Optical binary logic gate-based modified signed-digit arithmetic

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• 作者：Fyath ; R.S. ; Alsaffar ; A.A.W. ; Alam ; M.S.
• 关键词：Modified signed-digit ; Optical logic gate ; Binary coded MSD ; Shadow-casting system ; Decoding mask
• 刊名：Optics and Laser Technology
• 出版年：2002
• 出版时间：October, 2002
• 年：2002
• 卷：34
• 期：7
• 页码：501-508
• 全文大小：202 K

文摘

A new design approach for a three-step modified signed-digit (MSD) adder is presented that can be optically implemented using binary logic gates. The proposed scheme depends on encoding each MSD digits into a pair of binary digits using a two-state and multi-position encoding scheme. The proposed design algorithm depends on constructing the addition truth table of binary-coded MSD numbers and then using Karnaugh map to achieve output minimization. The optical binary logic gates are obtained by simply programming the decoding masks of a shadow-casting-based optical logic gate system. The proposed scheme results in a simple, compact, and efficient optical binary gate-based parallel addition system.