The focus of the present study is on a recycling folded cascode (RFC) operational transconductance amplifier (OTA) in which the transconductance, as well as the slew rate of OTA, are enhanced. RFC OTA, proposed in this study, is employed using a Dynamic Threshold Voltage MOSFET (DTMOS) based differential pair with class AB operation. To achieve class AB operation, an adaptive biasing technique comprising a flip voltage follower is used which boosts the dynamic current and gain-bandwidth product of OTA. Conventional current mirrors are replaced with source degenerated non-linear current mirrors to achieve a better slew rate. The conventional and proposed RFC structures are designed and simulated in a standard 180 nm CMOS process at 1 V supply voltage. The proposed RFC OTA demonstrates a significant enhancement in the performance parameter as 11 dB improvement in the gain as well as 290% more GBW and achieves a slew rate that is nine times better compared to the conventional RFC.

本研究的重点是回收折叠共源共栅（RFC）运算跨导放大器（OTA），其中跨导以及OTA的压摆率得到了提高。这项研究中提出的RFC OTA，是使用基于动态阈值MOSFET（DTMOS）的差分对进行AB类工作的。为了实现AB类操作，使用了包括翻转电压跟随器的自适应偏置技术，该技术可提高OTA的动态电流和增益带宽积。传统的电流镜被源极退化的非线性电流镜所取代，以实现更好的压摆率。常规和建议的RFC结构是在1 V电源电压下以标准180 nm CMOS工艺设计和仿真的。