Beilstein J. Nanotechnol.2020,11, 1484–1491, doi:10.3762/bjnano.11.131
-electron-mobility transistor (HEMT); HEMT amplifier; microwave cryogenic amplifier; microwave superconducting circuit readout; superconductingqubitreadout; Introduction
Quantum microwave devices are widely used for different applications ranging from radio astronomy [1][2][3] to quantum information
heterojunction bipolar technology (HBT). Recently, it has been shown that cryogenic amplifiers based on SiGe HBT [16][17][18] can provide low noise levels and high gain at 4 K. They are suitable for superconductingqubitreadout [25][26] and radio astronomy systems [12][14].
In order to obtain high gain values
equivalent noise temperature and high gain. Therefore, it is suitable for the superconductingqubitreadout.
The main parameters in Table 1 were obtained for the optimum working points for each amplifier stage with the following operating drain currents: Id1 = Id2 = 3.3 mA, Id3 = 5.8 mA, Id4 = 6 mA
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Figure 1:
Schematic of the 6–12 GHz cryogenic LNA. The important component values are: C1 = 0.6 pF, C2 = 0.3 ...