新型高增益CMOS跨导运算放大器

Novel High Gain CMOS Operational Transconductance Amplifier

为了解决在低电压、深亚微米工艺条件下获得高增益运算放大器的问题,通过引入电流倍增和分流技术,提出了一种新型高增益可调的跨导运算放大器(OTA)。在1.8V工作电源下采用0.18μm COMS标准工艺对其进行Spectre模拟,结果表明,该OTA的直流开环增益在61dB至91dB可调,最大静态功耗为434μW,最小共模抑制比为114dB。所提出的跨导运放与传统OTA相比,具有高增益和增益可调的优点,可适用于通信、电子测量,以及自动控制等系统。

A novel operational transconductance amplifier（OTA）with high and variable gain,by introducing the current multiplication and distribution technology,is proposed to solve the problem of obtaining high and tunable gain operational amplifier in a low voltage and deep sub-micron process.Under the supply voltage of 1.8V,the OTA is simulated by Spectre in 0.18μm standard COMS technology.Results show that the OTA gets a DC open loop tunable gain from 61dB to 91dB,maximum static power consumption of 434μW and minimum common mode rejection ratio of 114dB.Compared with traditional OTA,the proposed OTA has the advantages of high and variable gain,it can be applied to communication,electronic measurement and automatic control systems.