Superconducting microstrip amplifiers with sub-Kelvin noise temperature near 4 GHz

M. P. Defeo, Britton Plourde

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We present measurements of an amplifier operating at 3.8 GHz with 150 MHz of bandwidth based on the microstrip input-coil resonance of a dc superconducting quantum interference device (SQUID) with submicron Josephson junctions. The noise temperature is measured using two methods: comparing the signal-to-noise ratio of the system with and without the SQUID in the amplifier chain, and using a modified Y-factor technique where calibrated narrowband noise is mixed up to the SQUID amplifier operating frequency. With the SQUID cooled to 0.35 K, we observe a minimum system noise temperature of 0.55 ± 0.13 K, dominated by the contribution from the SQUID amplifier.

Original languageEnglish (US)
Article number052603
JournalApplied Physics Letters
Volume101
Issue number5
DOIs
StatePublished - Jul 30 2012

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noise temperature
amplifiers
interference
Josephson junctions
narrowband
signal to noise ratios
coils
bandwidth

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Superconducting microstrip amplifiers with sub-Kelvin noise temperature near 4 GHz. / Defeo, M. P.; Plourde, Britton.

In: Applied Physics Letters, Vol. 101, No. 5, 052603, 30.07.2012.

Research output: Contribution to journalArticle

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