说明：  在各种特定（带宽、解调S/N已定）的无线通讯系统中，能有效提高灵敏度的关键因素就是降低接收机的噪声系数NF，而决定接收机的噪声系数的关键部件就是处于接收机最前端的低噪声放大器。 低噪声放大器的主要作用是放大天线从空中接收到的微弱信号，降低噪声干扰，以供系统解调出所需的信息数据，所以低噪声放大器的设计对整个接收机来说是至关重要的
(in a variety of specific (s/N of bandwidth and demodulation has been set) wireless communication system, can effectively improve the sensitivity of the key factors is to reduce the receiver noise figure NF, and determine the key components of the noise coefficient of the receiver is in the front of the receiver, low noise amplifier. The main function of the low noise amplifier is the weak signal amplifying antenna received the air, reduce noise interference, for demodulation system required information data, so the design of low noise amplifier for the receiver is crucial.)