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Three-Gigahertz Graphene Frequency Doubler on Quartz Operating Beyond the Transit Frequency

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8 Author(s)
Ramón, M.E. ; Microelectron. Res. Center, Univ. of Texas at Austin, Austin, TX, USA ; Parrish, K.N. ; Chowdhury, S.F. ; Magnuson, Carl W.
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We demonstrate a 500-nm graphene frequency doubler with a record 3-GHz bandwidth, exceeding the device transit frequency by 50%, a previously unobserved result in graphene, indicating that graphene multiplier devices might be useful beyond their transit frequency. The maximum conversion gain of graphene ambipolar frequency doublers is determined to approach a near lossless value in the quantum capacitance limit. In addition, the experimental performance of graphene transistor frequency detectors is demonstrated, showing responsivity of 25.2 μA/μW. The high-frequency performance of these gigahertz devices is enabled by top-gate device fabrication using synthesized graphene transferred onto low capacitance, atomically smooth quartz substrates, affording carrier mobilities as high as 5000 cm2/V ·s.

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Nanotechnology, IEEE Transactions on  (Volume:11 ,  Issue: 5 )