用于高精度A/D转换器的低功耗OTA设计  

Design of Low Power OTA for High Resolution A/D Converters

作　　者：胡栋柯[1] 景新幸[1] 赵荣建[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《微电子学》2012年第3期331-335,共5页Microelectronics

基　　金：国家自然科学基金资助项目(609661002)

摘　　要：设计了一种用于高精度A/D转换器的低功耗跨导运算放大器(OTA)电路。采用全差分两级运放结构、推挽式输出及开关电容共模反馈电路。设计基于SIMC 0.18μm CMOS混合信号工艺,工作电压为1.8V。用Cadence/Spectre仿真器进行仿真,结果表明,负载为2pF时,OTA直流开环增益为63.4dB,单位增益带宽206MHz,相位裕度67°,压摆率75V/μs,功耗650μW。适用于高精度A/D转换器及其他便携式多媒体设备的低压低功耗应用。A low-power operational transconductance amplifier （OTA） for high-resolution A/D converter was designed. Fully-differential two-stage structure, push-pull output and a switched-capacitor common-mode feedback circuit were adopted in this OTA, which was fabricated with SIMC＇s 0. 18μm CMOS mixed-signal process. Results from simulation with Cadence＇s Spectre showed that the circuit had an open loop DC gain of 63. 4 dB, a unity gain bandwidth of 206 MHz, a phase margin of 67°, and a slew rate of 75%/μs for 2 pF driving load with a total power consumption of 650μW. The OTA is applicable for high-resolution A/D converter and other portable multi-media devices with low-voltage and low-power requirement.

关 键 词：跨导运算放大器 A/D转换器 CMOS 全差分 

分 类 号：TN710.2[电子电信—电路与系统]