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Homework Help: Rectifier Circuit, graph (output wave)

  1. Feb 18, 2010 #1
    1. The problem statement, all variables and given/known data
    Sketch the output waveform:

    http://img7.imageshack.us/img7/3774/recgraph.jpg [Broken]
    (The coloured lines I added myself)

    2. Relevant equations

    Nothing which applies, I think.

    3. The attempt at a solution

    The answer has already been provided. I just have a concept question.

    The full rectifier circuit is active only where the input voltage is 4 or greater (marked in blue). But why 4?

    Is it simply the sum of the 4 diode's threshold voltages (marked in red), that is, 1+1+1+1=4?

    But only 2 diodes are active at a time (at each peak or valley of the input wave), right? So, why isn't it 1+1=2 instead?

    Or am I on the wrong track entirely?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Feb 19, 2010 #2


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    Staff: Mentor

    I believe it should be 2V in the + direction and 2V in the - direction. Is there a chance that is where they got the 4? It still shoule be shown as +/-2V on the triangle wave, though, not +4V. Was that picture part of the solution, or an interpretation of a written answer?
    Last edited by a moderator: May 4, 2017
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