ASIC Implementation and Comparison of Diminished-one Modulo 2n+1 Adder

Modulo 2n+1 adder is one of the most common adder which have frequent use in RNS operations that has significant critical path, and often encountered in applications like pseudo-random number generation and cryptography as well. In this paper we have presented various types of diminished-one modulo 2n+1 adder using globular carry selection (GCS) and several parallel prefix adders. The adder has been simulated using verilog HDL codes and mapped this design to the TSMC (90 nm) and calculated the area, power dissipation and time for n= 8, 16, 32& 64 and shown in the graph that which adder will have better power efficiency and time delay. Area occupied by several bits is presented in the table.