5 Transistor CMOS AND Gate

Discussion in 'Digital Circuit Design' started by Isaac Webb, Sep 23, 2016.

  1. Isaac Webb

    Thread Starter New Member

    Sep 23, 2016
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    I was getting curious in class and drew the following circuit. Is there a reason this circuit won't work as an AND gate? (if it does, it uses 1 less transistor than the standard AND gate!) The main issue I could see is that it draws current from A when it is on, but wouldn't that be fine in some circumstances?

    slice1.png
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    1,797
    For a single gate it might not be such a big deal. What happens if 1 million gates on a single die draw power from A? How about 10 million? How about 100 million? The big advantage of CMOS gates is that they draw almost no quiescent power when they are not switching.
     
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  3. crutschow

    Expert

    Mar 14, 2008
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    But you need transistors to generate the /B signal from the B signal.
     
  4. Isaac Webb

    Thread Starter New Member

    Sep 23, 2016
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    My circuit is a little misleading: 3 shown in the picture and 2 implied for the inverter is 5 total. It would be 3 assuming complemented inputs are available.
     
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