Polarization encoded optical shadow casting logic units: Design of trinary half subtractor using various input coding scheme

In this paper we evolve several input pixel pattern scheme for trinary half Subtractor design. This is a follow-up paper of half adder design of A. A. Hadi et. al. 2012 [1], where various coding scheme were designed only for logic unit design of trinary half adder. Different input coding schemes for half subtractor are calculated in this paper by changing the minterm grouping conditions. New pixel patterns are designed based on the design of R. A. Rizvi et. el. 1991[6], which are more efficient, cost effective and convenient for integrating larger complex design. The POSC [2] modified algorithm is used to design and implement trinary half Subtractor. A set of POSC equation are obtained from the truth table of the desired arithmetic unit. Each design has various merits on other designs.