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一种衬底驱动的0.5V全差分运算放大器

张洹千1,2;杨银堂1;朱樟明1
  

  1. (1. 西安电子科技大学 微电子学院,陕西 西安 710071;
    2. 英飞凌科技有限公司,陕西 西安 710075)
  • 收稿日期:2007-09-27 修回日期:1900-01-01 出版日期:2008-12-20 发布日期:2008-12-20
  • 通讯作者: 张洹千

Novel 0.5V bulk driven full differential Amp

ZHANG Huan-qian1,2;YANG Yin-tang1;ZHU Zhang-ming1
  

  1. (1. School of Microelectronic, Xidian Univ., Xi’an 710071, China;
    2. Infineon AG, Xi’an 710075, China)
  • Received:2007-09-27 Revised:1900-01-01 Online:2008-12-20 Published:2008-12-20
  • Contact: ZHANG Huan-qian

摘要: 为了满足当今对低压低功耗电路的需求,设计了一种工作在0.5V电源电压环境的全差分运算放大器.电路使用了由衬底驱动的输入级和工作在亚阈值区的输出级,并利用交叉耦合输入晶体管的结构产生负跨导来提高增益.采用0.18μm的CMOS工艺,阈值电压约为0.5V的器件模型.Hspice仿真结果表明:直流增益为60dB,单位增益带宽为5.4MHz,功耗为138μW.

关键词: 模拟集成电路, 衬底驱动, 弱反型, 运算放大器

Abstract: In oder to meet the needs of the low voltage-low power circuit application, a full differential amplifier operating at the 0.5V power supply with bulk inputs is introduced. A prototype was designed in a standard 0.18μm CMOS process using 0.5V threshold voltage devices. This amplifier uses the bulk driven as the input stage and the subthreshold operating device as the output stage. The two stages have their own local common mode feedback. Simulation results indicate that this amplifier has a 60dB DC gain, a 5.4MHz gain-bandwidth and consumes 138μW.

Key words: analog integrated circuits, bulk driven, weak inversion, operational amplifiers

中图分类号: 

  • TN722.5+7