半导体学报2011，Vol.32Issue(7)：81-88,8.DOI:10.1088/1674-4926/32/7/075004
A low noise high efficiency buck DC-DC converter with sigma-delta modulation
A low noise high efficiency buck DC-DC converter with sigma-delta modulation
摘要
Abstract
Some research efforts to improve the efficiency and noise performance of buck DC-DC converters are explored.A carefully designed power MOSFET driver,including a dead time controller,discontinuous current mode (DCM) controller and gate width controller,is proposed to improve efficiency.Instead of PWM modulation,sigma-delta modulation is introduced into the feedback loop of the converter to move out the clock-referred harmonic spike.The proposed converter has been designed and fabricated by a 0.35 μm CMOS process.Measured results show that the peak efficiency of the converter can reach 93% and sigma-delta modulation suppresses the harmonic spike by 30 dB over PWM modulation.关键词
buck DC-DC converter/PWM modulation/sigma-delta modulation/DCM/dead time control/width control/current sensingKey words
buck DC-DC converter/PWM modulation/sigma-delta modulation/DCM/dead time control/width control/current sensing引用本文复制引用
Cai Shujiang,Pi Changming,Yan Wei,LiWenhong..A low noise high efficiency buck DC-DC converter with sigma-delta modulation[J].半导体学报,2011,32(7):81-88,8.基金项目
Project supported by the National High Technology Research and Development Program of China (No.2009AA011607). （No.2009AA011607）
