On-chip frequency compensation with a dual signal path operational transconductance amplifier for a voltage mode control DC/DC converter  

作　　者：叶强 刘洁 袁冰 来新泉 刘宁 

机构地区：[1]Institute of Electronic CAD,Xidian University,Xi'an 710071,China [2]Key Laboratory of High-Speed Circuit Design and EMC,Ministry of Education,Xidian University,Xi'an 710071,China

出　　处：《Journal of Semiconductors》2012年第4期111-116,共6页半导体学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.60876023);the Fundamental Research Funds for the Central Universities,China(No.K50511020031 )

摘　　要：A novel onchip frequency compensation circuit for a voltagemode control DC/DC converter is pre sented. By employing an RC network in the two signal paths of an operational transconductance amplifier （OTA）, the proposed circuit generates two zeros to realize high closedloop stability. Meanwhile, full onchip integration is also achieved due to its simple structure. Hence, the number of offchip components and the board space is greatly reduced. The structure of the dual signal path OTA is also optimized to help get a better transition response. Im plemented in a 0.5 #m CMOS process, the voltage mode control DC/DC converter with the proposed frequency compensation circuit exhibits good stability. The test results show that both load and line regulations are less than 0.3%, and the output voltage can be recovered within 15 #s for a 400 mA load step. Moreover, the compensation components area is less than 2% of the die＇s area and the board space is also reduced by 11%. The efficiency of the whole chip can be up to 95%.A novel onchip frequency compensation circuit for a voltagemode control DC/DC converter is pre sented. By employing an RC network in the two signal paths of an operational transconductance amplifier （OTA）, the proposed circuit generates two zeros to realize high closedloop stability. Meanwhile, full onchip integration is also achieved due to its simple structure. Hence, the number of offchip components and the board space is greatly reduced. The structure of the dual signal path OTA is also optimized to help get a better transition response. Im plemented in a 0.5 #m CMOS process, the voltage mode control DC/DC converter with the proposed frequency compensation circuit exhibits good stability. The test results show that both load and line regulations are less than 0.3%, and the output voltage can be recovered within 15 #s for a 400 mA load step. Moreover, the compensation components area is less than 2% of the die＇s area and the board space is also reduced by 11%. The efficiency of the whole chip can be up to 95%.

关 键 词：DC/DC convertor voltage mode control on-chip frequency compensation STABILITY 

分 类 号：TN722[电子电信—电路与系统] TM46[电气工程—电器]