Minimum Energy Tracking Loop With Embedded DC-DC Converter Enabling Ultra-Low-Voltage Operation Down To 250 MV In 65 Nm CMOS

Ramadass, Y. K., A. P. Chandrakasan, "Minimum Energy Tracking Loop With Embedded DC-DC Converter Enabling Ultra-Low-Voltage Operation Down to 250 mV in 65 nm CMOS," IEEE Journal of Solid-State Circuits, pp. 256-265, January 2008.