A coupled DC SQUID with low 1/f noise
作者： H. Seppa , M. Kiviranta , A. Satrapinski , L. Gronberg , J. Salmi
DOI: 10.1109/77.233329
关键词: Condensed matter physics 、 Equivalent circuit 、 Electromagnetic coil 、 Inductance 、 SQUID 、 Physics 、 Electrical impedance 、 Noise (electronics) 、 Low frequency 、 Josephson effect
摘要: A low-noise coupled DC superconducting quantum interference device (SQUID) especially optimized for low frequency is discussed. Using large Josephson junctions and a loop inductance the contribution of critical current fluctuation to 1/f noise can be minimized. To minimize are placed in center washer close SQUID loop. scaled-up copper model signal coil used analyze impedance affected by coil. An equivalent circuit describing effective as function design appropriate damping resonances. The characteristics smooth performance does not markedly suffer from at 1 Hz found about 5*10/sup -7/ Phi /sub 0// square root Hz. >
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