Two-Tone Response in Superconducting Quantum Interference Filters

We successfully exploit the parabolic shape of the dc voltage output dip around B = 0 of a superconducting quantum interference filter (SQIF) to mix weak external r f signals. The two-tone response of weak time harmonic electromagnetic fields has been detected on the spectral voltage output of the S...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2007-06, Vol.17 (2), p.722-725
Hauptverfasser:	Caputo, P., Tomes, J., Oppenlander, J., Haussler, Ch, Trauble, T., Schopohl, N.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Arrays Derivatives Direct current Disturbances. Regulation. Protection Electric potential Electrical engineering. Electrical power engineering Electrical power engineering Electromagnetic fields Electronics Exact sciences and technology Frequency Interference Josephson junctions Magnetic fields Power harmonic filters Power networks and lines Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Shape Spectra SQIF SQUIDs Superconducting devices Superconducting filters Superconductivity Time factors Voltage Voltage fluctuations
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Beschreibung
Zusammenfassung:	We successfully exploit the parabolic shape of the dc voltage output dip around B = 0 of a superconducting quantum interference filter (SQIF) to mix weak external r f signals. The two-tone response of weak time harmonic electromagnetic fields has been detected on the spectral voltage output of the SQIF at frequency f 0 = f 1 - f 2 , for various frequencies f 1 and f 2 ranging from few MHz up to 20 GHz. The two-tone response is a characteristic function of static magnetic field B and of bias current I b , related to the second derivative of the dc voltage output.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2007.898036