Graphene polarity controllable amplifier and its applications
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چکیده
This paper exploits the unique ambipolar conduction property of graphene field effect transistors to realize a single transistor polarity controllable amplifier. The amplifier is polarity controllable since its small signal gain can be switched between positive and negative modes through proper biasing. Polarity controllable amplifiers can greatly simplify communication circuits in applications such as phase shift keying and phase detection that traditionally use complicated analog multipliers. The polarity controllable amplifier is validated using a reported zero-band-gap graphene transistor, with competitive performance in gain, swing, distortion, and output resistance. We propose a robust design that addresses issues of unmatched performance in gain and output DC levels in the two modes, even in the presence of non-idealities due to contact resistance and asymmetric drive currents.
منابع مشابه
Ambipolar electronics
Ambipolar conduction, characterized by a superposition of electron and hole currents, has been observed in many next-generation devices including carbon nanotube, graphene, silicon nanowire, and organic transistors. This paper describes exciting new design opportunities in both analog and digital domains, all of which are inspired by the ability to control ambipolarity during circuit operation....
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