Building A Comparator Using Fs

Discussion in 'Homework Help' started by transgalactic, Apr 30, 2008.

  1. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
    74
    0
    i need to build a comparator
    of 2 numbers (each number has two bits)

    i think that we should subtruct them
    and if the last bit (sign bit) equals to one then the top number is smaller

    but here i get a totaly different solution
    i cant unerstand it:

    http://s290.photobucket.com/albums/ll279/t...nt=IMG_8812.jpg
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The conditions a comparitor has to output are greater than, equal to, or less than. If you let one value be A and the other B, then you device has to have one output true for A compared to B.
     
  3. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
    74
    0
    so i need to decide that by the least digit of their subtraction?????????

    cause i need to build it using "full subtractor " components

    and i cant understand the circuit of the solution
    which i presented in the first thread
     
  4. dogar sahab

    Active Member

    Mar 15, 2008
    116
    0
    I have to build a 8-bit comparator too using 4 bit comparator...
    what is the number of your IC??
     
  5. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
    74
    0
    466921864 my icq
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Transgalactic,

    Doghar is asking for the type of chip you have, the number printed on the IC package.
     
  7. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
    74
    0
    no
    i am solving theoretical questions
     
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