Optimal and Robust Saturated Control for a Clock Generator

Carolina Albea-Sanchez (1) , Suzanne Lesecq (2) , Diego Puschini (2)

1 LAAS - Laboratoire d'analyse et d'architecture des systèmes
2 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information

Fine-grain Dynamic Voltage and Fre- quency Scaling (DVFS) is becoming a requirement for Globally-Asynchronous Locally-Synchronous (GALS) architectures. However, the area overhead of adding voltage and frequency control engines in each volt- age/frequency island must be taken into account to optimize the circuit. This paper focuses on the control for the frequency actuator. An optimal and robust saturated control law, with a minimum hardware implementation area is proposed for a Clock Gen- erator, taking into account the delay introduced by the sensor. This controller is designed with Lyapunov-Krasovskii theory that ensures asymptotic stability, disturbance rejection as well as system robustness with respect to delay presence and parameter uncertainties. The closed-loop system presents a regional stabilization due to the actuator saturation. An estimation of a maximum attraction domain is provided. The performance achieved with this controller are shown in simulation.

Mots clés: Robust control; optimal control; delay-time systems; Nano circuits

Domaines: Automatique

Carolina Albea-Sanchez, Suzanne Lesecq, Diego Puschini. Optimal and Robust Saturated Control for a Clock Generator. 50th IEEE Conference on Decision and Control and European Control Conference (CDC-ECC), Dec 2011, Orlando, United States. pp. 657-662, ⟨10.1109/CDC.2011.6160449⟩. ⟨hal-00256628v2⟩