基于多路径零点消除的两级运算放大器  

Two-Stage Operational Amplifier Based on Multipath Zero Point Elimination

作　　者：卢新民 谢凌霄[1] 侯文杰 LU Xin-min;XIE Ling-xiao;HOU Wen-jie(Nanjing Electronic Device Institution,Nanjing 210016,China)

机构地区：[1]南京电子器件研究所,江苏南京210016

出　　处：《工业技术创新》2020年第6期60-66,共7页Industrial Technology Innovation

摘　　要：提出一种基于多路径零点消除的两级运算放大器结构。在简单密勒电容补偿两级运放设计基础之上,仅利用两个晶体管即实现频率补偿所需的前馈跨导级,其引入的左半平面零点提升了放大器稳定性,而且不会引入其他的寄生非主极点。与采用输入差分对作为前馈跨导级的放大器相比,结构更为简单,两个放大器的增益带宽积(GBW)分别为297 MHz和77 MHz,而且不会引入额外的输入电容和失调电压。基于SMIC 0.18μm CMOS工艺进行了流片与验证,测试验证结果与理论分析相一致。A two-stage operational amplifier based on multipath zero point elimination is proposed.Based on the design of simple Miller capacitor compensated two-stage operational amplifier,only two transistors are needed to realize feedforward transconductance stage needed in the frequency compensation.The left half plane zero point introduced improves the stability of the amplifier,and no other parasitic non-master poles are introduced.The gain bandwidth products(GBW)of the two amplifiers are 297 MHz and 77 MHz respectively,and no additional input capacitance and offset voltage are introduced.Based on the SMIC 0.18μm CMOS process,tapeout and verification are carried out,and the test results are consistent with the theoretical analysis.

关 键 词：两级运算放大器 多路径零点消除 寄生非主极点 简单密勒电容补偿 增益带宽积(GBW) 流片 

分 类 号：TP342.1[自动化与计算机技术—计算机系统结构]