Multi-level power supply system for a complementary metal oxide semiconductor circuit

摘要

There is provided a method for managing a multi-level power supply. The method includes comparing a voltage level (Vs 1 ) of a lower voltage supply bus to a voltage level (Vs 2 ) of a higher voltage supply bus, and routing current from the lower voltage supply bus to the higher voltage supply bus if Vs 2 <Vs 1 . The lower and higher voltage supply busses provide power to a complementary metal oxide semiconductor (CMOS) circuit. The method prevents a latch-up of the CMOS circuit. There is also provided a circuit that employs the method.