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2. Adder–subtractor - Wikipedia

   en.wikipedia.org/wiki/Adder–subtractor

   A 4-bit ripple-carry adder–subtractor based on a 4-bit adder that performs two's complement on A when D = 1 to yield S = B − A. Having an n-bit adder for A and B, then S = A + B. Then, assume the numbers are in two's complement. Then to perform B − A, two's complement theory says to invert each bit of A with a NOT gate then add one.

3. File:4-bit ripple carry adder-subtracter.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.

4. Carry-skip adder - Wikipedia

   en.wikipedia.org/wiki/Carry-skip_adder

   Breaking this down into more specific terms, in order to build a 4-bit carry-bypass adder, 6 full adders would be needed. The input buses would be a 4-bit A and a 4-bit B, with a carry-in (CIN) signal. The output would be a 4-bit bus X and a carry-out signal (COUT). The first two full adders would add the first two bits together.

5. 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 ...

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

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

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7. Subtractor - Wikipedia

   en.wikipedia.org/wiki/Subtractor

   The full subtractor is a combinational circuit which is used to perform subtraction of three input bits: the minuend , subtrahend , and borrow in . The full subtractor generates two output bits: the difference D {\displaystyle D} and borrow out B out {\displaystyle B_{\text{out}}} .

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

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

   Printable version; Page information; Get shortened URL; Download QR code; ... Block Diagram of a 4-Bit Full Adder. Date: 05/08/06: Source: Own drawing, Inkscape 0.43 ...

9. Carry-select adder - Wikipedia

   en.wikipedia.org/wiki/Carry-select_adder

   A conditional sum adder [3] is a recursive structure based on the carry-select adder. In the conditional sum adder, the MUX level chooses between two n/2-bit inputs that are themselves built as conditional-sum adder. The bottom level of the tree consists of pairs of 2-bit adders (1 half adder and 3 full adders) plus 2 single-bit multiplexers.