A low-noise high-efficient buck converter with noise-shaping technique

摘要

In this paper, a buck converter is designed with a noise-shaping technique to reduce noise and uses synchronous rectification to increase power efficiency. The measured results show the peak noise level less than -84.5dBm at 2MHz and achieve 85% to 93.5% power efficiency with output voltage between 1.8V to 2.5V and a load current range from 50mA to 200mA. The buck converter is fabricated with TSMC 0.35μm CMOS DPQM process. The chip area is 1.417mm*1.239 mm.