Radiofrequency amplifier based on a dc superconducting quantum interference device
US4585999A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1984 |
| Grant date | Apr 29, 1986 |
| Priority date | — |
| Expiry date | Apr 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/855
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.