Universal Shift Register: QCA based Novel Technique for Memory Storage Modules
Journal of VLSI Circuits and Systems · 2023
A Quantum-dot cellular automaton (QCA) represents a modern technology for implementing small-sized circuits with high-performance, low-power consumption and various computations in digital circuits at the nanoscale level.These quantum dots made up at a nanoscale level which increases the performance of circuits.With the invention of QCA in electronics, the circuits can achieve their operations with very high efficiency and with low power dissipation.Meanwhile, a universal shift register (USR) is a particular circuit with the functions of storing and shifting bits to a specified direction and is observed as an essential component.This USR also has the process to load the data.Therefore, here we propose a USR circuit based on QCA, i.e., QUSR, which requires the essential components of a shift register and a multiplexer (Mux) combined and used to select the operation of the USR.In this project, we propose a 2-to-1 Mux, which then extended to a 4-to-1 Mux.Here, we suggest a new D flip-flop and design a shift register by connecting all of these.Finally, we propose a QUSR that consumes low power and computes high-performance by combining four 4-to-1 Muxes and a four-bit shift register.The proposed QUSR is highly efficient in time and space complexities and has a good energy dissipation performance.The proposed design performance metric of efficiency achieved by doing required simulations using the QCA Designer tool.