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发表于 2012-7-7 20:05:49
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一种共源共栅自偏置带隙基准源设计
李 亮
1
,陈珍海
2
(1.苏州市职业大学电子信息工程系,苏州 215104;2.中国电子科技集团公司第 58 所,无锡 214035)
摘 要:在分析带隙基准理论的基础上,针对 SoC 芯片的 1. 2V 数字电路供电,设计一个低功耗低
温度系数、高电源抑制比的带隙基准源。电路由一个与绝对温度成正比(PTAT)电流源和一个绝
对温度相补(CTAT)电流源叠加构成,采用低压共源共栅自偏置结构来减少镜像失配和工艺误差
对电路的影响。 在 SMIC 0.13 μ m 混合信号 CMOS 工艺下, 电源电压为 2.5V 时, 使用 Cadence Spectre
对电路进行模拟,结果表明可实现 1. 2V 输出电压,电源抑制比在低频段为 -86dB、高频段为 -53dB,
温度系数为 12 × 10
-6
/℃、功耗为 0. 57mW。带隙电压基准源的版图面积为 75 μ m × 86 μ m。
关键词:带隙基准源;共源共栅;自偏置
中图分类号:TN431 文献标识码:A 文章编号:1681-1070(2010)01-0024-04
Design of a Cascade Self-abiasing Bandgap Reference
LI Liang
1
, CHEN Zhen-hai
2
(1. Dept. of Electr onic and Information Engineering,Suzhou V ocational University,Suzhou 215104,China;
2. China Electr onic T echnology Gr oup Corporation, No.58 Resear ch Institute ,W uxi 214035,China)
Abstract: A bandgap reference of low temperature coef ficient, low-power and high PSRR is designed that is
based on theory of bandgap ref erence f or digital circuits whose power supply is 1.2V on a SoC chip, The Circuit
str ucture consi sts of a proportional to absolute temperature (PTA T) current source and a complementary to
absolute temperature (CT A T) current source,which adopts low-voltage cascode self -biasing structure to reduce
the mirror mi smatch and technology err ors effect on the circui t. The schematic simulation is by the tools of
Cadence Spectre with SMIC 0.13μm mixed-signal CMOS technology at power supply of 2.5V. The simulation
results shows the output voltage is 1.2V, PSRR of low f requency is -86dB, PSRR of high frequency is -53dB ,the
temperature coefficient is 12×10
-6
/℃, the power dissipation is 0.57mW. The area of bandgap ref erence layout
is 75 μ m × 86 μ m.
Key words: bandgap reference; cascade; self-abiasing |
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