| 基准电流源的小信号分析与设计 |
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| 引用本文： | 冯春涛,冯全源,王锴. 基准电流源的小信号分析与设计[J]. 半导体技术, 2008, 33(1): 42-45 |
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| 作者姓名： | 冯春涛 冯全源 王锴 |
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| 作者单位： | 西南交通大学,微电子研究所,成都,610031;西南交通大学,微电子研究所,成都,610031;西南交通大学,微电子研究所,成都,610031 |
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| 摘 要： | 研究了一种常用Widlar型基准电流源结构,分析电源电压对于基准电流的影响.通过引入小信号分析方法,建立基准电流源的小信号等效模型,运用反馈电路分析理论,得出基准电流与电源电压之间的关系.进而通过改进基准电流源的结构以增大反馈回路增益,减小电源电压对于工作点的影响,设计出一个具有高电源抑制比的基准电流源.该电路经由UMC 0.6 μmBICMOS工艺仿真,当电源电压在2.7～5.5 V时,其电源抑制比高达193 dB,电压调整率仅为250×10-6/V.
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| 关 键 词： | 基准电流源 小信号分析 电源抑制比 |
| 文章编号： | 1003-353X（2008）01-0042-04 |
| 收稿时间： | 2007-06-11 |
| 修稿时间： | 2007-06-11 |
Small Signal Analysis and Design of Reference Current Source |
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| Feng Chuntao,Feng Quanyuan,Wang Kai. Small Signal Analysis and Design of Reference Current Source[J]. Semiconductor Technology, 2008, 33(1): 42-45 |
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| Authors: | Feng Chuntao Feng Quanyuan Wang Kai |
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| Affiliation: | Feng Chuntao,Feng Quanyuan,Wang Kai(Institute of Microelectronics,Southwest Jiaotong University,Chengdu 610031,China) |
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| Abstract: | A conventional Widlar reference current source was presented and the influence of the power supply voltage on the reference current was analyzed.Based on the equivalent small signal model of the circuit,using the feedback theory,the relationship between reference current and power supply was described.By improving the configuration of the reference current source,the loop gain was increased and the effect of supply voltage on the working point was reduced,a high PSRR reference current source was designed.Th... |
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| Keywords: | reference current source small signal analysis PSRR |
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