Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-12-16
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 10 figures, 22 references
Scientific paper
The analytical model of the small-signal current and capacitance characteristics of RF graphene FET is presented. The model is based on explicit distributions of chemical potential in graphene channels (including ambipolar conductivity at high source-drain bias) obtained in the framework of drift-diffusion current continuity equation solution. Small-signal transconductance and output conductance characteristics are modeled taking into account the two modes of drain current saturation including drift velocity saturation or electrostatic pinch-off. Analytical closed expression for the complex current gain and the cutoff frequency of high-frequency GFETs are obtained. The model allows describe an impact of parasitic resistances, capacitances, interface traps on extrinsic current gain and cut-off frequency.
Batmanova Daria K.
Melnik Evgeny V.
Tselykovskiy Alexander A.
Zebrev Gennady I.
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