TITLE

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

AUTHOR(S)
Spietz, Lafe; Irwin, Kent; Aumentado, José
PUB. DATE
August 2008
SOURCE
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p082506
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
34198768

 

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