This paper presents a new architecture for three-stage operational transconductance amplifiers (OTAs) with a class AB input stage to improve the slew rate. The nested Miller compensation scheme is utilized to stabilize the proposed OTA. A nonlinear current mirror in the first-stage is used to implement the class AB operation. Details of the proposed OTA are described and the circuit level simulation results are provided using HSPICE and a 90 nm CMOS technology to verify the usefulness of the proposed OTA. In comparison with the conventional class A OTA, it achieves 284.1% enhancement in the slew rate and the settling time is reduced from 15.7 ns to 9.1 ns with approximately the same power dissipation.

本文提出了一种具有AB类输入级的三级运算跨导放大器（OTA）的新架构，以提高压摆率。嵌套的米勒补偿方案用于稳定建议的OTA。第一阶段的非线性电流镜用于实现AB类操作。描述了所建议的OTA的细节，并使用HSPICE和90 nm CMOS技术提供了电路级仿真结果，以验证所建议的OTA的有效性。与传统的A类OTA相比，压摆率提高了284.1％，建立时间从15.7 ns减少到9.1 ns，而功耗几乎相同。