Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multifunctional high-frequency circuit capabilities of ambipolar carbon
  nanotube FETs   An experimentally-calibrated carbon nanotube compact transistor model has
been used here to design two high-frequency (HF) circuits with two different
functionalities each: a phase configurable amplifier (PCA) and a frequency
configurable amplifier (FCA). The former design involves an in-phase amplifier
and an inverting amplifier while the latter design embraces a frequency doubler
as well as a distinct inverting amplifier. The specific functionality selection
of each of the two HF circuit designs is enabled mainly by the inherent
ambipolar feature at a device level. Furthermore, at a circuit level the
matching networks are the same regardless the operation mode. In-phase and
inverting amplification are enabled in the PCA by switching the gate-to-source
voltage (VGS) from -0.3 V to 0.9 V while the drain-to-source voltage (VDS)
remains at 3 V. By designing carefully the matching and stability networks,
power gains of 4.5 dB and 6.7 dB at 2.4 GHz for the in-phase and inverting
operation mode have been achieved, respectively. The FCA, in its frequency
doubler operation mode, exhibits 20 dBc of fundamental-harmonic suppression at
2.4 GHz when an input signal at 1.2 GHz is considered. This frequency doubler
functionality is enabled at VGS=0.3 V, whereas at VGS=0.9 V amplification of
4.5 dB is obtained while VDS remains at 3 V in both cases. In both configurable
circuits the stabilization and matching networks are the same regardless the
bias-chosen operation mode. The circuits performance degradation due to
metallic tubes in the device channel is studied as well as the impact of
non-ideal inductors in each design. PCA and FCA operation modes are further
exploited in high-frequency modulators.

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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: hep-lat