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我的接收器链中有一个耦合器,我想用我测量的3端口S参数进行建模,但我需要将耦合器的影响包括在系统的噪声系数中。
如果是2端口被动丢失,我只需要使用| s21 | 对于噪声系数,并将其附加到s2p文件的末尾,就像你应该的那样。 但你不能在s3p文件中包含噪声数据。 那么如何模拟像耦合器这样的无源有损3端口器件的噪声? 以上来自于谷歌翻译 以下为原文 I've got a coupler in my receiver chain that I want to model with the 3 port S parameters that I've measured but I need to include the effect of the coupler on the noise figure of tthe system. If it were a 2 port passive loss I'd just use |s21| for the noise figure and append it to the end of the s2p file like you're supposed to. But you cant include noise data in s3p files. So how do I model the noise of a passive lossy 3 port device like a coupler? |
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如果将这个用作直通路径,Genesys仍将使用S21作为噪声系数的贡献。
如果您正在使用耦合端口(S31),这仍然是被动丢失,它将以相同的方式工作。 您根本不必将* .s2p文件附加噪声系数值 - Genesys知道这是一个无源设备,并将使用它来相应地计算对噪声系数的影响。 您只需要添加有源组件(如放大器)的噪声数据。 附加的s2p文件在*下面的文件底部有一个噪声系数数据的例子! 噪音参数*线。 为了说服自己这是真的,只需一个30dB的放大器进行简单的系统仿真并测量噪声系数。 然后在放大器前插入耦合器。 噪音数字应该增加了损失量。 请参阅随附的Genesys文件,并将其设置为全部。 关于DanEdited:dan.peabody于2014年6月30日上午2:24 ammc5024_7v200_a.s2p14.7 KB 以上来自于谷歌翻译 以下为原文 Genesys will still use the S21 as the contribution of Noise figure if this is being used as the thru path. If you are using the couple port (S31) this is still a passive loss it will work in the same way. You shouldn't have to append your *.s2p file with noise figure values at all - Genesys knows that this is a passive device and will use this to calculate the effect on noise figure accordingly. You should only need to add in noise data for active components such as amplifiers. The attached s2p file has an example of the noise figure data at the bottom of the file below the *! NOISE PARAMETERS* line. To convince yourself this is true run a simple system simulation with a just a 30dB amplifier and measure the noise figure. Then insert your coupler before the amplifier. The noise figure should have increased by the amount of loss is has. See attached Genesys file with this all set up to go. regards Dan Edited by: dan.peabody on Jun 30, 2014 2:24 AM 附件
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