Design and Analysis of Ultra-Low Power Adiabatic Computational Subsystem Based on Symmetric Stacking

A novel design is proposed for the implementation of low power efficient charge recovery logic (ECRL) based adiabatic driven computational subsystem. An ultra-low power adiabatic ECRL circuit operates primarily in subthreshold regime, and is reported to consume less power as compared to CMOS implementation. Multiplier is considered a common building block in today's computation intensive design, included for various applications, however the same optimum design flow does not suit for ultra-low power applications. Higher order multiplier subsystem designed for ultra-low power requirements, involves multiple stages including compression module to reduce partial products, and generate product. The novelty of the proposed design is in applying specifically 6:3 compressor circuit to eliminate XOR gate in the critical path of the ECRL based adiabatic logic, leading to a compact layout, significant reduction in power, and performance improvement. The paper analyzes ECRL based sub-threshold driven adiabatic logic applied on 6:3 compressor circuit and further implements the same on a higher order 8 × 8 Wallace tree multiplier module. The symmetric stacking modified ECRL based adiabatic Wallace tree multiplier is recommended for ultra-low power and non-time critical driven biomedical applications. The proposed design was implemented in Cadence, and the simulation results for 45 nm technology node are reported.