ABSTRACT

A proposed ultra-high slew rate current recycling folded cascode operational transconductance amplifier (OTA) working in the subthreshold region is presented. By employing adaptive biasing and the proposed positive-feedback nonlinear current mirror techniques, it not only forces the charge or discharge path to enter the strong inversion region during slewing, but also provides an ultra-high output current, leading to a significant boost in the slew rate. The simulation results of the two OTAs designed in SMIC 0.18 $\mu$m CMOS process demonstrate that the slew rate of our proposed OTA is enhanced 387 times than that of the conventional counterpart with the same power.

摘要

提出了一种工作在亚阈值区域的超高压摆率电流循环折叠级联运算跨导放大器 (OTA)。通过采用自适应偏置和提出的正反馈非线性电流镜技术，它不仅在转换期间迫使充电或放电路径进入强反转区域，而且提供超高输出电流，从而显着提升摆率。SMIC 0.18中设计的两个OTA的仿真结果$\mu$m CMOS 工艺表明，我们提出的 OTA 的压摆率比具有相同功率的传统对应物的压摆率提高了 387 倍。