20.8 A 500nW batteryless integrated electrostatic energy harvester interface based on a DC-DC converter with 60V maximum input voltage and operating from 1μW available power, including MPPT and cold start. - Stefano Stanzione; Chris van Liempd; Misato Nabeto; Refet Firat Yazicioglu; Chris Van Hoof (ISSCC, 2015)