Dynamic Power Consumption

Discussion in 'Homework Help' started by d3ck, Apr 20, 2014.

1. d3ck Thread Starter New Member

Jul 14, 2013
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0
Hye, I have problem to understand the example of how to calculate dynamic power consumption from my class.

Here is the question

Where here is the suggested answer

Part where I did not understand:

How they relate P(A+B=1) = 1 - P(A.B=0 )
How they relate P(Y=0)= P(A+B=1) x P(C=1)

Thanks for the help

Last edited: Apr 20, 2014

Jul 14, 2013
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3. WBahn Moderator

Mar 31, 2012
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I'm not familiar with the notation your author is using here. Perhaps you could explain it (and in doing so there is actually a good chance that you will get struck by lightning and realize the answer to your own confusion -- happens a lot).

4. d3ck Thread Starter New Member

Jul 14, 2013
8
0
The question asking about dynamic power consumption of Y=(A+B).C

Where P(A=1) is probability of input A equal to 1[HIGH], that means if the input equal to 0[LOW] it is "1-0.2=0.8" probability to get that, and so on for input B and input C.

I know the formula is P=CL * (Probability of output transisition form 0 to 1) * VDD^2 * frequency.

I just did not get the relation as I mention in my previous post.