A 4 : 1 Transmission-Line Impedance Transformer for Broadband Superconducting Circuits

We present a 4 : 1 superconducting transmission-line impedance transformer for cryogenic applications. The device transforms 25 Ω in the coplanar waveguide to 6.25 Ω in the microstrip and is designed to operate at 20 mK. Calibrated measurements in a dilution refrigerator demonstrate a -3 dB bandwidt...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 2012-10, Vol.22 (5), p.1500606-1500606
Hauptverfasser:	Ranzani, L., Spietz, L., Popovic, Z., Aumentado, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Bandwidth Blocking Calibration Capacitors Circuits Coplanar waveguides Dielectric, amorphous and glass solid devices Electrical engineering. Electrical power engineering Electronic equipment and fabrication. Passive components, printed wiring boards, connectics Electronics Exact sciences and technology Impedance Impedance matching Niobium Noise levels Refrigerators Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices SQUIDs Superconducting devices Superconducting microwave devices Superconductivity Transformers Transformers and inductors
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Beschreibung
Zusammenfassung:	We present a 4 : 1 superconducting transmission-line impedance transformer for cryogenic applications. The device transforms 25 Ω in the coplanar waveguide to 6.25 Ω in the microstrip and is designed to operate at 20 mK. Calibrated measurements in a dilution refrigerator demonstrate a -3 dB bandwidth from 1.6 to 13 GHz. In a modified Ruthroff design, a small capacitor is integrated at the input as a direct-current block, making it suitable for biasing and matching to low-impedance active circuits, such as superconducting quantum interference device (SQUID) amplifiers.
ISSN:	1051-8223 1558-2515
DOI:	10.1109/TASC.2012.2202116