Title :
Analysis of CMOS low-dropout regulator — Power-supply rejection ratio
Author :
Ho, Marco ; Ka Nang Leung ; Pui Ying Or ; Jianping Guo
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Hong Kong, China
Abstract :
This paper provides a detailed analysis of the power-supply rejection ratio (PSRR) of low-dropout (LDO) regulator. The paper includes circuit modeling of a generic LDO with signal injection at its supply. Based on the modeling, the transfer function of PSRR is derived. Thorough analysis of the locations of poles and zeros obtained from the transfer function is carried out, and then recommendations to improve PSRR are given. The proposed model and the achieved results are verified by circuit simulations using BSEVI models of a commercial CMOS 0.35-μm technology. The results reveal good agreement between the modeling and the PSRR property of a LDO.
Keywords :
CMOS integrated circuits; integrated circuit modelling; poles and zeros; power supply circuits; transfer functions; voltage regulators; BSEVI models; CMOS low-dropout regulator analysis; PSRR; circuit simulations; generic LDO circuit modeling; poles and zeros locations; power-supply rejection ratio; signal injection; size 0.35 mum; transfer function; Bandwidth; Integrated circuit modeling; Poles and zeros; Power transistors; Regulators; WiMAX;
Conference_Titel :
Circuits and Systems (APCCAS), 2014 IEEE Asia Pacific Conference on
Conference_Location :
Ishigaki
DOI :
10.1109/APCCAS.2014.7032731
