Adder (electronics) - Wikipedia, the free encyclopedia
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In electronics, an adder or summer is a digital circuit that performs addition of numbers. In modern computers adders reside in the arithmetic logic unit (ALU) where other operations are performed...
en.wikipedia.org/wiki/Adder_(electronics)
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What this suggests is also intuitively logical: we can use two half-adder circuits. The first will add A and B to produce a partial Sum, while the second will add CIN to that Sum to produce the final S output. If either half-adder produces a carry, there will be an output carry.
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www.play-hookey.com/digital/adder.html
www.play-hookey.com/digital/adder.html
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This device is called a half-adder. I have no idea why, except that it can't really be used to (easily) build k-bit adders. ... The problem with a half-adder is that there it doesn't handle carries. When you look at the left column of the addition...
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www.cs.umd.edu/class/sum2003/cmsc311/Notes/Comb/adder.h...
www.cs.umd.edu/class/sum2003/cmsc311/Notes/Comb/adder.html
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As a first example of useful combinational logic, let's build a device that can add two binary digits together. We can quickly calculate what the answers should be: ... This device is called a half-adder for reasons that will make sense in the next section. ... A Full-Adder...
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www.allaboutcircuits.com/vol_4/chpt_9/2.html
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The basic 1-bit half-adder and full-adder circuits. The sum bit is calculated with XOR gates, while the AND gates are used to check whether two (or more) inputs are 1, which implies that the carry out bit must be set.
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tams-www.informatik.uni-hamburg.de/applets/hades/webdem...
tams-www.informatik.uni-hamburg.de/applets/hades/webdemos/20-arithmetic/10-adders/halfadd-fulladd.html
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The design of a half-adder (HA) unit, and the means of implementing the functions thereof, are disclosed in: E.L. Johnson and M.A. Karim, Digital Design - A pragmatic approach , p.p. 132-133, PWS Engineering , Boston, USA.
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www.freepatentsonline.com/EP0142912.html
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US Patent References: ... 2818555 Magnetic control systems ... 2842755 Ternary magnetic storage device...
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www.freepatentsonline.com/3163852.html
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We have constructed a solution-phase array of three deoxyribozyme-based logic gates that behaves as a half-adder. ... Deoxyribozyme-based three-input logic gates and construction of a molecular full adder.
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www.ncbi.nlm.nih.gov/pubmed/12769576
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A molecule-based binary half-adder with optical inputs and outputs has been demonstrated. The half-adder consists of two photochromic organic molecules in solution and a third-harmonic-generating crystal. One substance acts as an AND Boolean logic gate and the other as an XOR gate.
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www.ncbi.nlm.nih.gov/pubmed/15584702
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