关于信号发生器的参数

您好，我以前曾问过类似的问题，但未能得到令人满意的答案（也许我没有这么清楚地提出这个问题）。
至于功率放大器，有1dB压缩点规范，它定义了PA饱和的位置。
建议在其线性区域使用PA。
我的问题是，信号发生器有类似的参数吗？
我注意到，对于我们当前可用的模型，当输出水平接近其上限时，会出现未消除的消息。
换句话说，为了在频率f = 400MHz产生相同的信号，输出功率P = 15dBm。
以下哪项是首选？
（a）SG 400MHz，输出= 15dBm（b）SG 400MHz，输出= -25dBm，加上40dB功率放大器，我想它将强烈依赖于PA规范。
什么规格。
在查看PA的规格时，这将是最重要的。
片？
如果没有规格。
表格是否可用，有什么简单的方法可以使用频谱分析仪检查信号质量吗？
对不起，我的问题相当笼统，请原谅我提出这个天真的问题。
非常感谢您的帮助！
你的，伊柳



     以下为原文

  Hello, all

I have asked similar questions before, however failed to get satisfying answer (maybe I was not delivering the question so clearly).

As for power amplifier, there is the 1dB-compression point specification, which defines where the PA saturates. It is recommended to use the PA in its linear region.

My question is, does signal generator has similiar parameters? I noticed that for our current available model, when the output level is close to its upper limit, unleveled message occurs.  

In other words, for the generation of same signal at frequency f=400MHz, output power P=15dBm. Which of the following would be preferred?

(a) SG 400MHz, output=15dBm
(b) SG 400MHz, output=-25dBm, plus a 40dB power amplifier

I guess it would be strongly dependent on the PA specifications. What specs. would be most important when viewing the PA's spec. sheet? If no spec. sheet is available, are there any simple method to check the signal quality using the spectrum analyzer?

Sorry that my question is rather general and please forgive me for raising this naive question.  

Your help would be highly appreciated!

Yours,
Yiliu