Design and Analysis of a Gain-Enhanced,Fully Differential Telescopic Operational Transconductance Amplifier  

增益提高型套筒式全差分跨导放大器的设计与分析(英文)

作　　者：姚志健[1] 马成炎[1] 叶甜春[1] 莫太山[1] 

机构地区：[1]中国科学院微电子研究所杭州分部,杭州310085

出　　处：《Journal of Semiconductors》2008年第2期269-274,共6页半导体学报（英文版）

摘　　要：This paper describes the design and analysis of a fully differential,gain-enhanced CMOS telescopic operational transconductance amplifier （OTA） used in a pipeline analog-to-digital converter （ADC）. Specifications of the OTA are derived from the requirements of ADC. Simulation shows that for a lpF load capacitance, this OTA achieves a high DC gain （approximately 145dB） and a wide unity-gain bandwidth （above 750MHz） at a phase margin 58°. In a configuration where the closed loop-gain is 4,the design spends about 18ns for settling with 0.05% accuracy. Simulations of this design are performed in SMIC CMOS 0.18μm technology.提出了一种应用于流水线型模数转换器(ADC)的增益提高型套筒式全差分跨导放大器(OTA)的设计与分析方法.通过ADC的性能要求推导出OTA的设计指标.该设计中OTA的架构由主运放、增益辅助运放及共模反馈电路3部分子电路组成.设计采用SMIC CMOS 0 .18mm工艺平台.该设计方法的实验结果表明:1pF负载下,跨导放大器的直流增益达到145dB,单位增益带宽超过750 MHz ,相位裕度达到58°.闭环增益为4时,放大器在20ns内稳定到0 .05 %的精度.

关 键 词：OTA GAIN-BOOST CMFB 

分 类 号：TN722[电子电信—电路与系统]