zener diode in series

Discussion in 'Homework Help' started by stones, Oct 12, 2015.

  1. stones

    Thread Starter New Member

    Aug 15, 2015
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    If two Zener diodes are connected in series and if there is an ac input voltage ,how varies the output voltage ?
     
  2. crutschow

    Expert

    Mar 14, 2008
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    Show us the circuit.
     
  3. stones

    Thread Starter New Member

    Aug 15, 2015
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  4. pwdixon

    Member

    Oct 11, 2012
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    You should get a limited sinewave with the limits at +(5.1V+0.7V) and -(3.3V+0.7V), roughly.
     
  5. WBahn

    Moderator

    Mar 31, 2012
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    What you need to do (other than just parroting some answer to your homework) is develop the DC transfer characteristic for the circuit. To do this, you need to consider what the output voltage is for different states of the two diodes.
     
  6. crutschow

    Expert

    Mar 14, 2008
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    To add to WBahn's post, look at what the voltage is across the two diodes as the input voltage changes over the input voltage range and then what the diodes do as the voltage goes above and below the zener voltages.

    Note that one diode is always reverse biased while the other is forward biased and that a zener diode in the forward direction looks like a normal diode
     
  7. crutschow

    Expert

    Mar 14, 2008
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    This is a Homework Help section not a Homework Do.
    It's preferred that we let the op try to solve the problem with hints from us rather than giving him the answer. :)
     
  8. pwdixon

    Member

    Oct 11, 2012
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    Sorry.
    I must admit I expected the OP to come back with something like "what are those voltages?" Also must admit I forgot it was the homework forum.
     
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