Title :
Development of Digital FLL System for SQUID Using Double Counter Method
Author :
Oyama, D. ; Kobayashi, K. ; Yoshizawa, M. ; Yoshinori, U.
Author_Institution :
Iwate Univ., Iwate
Abstract :
Digitally controlled flux-locked loop (FLL) system using two counters (double-counter method) is proposed. In conclusion, the double-counter method increases the dynamic range and slew rate of the very low cost D-FLL system. It was also showed the characteristic of the D-FLL system by measuring magnetocardiogram waveform in a large magnetic noise condition.
Keywords :
SQUIDs; magnetocardiography; SQUID; digital FLL system; double counter method; flux-locked loop system; magnetic noise; magnetocardiogram waveform; Counting circuits; Digital signal processors; Dynamic range; Feedback loop; Frequency locked loops; Magnetic flux; Magnetic noise; Microcontrollers; Noise measurement; SQUIDs;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.374845
