The LNA boosts the antenna sign to beat feed line losses involving the antenna along with the receiver. To simplify the noise gain calculation, the sounds resources in The straightforward amplifier circuit in Figure 1 could be minimized to only one full RTI sound source (Vni, Overall), as shown in https://low-noiseamplifier23333.blogoscience.com/43691583/5-easy-facts-about-low-noise-amplifier-described