Two tone response of radiofrequency signals using the voltage output of a Superconducting Quantum Interference Filter

Details Two tone response of radiofrequency signals using the voltage output of a Superconducting Quantum Interference Filter Two tone response of radiofrequency signals using the voltage output of a Superconducting Quantum Interference Filter

2006-07-13

arxiv.org/abs/cond-mat/0607342v2

Journal of Superconductivity and Novel Magnetism, 2007

Physics

Condensed Matter

Superconductivity

10 pages, 3 Figures, submitted to J. Supercond. (as proceeding of the HTSHFF Symposium, June 2006, Cardiff)

Scientific paper

10.1007/s10948-006-0194-3

In the presence of weak time harmonic electromagnetic fields, Superconducting Quantum Interference Filters (SQIFs) show the typical behavior of non linear 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 vs. static external magnetic field B is non-periodic 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 2f_2 - f_1 is present. The experiments suggest potential applications of a SQIF as a non-linear mixing device, capable to operate at frequencies from dc to few GHz with a large dynamic range.

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