High performance superconducting quantum interference device feedback electronics

Autor:	W. J. Goss, D.K. Lathrop, T. Picunko, D. Gambrel, P. J. M. Wöltgens, D. Overway, R. Wiegert, R. H. Koch, J. R. Rozen
Rok vydání:	1996
Předmět:	Physics business.industry Magnetometer Amplifier RF power amplifier Slew rate law.invention SQUID law Optoelectronics Radio frequency business Instrumentation Frequency modulation Electrical impedance
Zdroj:	Review of Scientific Instruments. 67:2968-2976
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1147082
Popis:	A dc superconducting quantum interference device (SQUID) modulation and feedback circuit operating at a modulation frequency of 16 MHz has been constructed. Using a novel wide band superconducting thin film transformer to impedance match the SQUID to a rf amplifier allows the system to operate at the SQUID noise level for most types of low‐TC SQUIDs. This system has a closed loop bandwidth exceeding 2.5 MHz and a slew rate greater than 1×106Φ0/s at frequencies up to 1 MHz. This greatly improved performance compared to existing modulation methods can be obtained without enhancing the transfer function of the SQUID. The system allows low‐ and high‐TC SQUID magnetometers and gradiometers to be operated totally unshielded without unlocking in the dc, 60 Hz, and radio frequency electromagnetic fields present in most SQUID applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::18c49fffc38712adfc55247625586673 https://doi.org/10.1063/1.1147082 Zobrazit plný text záznamu