With the aggressive scaling of transistor dimensions, intrinsic device gains are dropping but the need for high-gain amplifiers still exists, resulting in a great interest in multi-stage amplifiers. Most existing amplifier topologies rely on Miller capacitors which achieve stability at the expense of reduced speed. In this paper, a new state feedback compensation strategy with gain enhancement using partial positive feedback is proposed whereby a multistage amplifier can be made output-compensated, thereby requiring no Miller capacitance while being able to drive a wide range of load capacitances. After a thorough theoretical analysis, a topology prototype is fabricated in a standard 130 nm CMOS technology and is able to drive loads from 90 nF-50 nF ( $\boldsymbol {\sim 555\times }$ ) using three discrete modes. The amplifier’s power and bandwidth are scalable depending on the expected capacitive load range, with a maximum power consumption of ${\mathrm {185~ \mu \text {W} }}$ from a ${\mathrm {1~ \text {V}}}$ supply. Comparison with state-of-the-art amplifiers shows superior small-signal performance and competitive large-signal performance while driving a significantly larger range of capacitive loads.

中文翻译：

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适用于宽负载范围应用的功率调节输出补偿三级 OTA

随着晶体管尺寸的大幅缩小，固有器件增益正在下降，但对高增益放大器的需求仍然存在，从而引起了对多级放大器的极大兴趣。大多数现有放大器拓扑都依赖米勒电容器，以降低速度为代价实现稳定性。在本文中，提出了一种使用部分正反馈进行增益增强的新状态反馈补偿策略，由此可以使多级放大器进行输出补偿，从而无需米勒电容，同时能够驱动各种负载电容。经过彻底的理论分析，拓扑原型采用标准 130 nm CMOS 技术制造，能够驱动 90 nF-50 nF（ $\boldsymbol {\sim 555\times }$ ) 使用三种离散模式。放大器的功率和带宽可根据预期的容性负载范围进行扩展，最大功耗为 ${\mathrm {185~ \mu \text {W} }}$ 从一个 ${\mathrm {1~ \text {V}}}$ 供应。与最先进的放大器相比，显示出卓越的小信号性能和具有竞争力的大信号性能，同时驱动更大范围的容性负载。