一种高增益高功耗效率全差分运算跨导放大器  

A High Gain and High Power Efficiency Fully Differential Operational Transconductance Amplifier

作　　者：邵子健 白春风 SHAO Zijian;BAI Chunfeng(School of Electronic Information,Soochow University,Suzhou,Jiangsu 215008,P.R.China)

机构地区：[1]苏州大学电子信息学院,江苏苏州215008

出　　处：《微电子学》2021年第6期818-821,共4页Microelectronics

基　　金：国家自然科学基金资助项目(61804104);江苏省自然科学基金资助项目(BK20180836)。

摘　　要：基于一种新型低压降、高输出电阻镜像电流源,设计了一种高增益、高功耗效率全差分运算跨导放大器(OTA)。该OTA基于0.18μm CMOS工艺设计,电源电压为1.8 V。在保证1.8V;差分输出电压摆幅的前提下,获得了较高的直流电压增益。采用NMOS管差分对作为输入的套筒式结构。结果表明,在2.3 mA偏置电流、2 pF负载电容下,该OTA具有119 dB的开环直流增益、526 MHz的增益带宽积和高达77°的相位裕度。额外加入增益提高技术后,该OTA的开环直流增益可提高到153 dB。A fully differential operational transconductance amplifier with high gain and high power efficiency was designed based on a novel mirror current source circuit with low voltage drop and high output resistance.The OTA was designed in a 0.18μm CMOS process at 1.8 V supply voltage.The higher DC voltage gain was obtained on the premise of keeping 1.8V;differential output voltage swing.The NMOS tube differential pairs was used as input sleeve structure.The results showed that the OTA had an open-loop DC gain of 119 dB,a gain bandwidth product of 526 MHz,and a phase margin up to 77°at 2.3 mA bias current and 2 pF load capacitance.The OTA’s open-loop DC gain could be increased to 153 dB when using an additional gain boost technology.

关 键 词：全差分运算跨导放大器 增益提高 宽带 高功耗效率 

分 类 号：TN722.7[电子电信—电路与系统]