need help with boolean algebra and switching algebra please

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MrDudeMan

MrDudeMan

Lifer
Jan 15, 2001
15,069
94
91
yes, it is a homework problem. no, im not looking for straight answers. no, its not a grade and yes im actually trying my best.

with that aside, here is the problem.

i cant figure out what to do with 2 input voltages. we havent learned how to do it and im pulling my hair out trying to figure it out.

can someone please explain this to me?

problem
 
D

dighn

Lifer
Aug 12, 2001
22,820
4
81
you don't have 2 + voltage sources. they are the same source connected together. just becuase they are seperated doesn't mean they are different sources. so you can draw a line connecting +v and +v if that makes it easier to see.


F = (Ab+Db)(BC + EF) -> invert signals because pmos is activated by 0

Fb = (Ab+Db)b + (BC+EF)b
=AD + (BC)b(EF)b = AD + (Bb+Cb)(Eb+Db)

if im right (not neceesarily) then you need to modify your ciruit slightly

btw Fb = Fbar = inverse of F
 
MrDudeMan

MrDudeMan

Lifer
Jan 15, 2001
15,069
94
91
Originally posted by: dighn
you don't have 2 + voltage sources. they are the same source connected together. just becuase they are seperated doesn't mean they are different sources. so you can draw a line connecting +v and +v if that makes it easier to see.


F = (Ab+Db)(BC + EF) -> invert signals because pmos is activated by 0

Fb = (Ab+Db)b + (BC+EF)b
=AD + (BC)b(EF)b = AD + (Bb+Cb)(Eb+Db)

if im right (not neceesarily) then you need to modify your ciruit slightly

btw Fb = Fbar = inverse of F
Click to expand...

:eek:^100000

i cant believe i didnt think of that

you = the man

btw, i knew you would show up, but what took you so long? ;)

thanks a ton

edit: i think your equations are slightly off, but it got me going on the right track and for that i am very grateful

edit2: ignore edit 1. i am still teh noob.
 
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