NF Noise Figure 噪音指数 ; 噪声系数
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。
As the first stage of the system, its gain, noise figure(NF) and linearity directly take effect on the whole circuit.
由于是整个电路系统的第一级，其增益、噪声、线性度等直接影响整个电路系统的性能。
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