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`Overturned-stairs' adder trees and multiplier design

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2 Author(s)
Mou, Z.-J. ; Dept. of Electr. Eng., Stanford Univ., CA, USA ; Jutand, F.

Wallace trees are the theoretically fastest multioperand adders. However, their complex interconnections do not permit practical implementations. A family of Overturned-Stairs trees which achieve the same speed performance as equivalent Wallace trees in many cases, but require a simple and regular interconnection scheme is introduced. These trees can be designed in a systematic way and laid out regularly in a VLSI circuit. A comparison is made between various trees to provide useful indexes for a practical design. The design of a 16×16 2's complement parallel multiplier using Overturned-Stairs trees is studied as an illustration

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Computers, IEEE Transactions on  (Volume:41 ,  Issue: 8 )