Design Of Adaptive Power Supply Regulating Circuit Against PVT Fluctuation

As the CMOS process and the design of integrated circuits (IC) develop, the technique size has continuously shrunk, and IC have been affected by the fluctuation of process, voltage and temperature (PVT). When the chips entered the deep-micrometer era, the leakage of transistors has been more serious. And the widely used portable electronic equipments work in standby state at most time, so the research on the resist of the PVT fluctuation and the static low power technology is important in practical application.The PVT fluctuation comes from the chip manufacture steps and the environment of the functional circuits. Because the PVT fluctuation has bad effect on the performance, reliability and power of IC, it should consider the PVT fluctuation in the design of IC. Adaptive power supply is a low power technique at runtime. In order to meet the constraints of the performance and power, it quickly adjusts power supply on the basis of the PVT fluctuation. As SoC is widely used, adaptive power supply technology will face the challenge of speed and power. Therefore, the design of adaptive power supply need synthesize the circuit system function, performance and power.The dissertation firstly apprehended leakage mechanism and the source of the PVT fluctuation, used adaptive power supply technology and SMIC 90nm process, and then designed a fast adaptive power supply regulating circuit withstanding the PVT change. The circuit dissipated 53.85μW leakage power and quickly modulated the chip's static power supply with the change of process and temperature in less than 30ns. The proposed circuit was applied on ISCAS'85 benchmark circuits and the HSPICE simulation showed: the standby leakage power had reduced in different processes and variable temperatures; the maximum leakage power reduction percentage is 96.2; the larger the circuit was, the more the leakage power reduced. The proposed circuit can adaptively adjust the power supply to its optimal value during the whole standby period, which results in considerable reduction of leakage power and effective compensation of process and temperature variations.