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- Title
Two-Tone Response of Radiofrequency Signals Using the Voltage Output of a Superconducting Quantum Interference Filter.
- Authors
Caputo, P.; Tomes, J.; Oppenländer, J.; Häussler, Ch.; Friesch, A.; Träuble, T.; Schopohl, N.
- Abstract
In the presence of weak time-harmonic electromagnetic fields, superconducting quantum interference filters (SQIFs) show the typical behavior of nonlinear mixers. The SQIFs are manufactured from high- T c grain boundary Josephson junctions and operated in active microcooler. The dependence of dc voltage output V dc versus static external magnetic field B is nonperiodic and consists of a well pronounced unique dip at zero field, with marginal side modulations at higher fields. We have successfully exploited the parabolic shape of the voltage dip around B = 0 to mix quadratically two external time-harmonic rf-signals, at frequencies f 1 and f 2 below the Josephson frequency f J, and detect the corresponding mixing signal at | f 1− f 2|. When the mixing takes place on the SQIF current–voltage characteristics, the component at 2 f 2− f 1 is present. The experiments suggest potential applications of a SQIF as a nonlinear mixing device, capable to operate at frequencies from dc to few gigahertz with a large dynamic range.
- Publication
Journal of Superconductivity & Novel Magnetism, 2007, Vol 20, Issue 1, p25
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-006-0194-3