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

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 ballisti...

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Bibliographic Details
Published in:Solid-state electronics 2014-10, Vol.100, p.54-60
Main Authors: Grassi, R., Gnudi, A., Di Lecce, V., Gnani, E., Reggiani, S., Baccarani, G.
Format: Article
Language:English
Subjects:
Amplification
Amplifiers
Applied sciences
Circuit properties
Circuits
Differential amplifier
Differential amplifiers
Direct current
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Gain
Gain enhancement
Graphene
Graphene FET
Positive feedback
Radio-frequency operation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Transistors
Voltage gain
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Summary: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.
ISSN:0038-1101
1879-2405
DOI:10.1016/j.sse.2014.07.003