Radiofrequency amplifier based on a dc superconducting quantum interference device

Patent · Tue Dec 31 19:00:00 EST 1985

OSTI ID:865831

Hilbert, Claude ^[1]; Martinis, John M ^[1]; Clarke, John ^[1]

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1. Berkeley, CA

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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
• DOE Contract Number: AC03-76SF00098
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4585999
• OSTI ID: 865831
• Country of Publication: United States
• Language: English

Related Subjects

/330/257/324/327/505/
10
100
11
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13
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19
achieved
amplified
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amplifying
applied
based
coil
conducting shield
coupled
db
dc
dc squid
dc superconducting
developed
device
element
exteriorly
frequency
frequency amplifier
frequency signal
inductively
inductively coupled
input
interference
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mhz
noise
outside
power
quantum
quantum interference
radiofrequency
radiofrequency amplifier
shield
signal
squid
superconducting
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transmitted