论文标题
对弗里斯噪声因子的校正
Correction to Friis Noise Factors
论文作者
论文摘要
多阶段级联网络的信噪比通常是使用Friis公式来估算噪声因子（或分贝中的噪声数字）的。在这封信中，得出了根据N级级联网络的阶段噪声因子计算阶段噪声因子和总噪声因子的正确公式。提出了我们对噪声因子的派生公式与Friis的公式的比较。与Friis在阶段噪声因子方面的总噪声因子相反，我们将N级级联网络的实际总噪声因子定义为其阶段噪声因子的乘积。
The signal-to-noise ratio of a multistage cascade network is often estimated using Friis formulas for noise factors (or the noise figures in decibel). In this letter, the correct formulas to calculate the stage-wise noise factors and the total noise factor in terms of the stage-wise noise factors of an n-stage cascade network are derived. A comparison of our derived formulas for noise factors with Friis's formulas is presented. Contrary to Friis's total noise factor in terms of the stage-wise noise factors, we define the actual total noise factor of the n-stage cascade network as the product of its stage-wise noise factors.
