Op-amps and startup circuits for CMOS bandgap references with near 1-V supply

被引:78
作者
Boni, A [1 ]
机构
[1] Univ Parma, Dipartimento Ingn Informaz, I-43100 Parma, Italy
关键词
bandgap-based voltage reference; CMOS integrated circuits; low-voltage design; voltage reference;
D O I
10.1109/JSSC.2002.803055
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The design of bandgap-based voltage references in digital CMOS raises several design difficulties, as the supply voltage is lower than the silicon bandgap in electron volts, i.e., 1.2 V. A current-mode architecture is used in order to address the main issues posed by the low supply, but the implementation of the operational amplifier and of dedicated startup circuits deserves some attention. Even if nonstandard devices such as depletion-mode MOS transistors may be helpful to manage the supply scaling, they are seldom available and poorly characterized. Therefore, they must be avoided in a robust design featuring a high portability. This paper proposes some circuit solutions suitable for very low-supply-voltage operation and addresses the main issues of achieving the correct bias point at the power on. A few bandgap references were implemented in digital 0.35- and 0.18-mum technologies featuring a nominal output voltage of about 500 mV and minimum supplies from 1.5 to 0.9 V.
引用
收藏
页码:1339 / 1343
页数:5
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