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：At an functioning frequency choice of 500MHz max, the isolation benefit is not so higher. As a result, the reduction of external noise is typical and just a little lower tha