'Institute of Electrical and Electronics Engineers (IEEE)'
Doi
Abstract
This paper presents a switched-capacitor rectifier that provides step down voltage conversion from an ac input voltage to a dc output. Coupled with current-drive source, low-loss and high step-down rectification is realized. Implementation in CMOS with appropriate controls results in a design suitable for low-voltage very-high-frequency conversion. Applications include switched-capacitor rectification to convert high-frequency ac to a dc output and, combined with inversion and transformation, to dc-dc converters for low-voltage outputs. A two-step CMOS integrated full-bridge switched-capacitor rectifier is implemented in TSMC 0.25 μm CMOS technology for demonstration purposes. For an operation frequency of 50 MHz and an output voltage of 2.5 V, the peak efficiency of the rectifier is 81% at a power level of 4 W.Interconnect Focus Center (United States. Defense Advanced Research Projects Agency and Semiconductor Research Corporation
