北京大学学报(自然科学版)

一种适用于77 K下读出电路的电流源

唐矩1,鲁文高,陈中建,吉利久,张兴   

  1. 北京大学信息科学技术学院微电子系,北京,100871;1通讯作者,E-mail:tangju@pku.edu.cn
  • 收稿日期:2006-11-08 出版日期:2007-09-20 发布日期:2007-09-20

A Current Source in ROIC with Working Temperature of 77 K

TANG Ju1LU Wengao,CHEN Zhongjian,JI Lijiu,ZHANG Xing   

  1. Department of Microelectronics, School of Electronics Engineering and Computer Science, Peking University, Beijing,100871;1Corresponding Author, E-mail: tangju@pku.edu.cn
  • Received:2006-11-08 Online:2007-09-20 Published:2007-09-20

摘要: 给出了一种应用于低温光敏探测器读出电路的可编程电流源,工作在液氮环境(77 K),无外加单元,与一般电流源设计不同,本设计将部分MOS管设计在亚阈值区工作来提高电路工作稳定性。此电流源设计采用0.5 μm标准CMOS工艺。工作电压为5 V。室温测试当工作电压从2.3 V到6.4 V变化时,输出电流从199 nA变化到212 nA,精度为1.4%/V。在液氮环境测试当工作电压从3V到6.8 V变化时,输出电流从355 nA变化到372 nA,精度为1.3%/V。由于电路工作温度稳定,所以不要求电流源有良好的对温度稳定性。

关键词: 电流源, 77K, 亚阈值

Abstract: This paper gives a programmable current source in Readout-Integrated Circuit (ROIC) that is working in liquid nitrogen (77 K) without outside component. The design adopts MOS transistor working at sub-threshold region to enhance robust of circuit. The design uses 0.5 μm standard CMOS process with supply voltage of 5 V. From measurement result, In room temperature, output current varies from 199 nA to 212 nA with supply voltage variation from 2.3 V to 6.4 V, the precision is about 1.4%/V; In liquid nitrogen circumstance, output current varies from 355 nA to 372 nA with supply voltage variation from 3 V to 6.8 V, the precision is about 1.3%/V. As working temperature is stable, the current source's stability over temperature is not of importance.

Key words: current source, 77 K, sub-threshold

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