J.M. Hinojo is a postdoctoral researcher at the Department of Electronic Engineering, University of Seville, Spain. His main research interests include power management circuits as low-dropout regulators or DC/DC converters and low-power low-voltage analogue microelectronics. C. Luján-Martínez is a postdoctoral researcher at the Department of Electronic Engineering, University of Seville, Spain. Her main research interests are in low power low voltage analogue and mixed signal microelectronics.Antonio Torralba is a Professor and Director at the Department of Electronics Engineering, School of Engineering, University of Seville, Spain. He leads a research group on mixed signal design and his research interests include low power low voltage analogue and mixed signal microelectronics.