Design of Thermometer Coding and One-Hot Coding

摘要

In this paper, two new efficient modular adders are implemented using basic logic gates. The designed modular adder consists of AND gates and OR gates. Modular addition is the most important and frequent operation applied to the components of Residues number systems. The technology used for designing these adders is Verilog coding in Xilinx ISE 14.7. The conventional mux’s based method consists of decoder and encoder to covert one of the operand to binary format in both the techniques. The small and medium dynamic range requirements of low-power embedded and edge devices make the usage of the thermometer coding and one-hot coding viable, reducing the power consumption and improving the energy efficiency of modulo addition in comparison to regular binary representations. The major problem with the conventional method is increase in transistor count, delay, power consumption and area. This research work principally concentrated to curtail the power consumption and to increase the performance of the mux based structure by replacing the multiplexers with the basic logic gates so as to reduce the delay. With the purpose of reducing power consumption, AND and OR gates are implemented using various logics such as Complementary metal oxide semiconductor (CMOS) logic, AND-OR Inverter (AOI), OR- AND Inverter (OAI) logic. Performance parameters of thermometer and one-hot coding such as conversion time as well as average power calculated and compared. It is verified obtained using logic gates are average power 14.68mW, 15.36mW and delay 7.915ns, 6.608ns and area i.e., LUTs used are less compared to the mux based structure and with other designs.