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Homework Help: Schmitt Trigger

  1. May 13, 2008 #1
    1. The problem statement, all variables and given/known data
    Please see refer to the attached picture of a Schmitt Trigger. How can you derive a relationship between V_in, V_out and V_ref, given values of R1, R2, R3,R4 and V_cc?

    2. Relevant equations
    Golden Rules for an Op Amp, voltage divider equations, etc.

    3. The attempt at a solution
    I'm not sure where to start, any suggestions/hints would be appreciated.

    Attached Files:

  2. jcsd
  3. May 14, 2008 #2
    It would be helpful if you could post some of the equations you have started with. I will give you few hints:
    *Input voltage is applied at the inverting end.
    *Positive feedback is used.
    *Obtain the feedback factor from the potential divider arrangement.
    *Establish relationship between the feedback factor, ref. voltage and saturation voltage.
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