A Spur-Reduction Frequency Synthesizer For WIMAX Applications

Abstract

A spur-reduction frequency synthesizer proposed in 0.18-um CMOS technology is developed for WIMAX applications. It incorporates a random charge pump to randomize the reference spur so as to accomplish a low spur level or a relatively smooth spectrum and a fast lock synthesizer. This frequency synthesizer achieves the phase noise of -124dBc/Hz at 1MHz offset frequency and reference spurs below -70dBc. The spur tones of the frequency synthesizer are greatly in frequency domain and the power consumption is 28mW.