A 33V to 1V Ripple-Less Buck Converter With the Inverted AC Current Replica Circuit and Sub-0.5% Output Ripple for 5G Low Earth Orbit Application

The proposed ripple-less buck converter (RLBC) uses a two-phase topology with an inverted AC current replica (IACCR) circuit to reduce output voltage ripple to meet the error vector magnitude (EVM) requirement of 5G NR low earth orbit (LEO) application. Assistance Inductance (AI) circuit emulates inductor current to avoid using extra inductors. Ripple Minimization (RM) circuit further reduces output ripple by synchronizing the switching moment of power MOSFETs. Therefore, the proposed RLBC achieves 5G NR LEO standards with an EVM of -28.85dB.