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  2. Adder (electronics) - Wikipedia

    en.wikipedia.org/wiki/Adder_(electronics)

    4-bit adder with logical block diagram shown Decimal 4-digit ripple carry adder. FA = full adder, HA = half adder. It is possible to create a logical circuit using multiple full adders to add N-bit numbers. Each full adder inputs a , which is the of the previous adder. This kind of adder is called a ripple-carry adder (RCA), since each carry ...

  3. File:4-Bit Full Adder.svg - Wikipedia

    en.wikipedia.org/wiki/File:4-Bit_Full_Adder.svg

    Block Diagram of a 4-Bit Full Adder. Date: 05/08/06: Source: Own drawing, Inkscape 0.43: Author: inductiveload: Permission (Reusing this file) PD: Licensing.

  4. Carry-lookahead adder - Wikipedia

    en.wikipedia.org/wiki/Carry-lookahead_adder

    A partial full adder, with propagate and generate outputs. Logic gate implementation of a 4-bit carry lookahead adder. A block diagram of a 4-bit carry lookahead adder. For each bit in a binary sequence to be added, the carry-lookahead logic will determine whether that bit pair will generate a carry or propagate a carry.

  5. File:4-Bit Ripple Adder.svg - Wikipedia

    en.wikipedia.org/wiki/File:4-Bit_Ripple_Adder.svg

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  6. Kogge–Stone adder - Wikipedia

    en.wikipedia.org/wiki/Kogge–Stone_adder

    An example of a 4-bit Kogge–Stone adder is shown in the diagram. Each vertical stage produces a "propagate" and a "generate" bit, as shown. The culminating generate bits (the carries) are produced in the last stage (vertically), and these bits are XOR'd with the initial propagate after the input (the red boxes) to produce the sum bits. E.g., the first (least-significant) sum bit is ...

  7. File:4-bit ripple carry adder.svg - Wikipedia

    en.wikipedia.org/wiki/File:4-bit_ripple_carry...

    Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

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  9. Carry-select adder - Wikipedia

    en.wikipedia.org/wiki/Carry-select_adder

    A 16-bit carry-select adder with a uniform block size of 4 can be created with three of these blocks and a 4-bit ripple-carry adder. Since carry-in is known at the beginning of computation, a carry select block is not needed for the first four bits. The delay of this adder will be four full adder delays, plus three MUX delays.