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0.4-5.2 GHz broad-band SiGe-MMIC direct conversion quadrature mixer (Q-MDC) has been developed for multi-band multi-mode cognitive radio receivers by using 0.35 mum SiGe BiCMOS process. To realize broad-band characteristic, a static frequency divider with two-stage emitter follower is used as 90 degree power divider for LO and broad-band doubly balanced mixers are used as I/Q unit mixers. The 90 degree...
4G evolution includes improvements beyond 3G as well as nomadic and mobile versions of fixed broadband wireless access (BWA) systems, such as WiFi and WiMAX. The resulting trend is technological and application convergence in an increasingly competitive marketplace. This introductory paper to the Focused Session "Convergence and Competition on the Way to 4G" concentrates on three key contributing...
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