Desgin of Broadband Low Spurious Frequency Synthesizer Applied to WIFI Transceiver System
This article proposes a frequency synthesizer suitable for WIFI transceiver systems based on the 28nm CMOS process.The frequency synthesizer circuit includes frequency and phase detector,charge pump,broadband voltage controlled oscillator,programmable frequency divider and HK-MASH decimal modulator.Compared with conventional MASH structure,the HK-MASH structure has good spurious reduction ability.After testing,the fre-quency synthesizer can provide an out frequency range of 4.34GHz～6.03GHz.When the output frequency is 4.4GHz,the phase noise at frequency deviation of 10KHz can reach-95dBc/Hz,and the spurious is less than-60dB.When the output frequency is 6GHz,the phase noise at frequency deviation of 10KHz can reach-96dBc/Hz.The simulation and testing results show that this frequency synthesizer can meet the usage requirements of WIFI transceiver systems.
HK-MASHbroadband voltage controlled oscillatorfrequency synthesizer
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