Binary adders

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Bi nary adders Binary adder is a basic circuit performing addition operation for binary numbers A and B. This
simple combinational circuit obtains two signals Si (sum) and Ci+1 (carry to next position) from
signals Ai, Bi and Ci (carry from previous position). Fig. 1 presents the truth table and logic symbol
of 1-bit adder.
There are also more complex circuits. For example in fig. 2 there is presented n-bit adder. Input
signals A and B are represented as signals An-1...A0 and Bn-1..B0. Also the output sum is
represented as signals Sn-1..S0. This circuit also has carry signals: input (C0) and output (Cn).
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