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(Color online) Simple common-source amplifier. Two signals at 193 and are applied to the input of a common-source amplifier. Because the current in the FET is a nonlinear function of the input voltage, a wide variety of different intermodulation products are visible in the output spectrum (see Table I). Each peak is labeled by the order of the derivative in the current-voltage characteristic to which it corresponds. The schematic is shown in the inset.
(Color online) Current-voltage characteristics of a carbon nanotube FET. The FET was grown on a high-resistivity silicon substrate, using the substrate as a back gate and the -thick thermally grown layer as the gate dielectric. The dots are the experimental data, with each dataset labeled by its corresponding drain-source voltage . The solid lines are the theoretical fit, which uses only two global free parameters.
Output spectrum of a nonlinear amplifier. By replacing with in Eq. (1), we obtain an infinite sequence of outputs at all frequencies , where and are integers. The sequence of ’s typically converges rapidly to zero, so in the table, we keep only terms up to order .
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