G-J ChenH-H ChiuTAI-CHENG LEE2018-09-102018-09-102007-04http://scholars.lib.ntu.edu.tw/handle/123456789/334014A 4-Channel Poly-Phase Filter for Cognitive Radio Systemsconference paper10.1109/VDAT.2007.3732112-s2.0-34648827220