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对于常数输入,HK-MASH结构Sigma-Delta调制器可以产生最大化序列长度,从而实现量化噪声的高效抑制,将其应用于小数N频率合成器上可以改善合成器的相噪性能。文章在分析小数N频率合成器的基础上,建立了基于HK-MASH结构的小数N频率合成器的Simulink仿真模型。通过时域仿真,分析HK-MASH结构对频率合成器输出频谱的影响。仿真结果表明,和传统MASH结构相比,基于HK-MASH结构的小数N频率合成器确实具有更小的相噪。
For constant input, the HK-MASH Sigma-Delta modulator can maximize the length of the sequence to achieve efficient suppression of quantization noise. Applying it to a fractional-N frequency synthesizer can improve the phase noise performance of the synthesizer. Based on the analysis of fractional-N frequency synthesizer, this paper establishes the Simulink simulation model of fractional-N frequency synthesizer based on HK-MASH structure. Through the time domain simulation, the influence of HK-MASH structure on the output spectrum of the frequency synthesizer is analyzed. The simulation results show that the fractional-N frequency synthesizer based on HK-MASH structure does have less phase noise than the traditional MASH structure.