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Title: Radiofrequency amplifier based on a dc superconducting quantum interference device

Abstract

A low noise radiofrequency amplifier (10), using a dc SQUID (superconducting quantum interference device) as the input amplifying element. The dc SQUID (11) and an input coil (12) are maintained at superconductivity temperatures in a superconducting shield (13), with the input coil (12) inductively coupled to the superconducting ring (17) of the dc SQUID (11). A radiofrequency signal from outside the shield (13) is applied to the input coil (12), and an amplified radiofrequency signal is developed across the dc SQUID ring (17) and transmitted to exteriorly of the shield (13). A power gain of 19.5.+-.0.5 dB has been achieved with a noise temperature of 1.0.+-.0.4 K. at a frequency of 100 MHz.

Inventors:
 [1];  [1];  [1]
  1. Berkeley, CA
Issue Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
865831
Patent Number(s):
4585999
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03F - AMPLIFIERS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
radiofrequency; amplifier; based; dc; superconducting; quantum; interference; device; noise; 10; squid; input; amplifying; element; 11; coil; 12; maintained; superconductivity; temperatures; shield; 13; inductively; coupled; 17; signal; outside; applied; amplified; developed; transmitted; exteriorly; power; 19; db; achieved; temperature; frequency; 100; mhz; conducting shield; dc squid; quantum interference; inductively coupled; superconducting quantum; interference device; frequency signal; radiofrequency amplifier; frequency amplifier; dc superconducting; /330/257/324/327/505/

Citation Formats

Hilbert, Claude, Martinis, John M, and Clarke, John. Radiofrequency amplifier based on a dc superconducting quantum interference device. United States: N. p., 1986. Web.
Hilbert, Claude, Martinis, John M, & Clarke, John. Radiofrequency amplifier based on a dc superconducting quantum interference device. United States.
Hilbert, Claude, Martinis, John M, and Clarke, John. Wed . "Radiofrequency amplifier based on a dc superconducting quantum interference device". United States. https://www.osti.gov/servlets/purl/865831.
@article{osti_865831,
title = {Radiofrequency amplifier based on a dc superconducting quantum interference device},
author = {Hilbert, Claude and Martinis, John M and Clarke, John},
abstractNote = {A low noise radiofrequency amplifier (10), using a dc SQUID (superconducting quantum interference device) as the input amplifying element. The dc SQUID (11) and an input coil (12) are maintained at superconductivity temperatures in a superconducting shield (13), with the input coil (12) inductively coupled to the superconducting ring (17) of the dc SQUID (11). A radiofrequency signal from outside the shield (13) is applied to the input coil (12), and an amplified radiofrequency signal is developed across the dc SQUID ring (17) and transmitted to exteriorly of the shield (13). A power gain of 19.5.+-.0.5 dB has been achieved with a noise temperature of 1.0.+-.0.4 K. at a frequency of 100 MHz.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

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