Accession Number : ADD012353

Title :   Radiofrequency Amplifier Based on a DC Superconducting Quantum Interference Device.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Hilbert,Claude ; Martinis,John M ; Clarke,John

Report Date : 29 Apr 1986

Pagination or Media Count : 8

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

Descriptors :   *PATENTS, *LOW NOISE AMPLIFIERS, *RADIOFREQUENCY AMPLIFIERS, *SUPERCONDUCTORS, *QUANTUM THEORY, AMPLIFICATION, DIRECT CURRENT, THIN FILMS, RADIOFREQUENCY, SUPERCONDUCTIVITY, SUBSTRATES, SHIELDING, INTERFERENCE, COILS, BROADBAND, TEMPERATURE, RINGS, SIGNALS, INPUT

Subject Categories : Electrical and Electronic Equipment
      Cybernetics
      Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE