EM Side-Channel Countermeasure for Switched-Capacitor DC-DC Converters Based on Amplitude Modulation - Jevtic, Ruzica; Ylitolva, Marko; Calonge, Clara; Ojanen, Martti; Santti, Tero; Koskinen, Lauri (Ieee Transactions On Very Large Scale Integration (Vlsi) Systems, 2021)