Design of Novel Ultra-Low Leakage CMOS Sleepy Stack Structure for circuits with Low Leakage Power Consumption

Leakage power consumption of current CMOS technology is already a great challenge. International Technology Roadmap for Semiconductors projects that leakage power consumption may come to dominate total chip power consumption as the technology feature size shrinks. Leakage is a serious problem particularly for CMOS circuits in nano scaletechnology. In this paper a novel ultra-low leakage CMOS circuit structure called the "sleepy stack” is proposed. Unlike many other previous approaches, sleepy stack can retain logic state during sleep mode while achieving ultra-low leakage power consumption. The sleepy stack CMOS circuit structure is applied to generic logic circuits. Although the sleepy stack incurs some delay and area overhead, the sleepy stack technique achieves the lowest leakage power consumption among known state-saving leakage reduction techniques, thus, providing circuit designers with new choices to handle the leakage power problem.