Code conversion from signed-digit to complement representation based on look-ahead optical logic operations

Guoqiang Li; Feng Qian

doi:10.1117/1.1408315

1 November 2001 Code conversion from signed-digit to complement representation based on look-ahead optical logic operations

Guoqiang Li, Feng Qian

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Optical Engineering, Vol. 40, Issue 11, (November 2001). https://doi.org/10.1117/1.1408315

We present, for the first time to our knowledge, a generalized lookahead logic algorithm for number conversion from signed-digit to complement representation. By properly encoding the signed-digits, all the operations are performed by binary logic, and unified logical expressions can be obtained for conversion from modified-signed-digit (MSD) to 2's complement, trinary signed-digit (TSD) to 3's complement, and quarternary signed-digit (QSD) to 4's complement. For optical implementation, a parallel logical array module using an electron-trapping device is employed and experimental results are shown. This optical module is suitable for implementing complex logic functions in the form of the sum of the product. The algorithm and architecture are compatible with a general-purpose optoelectronic computing system.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Guoqiang Li and Feng Qian "Code conversion from signed-digit to complement representation based on look-ahead optical logic operations," Optical Engineering 40(11), (1 November 2001). https://doi.org/10.1117/1.1408315

Published: 1 November 2001

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