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Homework Help: CMOS gate for the logic function

  1. Apr 8, 2012 #1
    Hello. One of my friends told me that the logic function for (A.or.B).and.(C.or.D) is


    From a book, I know the P1, P2 , N1, N2 form a NAND. The same for P3, P4, N3, N4.
    And P5, P6, N5, N6 form a NOR.

    My question is, is this circuit the same as (A.or.B).and.(C.or.D) ?

    Thank you
  2. jcsd
  3. Apr 8, 2012 #2
    O/P of first stage(nand) = (A.B)* , second stage = (C.D)*
    and third stage(nor) = ( (A.B)* + (C.D)* )* = (A.B)** . (C.D)** = A.B.C.D
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