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This paper describes the design of a CMOS frequency synthesizer targeting wireless local area network applications in the 5 GHz range. Based on an integer-N architecture, the synthesizer produces a 5.2 GHz output as well as the quadrature phases of a 2.6 GHz carrier. Fabricated in a 0.4 /spl mu/m digital CMOS technology, the circuit provides a channel spacing of 23 MHz at 5.2 GHz while exhibiting a phase noise of -115 dBc/Hz at 2.6 GHz and -100 dBc/Hz at 5.2 GHz at 10 MHz offset. The reference sidebands are at -50 dBc at 2.6 GHz and the power dissipation from a 2.6 V supply is 47 mW.