一种高增益宽频带的增益自举运算放大器  

High-Gain and Wide Bandwidth Gain-Boosting OTA

作　　者：王晋雄[1] 刘力源[1] 李冬梅[2] 

机构地区：[1]清华大学微电子研究所,北京100084 [2]清华大学电子工程系,北京100084

出　　处：《半导体技术》2010年第10期1007-1010,共4页Semiconductor Technology

基　　金："十一五"863计划重点项目(2008AA010700)

摘　　要：设计了一个应用于高精度流水线结构ADC中的高增益、宽频带全差分运算跨导放大器(OTA)。整体运放采用了2级结构,第一级采用套筒共源共栅结构,并结合增益自举技术来提高增益;第二级采用共源放大器结构作为输出级,以增大运放的输出信号摆幅。该设计采用UMC0.18μmCMOS工艺,版图面积为320μm×260μm。仿真结果显示:在1.8 V电源供电5 pF负载下,在各个工艺角及温度变化下增益高于120 dB,增益带宽积(GBW)大于800 MHz,而整个运放消耗16.36 mA的电流,FOM值为306 MHz.pF/mA。A full differential operational trans-conductance amplifier（OTA）with high wide and wide bandwidth used in pipeline ADC was presented.The optimal architecture chosen for this design consisted of two stages：the first stage employed telescopic cascode with gain-boosting technique to enhance the open loop gain;the second stage worked as output stage was chosen just a single-transistor amplifier to maximize output signal swing.The chip was fabricated in UMC 0.18 μm CMOS and the layout area is 320 μm×260 μm.The simulation results demonstrate that the open loop gain and gain-bandwidth（GBW）exceed 120 dB and 1GHz,respectively,over process and temperature variations with a 5 pF load.The OTA consumes 16.36 mA at 1.8 V supply voltage and the figure-of-merit（FOM） is 306 MHz·pF/mA.

关 键 词：增益自举 共源共栅 增益带宽积 输出摆幅 优值 密勒补偿 

分 类 号：TN432[电子电信—微电子学与固体电子学]