# MOS Logic Circuits (PDN, PUN)

Discussion in 'Homework Help' started by jegues, Dec 12, 2011.

1. ### jegues Thread Starter Well-Known Member

Sep 13, 2010
735
43
Attached are the solutions to 2 problems from my text.

The problems simply as you to draw the PDN for the function given.

My usual strategy to doing this types of questions is to obtain,

$\bar{Y}$,

and draw the PDN by inspection.

The question circled in red has followed this method and implemented the PDN sucessfully.

The question circled in blue seems to have the PDN and PUN mixed up for the function given.

In other words,

$\bar{Y} = A + B(C + D)$

Is there a mistake in the blue solution or am I missing something?

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2. ### nyasha Active Member

Mar 23, 2009
90
1
I had a similar problem when l tried this question. They might have mixed them up.

3. ### jegues Thread Starter Well-Known Member

Sep 13, 2010
735
43
Still looking for clarification.

4. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
It could be a typo. Substituting Y with Y' in the original question makes it make sense.