Efficient multiternary digit adder design in CNTFET technology

This letter presents an efficient multiternary digit (trit) adder design in carbon nanotube field effect transistor technology. The adder is based on an efficient single-trit full-adder design with low-complexity encoder and reduced complexity carry-generation unit. Further, we optimize the number of encoder and decoder blocks required while putting together several single-trit full-adder units to realize a multitrit adder. Extensive HSPICE simulation results show roughly 79% reduction in power-delay product for three-trit adders and 88 % reduction in power-delay product for nine-trit adders in comparison to a direct realization. © 2002-2012 IEEE.