Recent Progress in Analog Circuits Based on Two-Dimensional Semiconductors

Aggressive device scaling has begun to pose potential problems to the analog performance of silicon transistors,in which the intrinsic gain,one of the most important analog metrics,degrades as the technology node scales down.Two-dimensional (2D) semiconductors have attracted extensive research interests due to pristine surface and atomic body thickness,which allows excellent gate electrostatic control and is immune to short channel effect,resulting in constantly flat output curves for high output impedance and high intrinsic gain.Hence,a considerable amount of effort has been devoted to achieving analog circuits with two-dimensional semiconductors.In this paper,we review the recent progress of analog circuits based on two-dimensional semiconductors.We first discuss the performance metrics that are widely used in analog circuits.Then,we focus on various reported approaches for 2D single-stage amplifiers with basic operation,contact engineering and complementary approaches.Next,more complex circuits based on 2D semiconductors (current mirror,operational amplifier,radio frequency circuit) are discussed.Finally,the application prospect and key challenges of analog circuits based on 2D transistors are discussed.