First please make sure the useful signal has very good SNR before you input it to amplifiers chain,then you can calculate how much gain and NF you need to get the targeted signal amplitude and noise level, based on this you can choose the right components
First please make sure the useful signal has very good SNR before you input it to amplifiers chain,then you can calculate how much gain and NF you need to get the targeted signal amplitude and noise level, based on this you can choose the right components
后才将其输入放大器链，接着计算获得目标信号振幅和噪声水平所需的增益与NF的大小，最后根据这些数据选择合适的器件设计放大器链路。