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

被引：8

作者：

Ranzani, Leonardo ^{[1
]}

Spietz, Lafe ^{[2
]}

Popovic, Zoya ^{[1
]}

Aumentado, Jose ^{[2
]}

机构：

[1] Univ Colorado, Dept Elect & Comp Engn, Boulder, CO 80309 USA

[2] NIST, Boulder, CO 80303 USA

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2012年 / 22卷 / 05期

关键词：

Impedance matching; superconducting microwave devices; transformers; DESIGN; PLANAR;

D O I：

10.1109/TASC.2012.2202116

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We present a 4 : 1 superconducting transmission-line impedance transformer for cryogenic applications. The device transforms 25 Omega in the coplanar waveguide to 6.25 Omega 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.

引用

页数：6

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