【Key words】 frequency synthesizer； loop stability； phase noise； parameter design； equivalent noise model； noise estimation； differential charge pump； differential VCO； frequency divider； stability optimization； stability compensation； noise optimization；
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equivalent noise voltage model 等效噪声电压模型
It is proved in this paper that this equivalent noise model is neither equivalent to the original one nor measurable.
本文证明，这既不是相当于原来也没有可衡量的等效噪声模型。
Then use this model to predict equivalent continual sound level of road traffic noise, the fluence factors as the traffic flowing and the equivalent acoustic levels were output.
并运用该模型预测道路交通噪声的等效声级，把预测因子作为样本输入到网络模型，噪声等效声级作为样本输出。
Based on the equivalent circuit model of a two-port optical receiver front-end, the relationship between the equivalent input noise current spectral density and the noise figure is analyzed.
根据光接收机前端等效电路模型，建立了噪声系数与等效输入噪声电流谱密度的关系。
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