Liu Ming, Xu Xiao-Feng, Wang Yong-Liang, Zeng Jia, Li Hua, Qiu Yang, Zhang Shu-Lin, Zhang Guo-Feng, Kong Xiang-Yan, Xie Xiao-Ming. Study on transmission characteristics of matching transformer in DC superconducting quantum interference device readoutJ. Acta Physica Sinica, 2013, 62(18): 188501. DOI: 10.7498/aps.62.188501