adder Definition and Topics - 3 Discussions

An adder is a digital circuit that performs addition of numbers.
In many computers and other kinds of processors adders are used in the arithmetic logic units or ALU. They are also used in other parts of the processor, where they are used to calculate addresses, table indices, increment and decrement operators and similar operations.
Although adders can be constructed for many number representations, such as binary-coded decimal or excess-3, the most common adders operate on binary numbers.
In cases where two's complement or ones' complement is being used to represent negative numbers, it is trivial to modify an adder into an adder–subtractor.
Other signed number representations require more logic around the basic adder.

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  1. T

    Implementing a function using an adder and a multiplier

    Homework Statement [/B]Z is an unsigned 9 bit number and X is an unsigned 3 bit number. The only available components are an 8 bit adder and a 4-bit x 4-bit multiplier. c.) We have a single 8 bit adder and a single 4-bit x 4-bit multiplier. We would like to implement...
  2. ichabodgrant

    Comparator design using a 4-bit adder

    Homework Statement Hi, it's me again. Now I am going to design a 4-bit magnitude comparator using just ONE 4-bit adder and infinitely large number of gates (AND, OR, NOT, NAND, NOR, XOR, XNOR) for signed numbers (negative binary). Homework Equations A > B => A3barB3 + A2barB2x3 +...
  3. 010101

    Full Optical Adder

    If we use 2 lasers with selectable light intensities as input, with each level of intensity corresponding to decimal number. Like level 0 intensity - decimal 0 (MIN) level 1 intensity - decimal 1 level 2 intensity - decimal 2 ... level 9 intensity - decimal 9 (MAX) and directly shine both of...