Multivariable voltage and frequency control for DVFS management

During the last decade, Dynamic Voltage and Frequency Scaling (DVFS) techniques have been widely proposed to improve integrated circuit power efficiency. In the present work, an optimal control is proposed to jointly control the voltage and frequency transient periods of both the supply voltage and clock frequency actuators. This control law is based on a multivariable optimal controller for trajectory tracking with an integrator. At the same time it ensures the global system stability and promotes design reuse, the proposed controller also increases the system performance during the transition. Simulation results with MatLab Simulink are also provided to show the effectiveness of the technique. Moreover, Register Transfer Level (RTL) simulation shows that the proposed control can be implemented in hardware within a chip.