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The nonlinear feature upon which the device is b ased is extremely sharp and has a low resistance, if any. Therefore, good amplification and noise characteristics may be obtained.
English (United States)
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Parametric Amplifier or Mixer Based on the Flux Quantization in a Thin
Walled SuperConducting Cylinder
The nonlinear feature upon which the device is b ased is extremely sharp
and has a low resistance, if any. Therefore, good amplification and noise
characteristics may be obtained.
McLachlan (Phys. Rev. Lett. 23, 1434 (1969)) observed that the AC
susceptibility of a thin-walled (t<Lambda) hollow superconducting microcylinder
exhibits a series of "paramagnetic" spikes as a function of magnetic field. These
spikes occur at .5 H, 1.5 H, 2.5 H ---, where H = Phi(o)/cross-sectional area of
the cylinder. A sketch of the results obtained is shown in Fig. 1, which shows a
trace of the AC signal or magnetic susceptibility Chi as a function of H applied or
H outside with spikes 13 in AC susceptibility.
Fig. 2 is a schematic diagram of a system with a lockin amplifier 20. The
system includes an AC primary coil 21, a superconducting cylinder 22, an AC
secondary coil 23, an input coil 24, and a DC field feedback coil 25 in concentric
cylinders of decreasing size. Additional input coils are connected via line 26 to
input coil 24. The AC input 30 of amplifier 20 is connected via line 28 to
secondary coil 23. The DC output 31 of amplifier 20 is connected via line 29 to
coil 25. he AC output 32 of amplifier 20 is connected via line 27 to AC primary
The system shown In Fig. Q can lock the system onto one of the spikes 13 by
feeding the output of the phase-sensitive detect...