Design of Low Power D Flip-Flop Using CMOS Technology: A Comprehensive Review

Abstract

The D flip-flop (DFF) serves as a fundamental sequential storage element in modern digital integrated circuits, directly influencing system power consumption, timing performance, and silicon area. As CMOS technology continues scaling into the nanometer regime, power dissipation has emerged as the primary design constraint, driving extensive research into low-power D flip-flop architectures. This review provides a comprehensive examination of CMOS D flip-flop design methodologies, synthesizing findings from recent literature spanning 2015–2026. The review systematically analyzes architectural alternatives including conventional master-slave configurations, transmission gate-based designs, True Single-Phase Clock (TSPC) topologies, dual-edge triggered flip-flops (DETFF), and pulse-triggered structures. Power reduction techniques including clock gating, multi-threshold CMOS (MTCMOS), sleep transistor techniques, and dual-edge triggering are comparatively evaluated. Emerging technologies such as FinFET and their application to low-power flip-flop design are also examined. Key findings reveal that hybrid approaches combining clock gating with transmission gate logic can achieve significant dynamic power reduction, while FinFET-based implementations demonstrate power savings of up to 9.36% compared to conventional CMOS designs (Saraswathi, 2025). The review identifies critical trade-offs between power, delay, and area, providing guidance for technology selection based on application requirements.