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Design of a Gm-C complex filter based on a simple frequency tuning circuit
ZHONG Lun-Gui, YANG Hai-Gang, LIU Fei, GAO Tong-Qiang, CHENG Xin
中国科学院大学学报 . 2011, (2): 235 -240 .  DOI: 10.7523/j.issn.2095-6134.2011.2.015