一种改进的增益增强共源共栅放大器的设计  

A Gain-boost Cascode Transconductance Amplifier with Improved Structure

作　　者：马磊[1] 原义栋[1] 张海峰[1] 

机构地区：[1]中国电力科学研究院通信与用电技术分公司,北京100192

出　　处：《现代电子技术》2011年第10期145-148,共4页Modern Electronics Technique

摘　　要：设计了一种适用于流水线A/D转换器的全差分跨导放大器,通过采用单端放大器的增益增强方法,使运算放大器即具有较高的直流增益,又有较小的面积及较好的版图匹配性。通过对普通开关定容共模负反馈电路的改进,改善了建立时间减小了放大器输出共模的抖动。电路采用SMIC 0.18μm CMOS工艺,并在Cadence下对电路及版图进行了仿真,结果表明:小信号低频电压增益119.3 dB;单位增益带宽378.1 MHz;相位裕度60°。In this paper, a full differential transconductance amplifier suitable for pipelined ADC is presented. The gainboost method of the single-ended gain-boost amplifier makes the operation amplifier have a high DC gain, smaller area and better territory match in layout. By using improved CMFB circuit, the settling time and jitter of output common-mode voltage are decreased. The whole circuit was simulated with SMIC 0. 18 μm CMOS technology. The result shows that DC-gain is 119.3 dB, GBW is 378. I MHz and the phase margin is 60°.

关 键 词：流水线ADC 增益增强 跨导放大器 开关电容共模负反馈 版图 

分 类 号：TN919-34[电子电信—通信与信息系统]