Open AccessStudy on transmission characteristics of matching transformer in DC superconducting quantum interference device readout
Author(s) -
Ming Liu,
Xialing Xu,
Yongliang Wang,
Jia Zeng,
Hua Li,
Qiu Yang,
Shulin Zhang,
Guofeng Zhang,
Kong Xiang-Yan,
Xiaohua Xie
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.188501
Subject(s) - transformer , physics , impedance matching , electrical engineering , optoelectronics , voltage , materials science , electronic engineering , electrical impedance , engineering
In a magnetic flux modulated DC superconducting quantum interference device (SQUID) readout, the matching transformer could realize the function of signal amplification and impedance matching, which is the key element of a low noise SQUID readout. We use a simulated DC SQUID readout to test the characteristics of matching transformer, study the transmission characteristics of transformer with different turns, and confirm its best turn ratio. In the coupling network that the transformer picks up voltage signals of SQUID, We also study the transmission characteristics of transformers with different matching capacitances, realize the matching of the parameters and the optimization in the transformer coupling network. At room temperature, for the matching transformer with a turn ratio of 1:20, when matching capacitance is 1 μF, the gain of output voltage source could reach 21.2 and its bandwidth could reach 210 kHz. Finally, in magnetic flux modulation DC SQUID readout, we evaluate the performance of the matching transformer.