Input impedance and gain of a gigahertz amplifier using a dc superconducting quantum interference device in a quarter wave resonator

被引：31

作者：

Spietz, Lafe ^{[1
]}

Irwin, Kent ^{[1
]}

Aumentado, Jose ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Boulder, CO 80305 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 08期

关键词：

D O I：

10.1063/1.2970967

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Due to their superior noise performance, superconducting quantum interference devices (SQUIDs) are an attractive alternative to high electron mobility transistors for constructing ultra-low-noise microwave amplifiers for cryogenic use. We describe the use of a lumped element SQUID inductively coupled to a quarter wave resonator. The resonator acts as an impedance transformer and also makes it possible to accurately measure the input impedance and intrinsic microwave characteristics of the SQUID. We present a model for input impedance and gain, compare it to the measured scattering parameters, and describe how to use the model for the systematic design of low-noise microwave amplifiers with a wide range of performance characteristics. (C) 2008 American Institute of Physics.

引用

页数：3

共 12 条

[1]

CLARKE J, 2004, SQUID HDB, P44505

[2]

DANSTKER E, 1997, APPL PHYS LETT, V70, P2037

[3] Highly sensitive and easy-to-use SQUID sensors [J].