Boosting the voltage gain of graphene FETs through a differential amplifier scheme with positive feedback

R. Grassi, A. Gnudi, V. Di Lecce, E. Gnani, S. Reggiani, G. Baccarani

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)54-60
Number of pages7
JournalSolid-State Electronics
Volume100
DOIs
StatePublished - Oct 2014

Keywords

  • Differential amplifier
  • Gain enhancement
  • Graphene FET
  • Positive feedback
  • Radio-frequency operation

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