A full on-chip CMOS low-dropout voltage regulator with VCCS compensation

A full on-chip CMOS low-dropout（LDO） voltage regulator with high PSR is presented.Instead of relying on the zero generated by the load capacitor and its equivalent series resistance,the proposed LDO generates a zero by voltage-controlled current sources for stability.The compensating capacitor for t...

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Bibliographic Details
Published in:Journal of semiconductors 2010 (8), p.132-136
Main Author: 高雷声 周玉梅 吴斌 薄见花
Format: Article
Language:Chinese
Subjects:
CMOS技术
低压差
器具
电压控制电流源
稳压
等效串联电阻
补偿电容器
负载电容
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Summary:A full on-chip CMOS low-dropout（LDO） voltage regulator with high PSR is presented.Instead of relying on the zero generated by the load capacitor and its equivalent series resistance,the proposed LDO generates a zero by voltage-controlled current sources for stability.The compensating capacitor for the proposed scheme is only 0.18 pF,which is much smaller than the capacitor of the conventional compensation scheme.The full on-chip LDO was fabricated in commercial 0.35μm CMOS technology.The active chip area of the LDO（including the bandgap voltage reference） is 400×270μm~2.Experimental results show that the PSR of the LDO is-58.7 dB at a frequency of 10 Hz and-20 dB at a frequency of 1 MHz.The proposed LDO is capable of sourcing an output current up to 50 mA.
ISSN:1674-4926