通过具有正反馈的差分放大器方案提高石墨烯FET的电压增益
Boosting the voltage gain of graphene FETs through a differential amplifier scheme with positive feedback
摘要：
我们研究了一种可能的电路解决方案，以克服短沟道石墨烯FET的低电压增益的问题。该电路由一个全差分放大器和一个由交叉耦合晶体管对构成的负载组成。从自洽弹道量子输运模拟获得的器件特性开始，我们探索电路参数空间，并评估放大器的直流电压增益和电压增益带宽方面的性能。我们发现，直流增益可以有效地提高由交叉耦合对提供的负微分电阻。接触电阻是实现太赫兹范围内的增益带宽产品的主要障碍。所提出的放大器的局限性是确定其线性度差和相对较大的米勒电容。
英文摘要：
We study a possible circuit solution to overcome the problem of low voltage gain of short-channel graphene FETs. The circuit consists of a fully differential amplifier with a load made of a cross-coupled transistor pair. Starting from the device characteristics obtained from self-consistent ballistic quantum transport simulations, we explore the circuit parameter space and evaluate the amplifier performance in terms of dc voltage gain and voltage gain bandwidth. We show that the dc gain can be effectively improved by the negative differential resistance provided by the cross-coupled pair. Contact resistance is the main obstacle to achieving gain bandwidth products in the terahertz range. Limitations of the proposed amplifier are identified with its poor linearity and relatively large Miller capacitance.
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