单电容米勒补偿三级运放设计  

A Three-Stage Amplifier with Single-Miller Capacitor Compensation

作　　者：许洁皓[1] 戴庆元[1] 王任[1] 

机构地区：[1]上海交通大学微纳科学技术研究院,上海200240

出　　处：《电子器件》2009年第2期335-337,共3页Chinese Journal of Electron Devices

摘　　要：为了满足低压电路的工作要求,我们设计了一种新型的三级运放。该运放采用单电容米勒补偿与交叉多径嵌套补偿结合的方法,利用前馈通路在左半平面形成的零点来补偿其在主通路中的极点。通过使用TSMC 0.18μm工艺仿真。仿真结果表明:该运放能够获得113 dB的增益,有着87°的相位裕度,在1.8 V电源电压和120 pF负债的情况下,整体功耗只有0.534 mW。由此可见,这种新型的补偿方式能够有效地对运放进行补偿,并且使运放获得较高的增益以及较大相位裕度。A three-stage amplifier with a new compensation method was designed so as to meet the needs of low voltage circuits. This new compensation method combines the single Miller-capacitor compensation and the crossed feedforward reversed nested Miller compensation together, using the zeros formed by the feedforward path to compensate the poles in the main path. Using TSMC 0. 18um CMOS technology, the circuit has a DC gain about 113 dB, a PM of 87 degree and the power dissipation is just 0. 534 mW with a 120 pF capacitor load. The compensation is effective and the op-amp has a great gain and a large PM.

关 键 词：模拟集成电路 单电容米勒补偿 交叉多径嵌套 频率补偿 低压运放 

分 类 号：TN432[电子电信—微电子学与固体电子学]