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

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Title: Boosting the voltage gain of graphene FETs through a differential amplifier scheme with positive feedback.
Authors: Grassi, R.1 rgrassi@arces.unibo.it, Gnudi, A.1 agnudi@arces.unibo.it, Di Lecce, V.1 vdilecce@arces.unibo.it, Gnani, E.1 egnani@arces.unibo.it, Reggiani, S.1 sreggiani@arces.unibo.it, Baccarani, G.1 gbaccarani@arces.unibo.it
Source: Solid-State Electronics. Oct2014, Vol. 100, p54-60. 7p.
Subjects: Electric potential, Graphene, Field-effect transistors, Differential amplifiers, Simulation methods & models, Electric capacity
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. [ABSTRACT FROM AUTHOR]
Copyright of Solid-State Electronics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 97437150
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Boosting the voltage gain of graphene FETs through a differential amplifier scheme with positive feedback.
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  Data: <searchLink fieldCode="AR" term="%22Grassi%2C+R%2E%22">Grassi, R.</searchLink><relatesTo>1</relatesTo><i> rgrassi@arces.unibo.it</i><br /><searchLink fieldCode="AR" term="%22Gnudi%2C+A%2E%22">Gnudi, A.</searchLink><relatesTo>1</relatesTo><i> agnudi@arces.unibo.it</i><br /><searchLink fieldCode="AR" term="%22Di+Lecce%2C+V%2E%22">Di Lecce, V.</searchLink><relatesTo>1</relatesTo><i> vdilecce@arces.unibo.it</i><br /><searchLink fieldCode="AR" term="%22Gnani%2C+E%2E%22">Gnani, E.</searchLink><relatesTo>1</relatesTo><i> egnani@arces.unibo.it</i><br /><searchLink fieldCode="AR" term="%22Reggiani%2C+S%2E%22">Reggiani, S.</searchLink><relatesTo>1</relatesTo><i> sreggiani@arces.unibo.it</i><br /><searchLink fieldCode="AR" term="%22Baccarani%2C+G%2E%22">Baccarani, G.</searchLink><relatesTo>1</relatesTo><i> gbaccarani@arces.unibo.it</i>
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  Data: <searchLink fieldCode="JN" term="%22Solid-State+Electronics%22">Solid-State Electronics</searchLink>. Oct2014, Vol. 100, p54-60. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Electric+potential%22">Electric potential</searchLink><br /><searchLink fieldCode="DE" term="%22Graphene%22">Graphene</searchLink><br /><searchLink fieldCode="DE" term="%22Field-effect+transistors%22">Field-effect transistors</searchLink><br /><searchLink fieldCode="DE" term="%22Differential+amplifiers%22">Differential amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Simulation+methods+%26+models%22">Simulation methods & models</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+capacity%22">Electric capacity</searchLink>
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  Label: Abstract
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  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Solid-State Electronics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.sse.2014.07.003
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        Text: English
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      – SubjectFull: Field-effect transistors
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      – SubjectFull: Differential amplifiers
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      – SubjectFull: Electric capacity
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              Text: Oct2014
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