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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：This amplifier is employed after the SNR or signal-to-noise ratio is substantial & really should be reduced by Pretty much 50% although energy is Improved.He even hits on th