The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2016
Filed:
Apr. 26, 2012
Jin Mok Kim, Daejeon, KR;
Young Ho Lee, Daejeon, KR;
Hyukchan Kwon, Daejeon, KR;
Ki Woong Kim, Daejeon, KR;
Kwon Kyu Yu, Daejeon, KR;
Jin Mok Kim, Daejeon, KR;
Young Ho Lee, Daejeon, KR;
Hyukchan Kwon, Daejeon, KR;
Ki Woong Kim, Daejeon, KR;
Kwon Kyu Yu, Daejeon, KR;
Korea Research Institute of Standards and Science, Daejeon, KR;
Abstract
Provided are a flux-locked loop circuit, a flux-locked loop method and a superconducting quantum interference device (SQUID) measuring apparatus. The flux-locked loop circuit includes a pre-amplifier configured to amplify a signal output of a SQUID, an integrator configured to integrate a signal output from the pre-amplifier and output the integrated signal, an operating range expanding unit configured to initialize the integrator by comparing an output signal of the integrator with a positive or negative reference reset voltage corresponding to an external flux of a predetermined integral multiple of flux quantum, and a feedback circuit configured to supply current to eliminate a difference between the external flux applied to the SQUID and a magnetic flux corresponding to an integral multiple of the reference reset voltage according to the output signal of the integrator.