This article presents a low-voltage high-transconductance input differential pair for bulk-driven amplifiers. The proposed structure employs two bulk-driven flipped voltage follower (FVF) cells as nonlinear tail current sources to enhance the slewing behavior. This method also increases the transconductance of the proposed amplifier two times against the conventional one. The enhanced topology is merged with a conventional bulk-driven input differential pair using cross-coupled connections to significantly increase the transconductance. These circuitry ideas lead to an improvement in the amplifier's specifications, such as dc gain, slew rate (SR), and input noise without any degeneration in other parameters. Moreover, thanks to the use of the bulk terminals as the input nodes and also a simple common-source structure as the second stage, rail-to-rail input, and output swings are achieved, respectively. The proposed amplifier was fabricated in TSMC 0.18- μm CMOS technology. Under a supply voltage of 0.5 V, the measurement results show that the proposed amplifier achieves a dc gain of 78 dB, a gain bandwidth of 7.5 kHz, and an SR of 8.6 V/ms with just 91-nA current dissipation.

中文翻译：

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用于低压批量驱动放大器的增强型输入差分对


本文介绍了一种用于大容量驱动放大器的低压高跨导输入差分对。所提出的结构采用两个体驱动翻转电压跟随器（FVF）单元作为非线性尾电流源以增强回转行为。该方法还将所提出的放大器的跨导增加到传统放大器的两倍。增强型拓扑与传统的大容量驱动输入差分对合并，使用交叉耦合连接来显着增加跨导。这些电路理念改进了放大器的规格，例如直流增益、转换速率 (SR) 和输入噪声，而其他参数没有任何退化。此外，由于使用大容量端子作为输入节点以及简单的共源极结构作为第二级，分别实现了轨到轨输入和输出摆​​幅。所提出的放大器采用 TSMC 0.18μm CMOS 技术制造。在 0.5V 电源电压下，测量结果表明，所提出的放大器可实现 78dB 的直流增益、7.5kHz 的增益带宽和 8.6V/ms 的 SR，且电流耗散仅为 91nA。