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Formula for ripple factor in filter circuits

  1. Jul 22, 2012 #1
    i have come across two different formulas for ripple factor:
    One is r= (Vrpp/Vdc), where Vdc is the dc voltage of the output and Vrpp is the peak to peak ripple voltage. My professor uses this formula and I have also seen it being used in basic electronics by Floyd
    Another one is r= Vrms/Vdc from electronics by boylestad. Are these correct?

    Is it possible to show that they are equivalent. Please help. Thanks in advance
  2. jcsd
  3. Jul 22, 2012 #2


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    Science Advisor

    They are not equivalent but Wikipedia shows them both as being used.


    So, it depends on your definition.

    Peak to peak is easier to use and RMS would be difficult because the waveform is not sinusoidal.
  4. Jul 23, 2012 #3
    Thanks for the reply.
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