Amplifiers – With resistive-type amplifying device
Patent
1984-04-27
1986-04-29
Mullins, James B.
Amplifiers
With resistive-type amplifying device
307306, 324248, 330 68, 330250, 357 5, H03F 1900
Patent
active
045859990
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.
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Clarke John
Hilbert Claude
Martinis John M.
Clouse, Jr. Clifton E.
Gaither Roger S.
Hightower Judson R.
Mullins James B.
The United States of America as represented by the United States
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