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Graphene: Graphene Audio Voltage Amplifier (Small 3/2012)
Author(s) -
Guerriero Erica,
Polloni Laura,
Rizzi Laura Giorgia,
Bianchi Massimiliano,
Mondello Giovanni,
Sordan Roman
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201290016
Subject(s) - graphene , amplifier , materials science , transconductance , optoelectronics , transistor , bandwidth (computing) , voltage , electrical engineering , nanotechnology , computer science , telecommunications , engineering , cmos
The image shows an integrated graphene voltage amplifier, which paves the way for all‐graphene analogue electronics. Signal amplification is obtained by fabricating graphene transistors in which the top gate overlaps with the source and drain contacts. This results in full‐channel gating and therefore high transconductance at room temperature. The fabricated complementary amplifier has a voltage gain of 3.7 (11.4 dB) at 10 kHz, a total harmonic distortion in the audio frequency range of <1%, a unity‐gain frequency of 360 kHz, and a −3 dB bandwidth of 70 kHz. The obtained values demonstrate that, among other applications, the present graphene amplifier is suitable for high‐fidelity amplification of audio signals.