A fully integrated power supply unit for fine grain power management application to embedded Low Voltage SRAMs

In complex embedded applications, optimization and adaptation at run time of both dynamic and leakage power have become an issue at SoC coarse grain. We propose in this paper a fully integrated Power Supply Unit for fine grain DVFS and adaptive leakage control. The proposed PSU offers five power modes and can be easily integrated in any IP unit. The PSU has been implemented and validated in a STMicroelectronics 65 nm technology. Dedicated Low-Voltage SRAMs have been designed to allow full DVFS. Using a Hopping technique, the dynamic power consumption can be reduced by a factor of 35%. Using an Ultra-Cut-Off technique, the static power consumption is strongly reduced in stand-by mode, 18 times better than classical MTCMOS.