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Homework Help: Pspice problem

  1. Jan 11, 2013 #1
    Hello , i need some help with pspice.
    i need to build a circuit with 3 entrances and 1 exit.
    that will provide "1" every time there is at least tow "1" in the entrances.

    x y z Z
    0 0 0 0
    0 0 1 0
    0 1 0 0
    0 1 1 1
    1 0 0 0
    1 0 1 1
    1 1 0 1
    1 1 1 1

    this is what i built and what i get..
    any suggestions?
    323Untitled.png
     
  2. jcsd
  3. Jan 11, 2013 #2
    Re: Pspice prob..

    With your table, I find the relation:


    [itex]
    Z=A\cdot\left ( B + C\right ) + B\cdot C
    [/itex]

    You should be able to build it with 4 gates.

    J.
     
  4. Jan 11, 2013 #3
    Re: Pspice prob..

    i need to built it with NAND gates only...
     
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