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The paper presents the design and realization of frequency synthesizer based on a phase-locked loop together with frequency-doubling and fractional phase-rotating techniques. To achieve lower power design, a current-reused technique is employed on the combiner of quadrature voltage-controlled oscillator and frequency doubler and the other combiner of injection-lock frequency divider and phase rotator. The synthesizer provides the tuning range of 21.2 to 22.4 GHz and dissipates 28 mW. The measured phase noise is -106.7 dBc/Hz from 1-MHz offset.