Integrated Class DE Synchronized DC-DC Converter for On-Chip Power Supplies

A 12.5-mW dc-dc resonant converter with a 500 MHz class DE power inverter and class E synchronous rectifier was designed and simulated on a 1.2 mum CMOS process chip. A 20 nH spiral inductor was used in the resonant circuit. The class DE inverter requires lower inductance than the PWM buck converter. Soft switching operation enables high conversion efficiency at high operating frequencies. The class DE inverter is a good candidate for on-chip switching converters because of very high efficiency, smaller passive elements, and low peak switch voltage