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一种高性能运算放大器的设计 被引量:19

A Design of High Performance Operational Amplifier
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摘要 应用0.35μm工艺,在10mw功耗下设计了一个放大倍数为124db、单位增益带宽为233MHz(负载为2pF)的全差分运算放大器,可以同时满足一定的高速、高精度指标。其中,高的直流电压增益通过两级的cascode结构提高运放的输出电阻得到,同时,采用两个全差分运算放大器替代传统的四个单端运算放大器作为增益自举结构,而增益自举运放的共模反馈利用单MOS管来实现。仿真表明,这种新型结构的全差分运算放大器在面积、功耗以及建立时间上都优于传统的运算放大器。 A fully differential operational amplifier with a gain-bandwidth of 233MHz and a DC-gain of 124db has been implemented in a 0.35um CMOS process. The circuit utilizes the gain-enhancement technique and has a switched-capacitor dynamic common mode feedback structure. It has been designed for 2.6V output swing at a single supply of 3V. The power consumption is 10mw.
出处 《微电子学与计算机》 CSCD 北大核心 2005年第6期28-30,33,共4页 Microelectronics & Computer
关键词 运算放大器 增益自举 反馈 CASCADE Operational amplifier,Gain-boost,Feedback,Cascode
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参考文献4

  • 1Thomas Burger and Qiuting Huang. A 100db, 48MHz OTA in 0.7um CMOS for Sampled-Data Applications. Custom Integrated Circuits Conference, IEEE 1996.
  • 2KLAAS BULT and GOVERT J. G. M. GEELEN. A FastSettling CMOS Op Amp for SC Circuits with 90-db DC Gain. IEEE Journal of Solid-State Circuits, December 1990,25(6).
  • 3H. Recoules, R.Bouchakour, P. Loumeau. A Comparative Study of Two SC-CMFB Networks Used in Fully Differential OTA. IEEE 1998.
  • 4Jennifer Lloyd and Hae-Seung Lee. A CMOS Op Amp with Fully-Differential Gain-Enhancement. IEEE Transactions on Circuits and Systems-Ⅱ: Analog and Digital Signal Processing, March 1994, Vol. 41, NO. 3[5] K. Gulati, H-S.Lee. A 2. 45V-Swing CMOS Telescopic Operational Amplifier. IEEE 1998.

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