一种用于流水线ADC的CMOS运算放大器的设计  

Design of a CMOS Operational Amplifier for Pipelined ADC

作　　者：王金斗[1] 

机构地区：[1]石家庄职业技术学院,石家庄050081

出　　处：《煤炭技术》2010年第11期29-30,共2页Coal Technology

摘　　要：设计了一种全差分高速高增益的CMOS运算跨导放大器。该放大器采用了折叠式共源共栅结构,并用增益自举技术提高运算放大器的直流增益。为了实现较大的输出电压摆幅和较低的电路直流功耗,主运放采用了开关电容共模反馈。该放大器可用于10位50MHz的流水线ADC电路中。基于CSMC0.5工艺库,电源电压3.3V,仿真结果表明,在5p的负载电容下,运算放大器的增益为106dB,单位增益带宽为371MHz。A high-speed CMOS fully differential operational transconductance amplifier（OTA）is designed which is based on the folded-cascode configuration.The gain-boost technique is used to increase the DC gain of OTA.The main amplifier employs the switched capacitor common mode feedback circuit（SC-CMFB）for a lager output voltage swing and lower power consumption.The OTA can be used in a 10bit 50MHz piplined ADC.It is designed in CSMC0.5 CMOS process with 3.3V power supply,the simulation results show that the DC gain is 106dB and the unity-gain bandwidth is 371MHz.

关 键 词：跨导运算放大器 折叠式共源共栅 增益自举 开关电容共模反馈 

分 类 号：TN386[电子电信—物理电子学]