Abstract
This paper proposed an improved fractional-N frequency synthesizer with the VCO control voltage ripple compensated. By adding a tracking feedback loop, it aims to reduce lock time and spurs. The design of fractional-N frequency synthesizer is based on a 180nm CMOS technology with 1.8V supply voltage, with the output frequency range of 699MHz-960MHz and power consumption of 2.504mW. The simulation results show that the frequency-hopping locking time of the proposed frequency synthesizer system is 2us. Compared with the traditional frequency synthesizer, the locking time is reduced by 58%, and voltage ripple is decreased by 51%.
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