Round the feature of the ultrafast speed, make the detailed description of phase noise, receiver noise figure, launch power, threshold level of system.

围绕超高速这一特点，对系统的相位噪声、接收机噪声系数、发射功率、系统门限接收电平等作详细的论证，以确定总体设计方案。

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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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For the requirement of high gain and low noise figure (NF) of the receiver RF destination, two LNAs most be cascaded, which is determined by each noise calculation of the two different LNAs.

接收射频前端的高增益和低噪声系数要求两级低噪放级联使用，通过计算低噪放的噪声估量确定了连接方式。

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