噪声系数通常用于衡量一个电路和或者系统内部噪声大小，它通常用于比较不同电路或者系统噪声性能的好坏。噪声系数的定义如下： Radio telescopes integrate LNAs to seize weak electromagnetic signals from celestial bodies. These specialised amplifiers work with sound temperatures down below fifteen Kelvin to detect cosmic indicators at power levels of -one hundred thirty dBm. With no op amp, the... https://franciscoyxrkd.uzblog.net/what-does-pin-diode-switch-mean-47905842