Radiofrequency amplifier based on a dc superconducting quantum interference device

Patent · Wed Jan 01 00:00:00 EST 1986

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 (United States)
• 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

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
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