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Homework Help: Static voltage transfer characteristics

  1. Jan 27, 2010 #1
    I know how to find the static voltage transfer characteristics (output low voltage, input low voltage etc) for one input gates like an inverter from the graph of Vout v Vin.
    My question is how do I apply this to gates with two inputs? These graphs have two curves by keeping one input constant and the fluctuating the other, and then vice versa.
    Would the worst-case low noise margin become the smaller input low voltage minus the larger out low voltage and the worst-case large noise margin become the smaller output high margin minus the smaller input high margin?
    Or would I find the noise margins as I would for one curve, and taking the smaller of the two?
     
  2. jcsd
  3. Jan 28, 2010 #2

    berkeman

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    Staff: Mentor

    I'm not understanding the question very well, but in general there is no interaction between multiple inputs on a gate.
     
  4. Jan 29, 2010 #3
    I was tasked with finding the worst case noise margins from two input characteristic curves and I think that in most practical cases it is the same as finding the noise margins for one curve. I thought that the noise margins may be measured as a combination of the two curves doesn't seem likely. I wasn't sure and I had a homework assigned with that question so I wanted to make sure, but I will check back once it is graded to make sure!
     
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