    panic mode likes this.
  4. panic mode

    Senior Member

    Oct 10, 2011
    1,318
    304
    nice pictures...
     
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