0.4-5.8 GHz SiGe-MMIC Quadrature Modulator Employing Self Current Controlled Mixer for Cognitive Radio. - Shintaro Shinjo; Fumiki Onoma; Koji Tsutsumi; Noriharu Suematsu; Mitsuhiro Shimozawa; Hiroshi Harada (IEICE Trans. Commun., 2009)