Design of Low-Voltage FO-[PD] Controller for Motion Systems

Abstract

Fractional-order controllers have gained significant research interest in various practical applications due to the additional degrees of freedom offered in their tuning process. The main contribution of this work is the analog implementation, for the first time in the literature, of a fractional-order controller with a transfer function that is not directly constructed from terms of the fractional-order Laplacian operator. This is achieved using Padé approximation, and the resulting integer-order transfer function is implemented using operational transconductance amplifiers as active elements. Post-layout simulation results verify the validity of the introduced procedure.

Keywords

• CMOS analog integrated circuits
• operational transconductance amplifiers
• low-voltage circuits
• fractional-order circuits
• fractional-order controllers
• motion control systems