Research and Design of a MSD Adder of Ternary Optical Computer

The further improvement of basic theory of ternary optical computer (TOC) and the implementation of thousand-bit ternary optical experimental system have promoted the rapid development of TOC. However, lack of adder has confined the applications of TOC to logic operations. The research and design of the adder which is the core component of TOC has become an urgent research topic. Based on the research of feedback strategy, the paper presents the design of a TOC adder based on Modified Signed-Digit (MSD) number system. Combined with the characteristics of thousands bits of the experimental system, the adder is implemented based on the arithmetic unit which is constructed following MSD regulations based on decrease-radix design together with data feedback strategy. Experiment results show that the structure and design of the adder is correct and it has many advantages over the traditional adders with carry.