A method and apparatus for synthesizing high-frequency signals is disclosed that overcomes integration problem associated with prior implementations while meeting demanding phase noise and other impurity requirements. In one embodiment, a phase-locked loop (PLL) frequency synthesizer is disclosed having...http://www.google.com.hk/patents/US6304146?utm_source=gb-gplus-share專利 US6304146 - Method and apparatus for synthesizing dual band high-frequency signals for wireless communications
