Progress in Superconductivity
- 제7권1호
- /
- Pages.46-51
- /
- 2005
- /
- 1229-4764(pISSN)
64채널 DROS 심자도 시스템을 위한 검출 회로의 잡음 특성
Noise Characteristics of Readout Electronics for 64-Channel DROS Magnetocardiography System
- Kim J. M. (Korea Research Institute of Standards and Science) ;
- Kim K. D. (Korea Research Institute of Standards and Science) ;
- Lee Y. H. (Korea Research Institute of Standards and Science) ;
- Yu K. K. (Korea Research Institute of Standards and Science) ;
- Kim K. W. (Korea Research Institute of Standards and Science) ;
- Kwon H. C. (Korea Research Institute of Standards and Science) ;
- Sasada Ichiro (Department of Applied Science for Electronics and Materials, Kyushu University)
- 발행 : 2005.10.01
초록
We have developed control electronics to operate flux-locked loop (FLL), and analog signal filters to process FLL outputs for 64-channel Double Relaxation Oscillation SQUID (DROS) magnetocardiography (MCG) system. Control electronics consisting of a preamplifier, an integrator, and a feedback, is compact and low-cost due to larger swing voltage and flux-to-voltage transfer coefficients of DROS than those of dc SQUIDs. Analog signal filter (ASF) serially chained with a high-pass filter having a cut-off frequency of 0.1 Hz, an amplifier having a gain of 100, a low-pass filter of 100 Hz, and a notch filter of 60 Hz makes FLL output suitable for MCG. The noise of a preamplifier in FLL control electronics is