TITLE

Microstrip superconducting quantum interference device radio-frequency amplifier: Effects of negative feedback on input impedance

AUTHOR(S)
Mück, M.; Hover, D.; Sendelbach, S.; McDermott, R.
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/30/2009, Vol. 94 Issue 13, p132509
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present the results of measurements of the scattering parameters of microstrip amplifiers (MSAs) based on the dc superconducting quantum interference device. The amplifier input impedance is poorly matched to typical transmission line impedances, resulting in high input return loss around -2 dB. We show that negative feedback can lower the MSA input impedance to achieve a robust match to 50 Ω. In the presence of capacitive and inductive feedback, the input return loss of the MSA can be reduced below -10 dB, opening the door to the practical use of the MSA for a variety of demanding applications.
ACCESSION #
37321879

 

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