On-Chip Solar Energy Harvester and PMU With Cold Start-Up and Regulated Output Voltage for Biomedical Applications. - Diego Cabello; Esteban Ferro; Óscar Pereira-Rial; Beatriz Martínez-Vázquez; Víctor M. Brea 001; Juan M. Carrillo; Paula López 001 (IEEE Trans. Circuits Syst. I Fundam. Theory Appl., 2020)