Radiofrequency amplifier based on a dc superconducting quantum interference device

Patent · Thu Apr 26 19:00:00 EST 1984

OSTI ID:6363096

Hilbert, C; Martinis, J M; Clarke, J

A low noise radiofrequency amplifer, 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 +- 0.5 dB has been achieved with a noise temperature of 1.0 +- 0.4 K at a frequency of 100 MHz.

• DOE Contract Number: AC03-76SF00098
• Assignee: Dept. of Energy
• Patent Number(s): None
• Application Number: ON: TI85006433
• OSTI ID: 6363096
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFIERS
DESIGN
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
RF SYSTEMS
SHIELDING
SQUID DEVICES
SUPERCONDUCTING COILS
SUPERCONDUCTING DEVICES