Half Adders and Full Adders

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#1 21676607 28 Oct 2016 18:01

Kramer Morgan Kramer Morgan

Anonymous

Post #1
21676607 28 Oct 2016 18:01

I was just assigned a school project for engineering. The project entails me adding 3 3-digit binary numbers together to get an output (ex. 101 + 001 + 111). I don't have a huge understanding with electronics quite yet, but I know that half adders are used to add one bit binary numbers (i think). So all in all i'm just really confused on how to go about this with my limited knowledge and would love some expert advice. Thanks!
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#2 21676608 28 Oct 2016 18:59

Kevin Angelo Ma Kevin Angelo Ma

Anonymous

Post #2
21676608 28 Oct 2016 18:59

First of all, do you have any idea/ concept about logic circuits? Here is a good introduction to addition of binary numbers( https://courses.cs.vt.edu/csonline/NumberSyst...essons/AddingMultipleBinaryNumbers/index.html ).. Also, about logic circuits, it is important that you understand alot of things like the number system itself, writing boolean expressions and etc. A simple example would be like this , https://www.cs.umd.edu/class/sum2003/cmsc311/Notes/Comb/adder.html
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#3 21676609 28 Oct 2016 22:03

richard gabric richard gabric

Anonymous

Post #3
21676609 28 Oct 2016 22:03

http://www.circuitstoday.com/half-adder-and-full-adder
As you can see in the above link, the difference relates to how the carry bit is handled,
cheers,
Richard
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#4 21676610 28 Oct 2016 22:05

Kramer Morgan Kramer Morgan

Anonymous

Post #4
21676610 28 Oct 2016 22:05

I get the 4 bit adder concept however what confuses me is my teachers wants 3 bit inputs instead of 2 bit , so i'm not sure how to add another input
#5 21676611 28 Oct 2016 22:57

richard gabric richard gabric

Anonymous

Post #5
21676611 28 Oct 2016 22:57

you don't add them all simultaneously, add two first, take that result and add it to the third, a total of six adders, plus one to take care of the carry on the high order bit. Binary addition is commutative. In an exercise like this, the additional propagation delay is not going to matter,
cheers,
Richard
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