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使用PLTS进行时域测量不确定Step是什么意思?

572 PLTS step
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嗨,我正在使用PLTS进行时域测量
附件是我得到的测量结果,但我不确定这张图中的Step(18.97ps)是什么意思?
我可以改变这一步吗?
怎么样?
谢谢。
SNEdited:sn_lee于2012年9月3日上午12:01发布

以上来自于谷歌翻译


     以下为原文

  Hi,

I'm using PLTS for time Domain measurement.
Attached file is the measurement result that I get, but I'm not sure what is Step (18.97ps) in this picture means?
Can I change the step? How?

Thanks.

SN

Edited by: sn_lee on Sep 3, 2012 12:01 AM   
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2019-4-2 12:59:01   评论 分享淘帖 邀请回答
2个回答
步长是resposne的时间增量。
它是时间跨度除以点数。
分辨率约为1 /频率跨度,因此任何比该数字窄的步骤实际上都是结果的插值。
您可以这样思考:分辨率告诉您可以看到的最大坡度或上升时间;
如果您的时间跨度足够小,因此步长小于重新生成,则该步骤表示由分辨率限制的平滑响应。

以上来自于谷歌翻译


     以下为原文

  Step is the time increment of the resposne.   It is the time span divided by the number of points.  

the resolution is about 1/frequency span, so any step narrower than that number really is an interpolation of the results.  You can think about it this way:

The resolution tells you the maximum slope or rise time that you can see; if you your time span is small enough so the step is smaller than the resoultion, the step represents a smoothed response limited by resolution.
2019-4-2 13:16:07 评论

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Hello SN:在PLTS中,我们插入freq域数据以确保IFFT之前的(freq start = freq步骤)。
在你的情况下,freqStart = 0.01GHz,freqStop = 26.5GHz,NOP = 201,freqStep =(26.5 - 0.01)/ 200 = 0.13245GHz插值后,freqStart = 0.13245GHz,freqStep = 0.13245GHz,freqStop = 26.5GHz,NOP =
floor((26.5 - 0.13245)/0.13245 + 1)= 200来自IFFT的时域数据实际上在原始测量中有200个点而不是201个点。
时间步长=(3.78 - 0)/ 199 = 0.01899ns = 18.99ps,非常接近你看到的18.97ps。
0.02ps差异的原因是时间停止略小于3.78,我们将其四舍五入为3.78(2位数)。

以上来自于谷歌翻译


     以下为原文

  Hello SN:

In PLTS, we interpolate the freq domain data to ensure the ( freq start = freq step) before IFFT. In your case,
freqStart = 0.01GHz, freqStop = 26.5GHz, NOP = 201, freqStep = (26.5 - 0.01) / 200 = 0.13245GHz

After interpolation,
freqStart = 0.13245GHz, freqStep = 0.13245GHz, freqStop = 26.5GHz, NOP = floor((26.5 - 0.13245) / 0.13245 + 1) = 200

The time domain data from IFFT actually has 200 points rather than 201 points in your original measurements. The time step = (3.78 - 0) / 199 = 0.01899ns = 18.99ps, very close to the 18.97ps you saw. The reason for the 0.02ps difference is that the time stop is a little smaller than 3.78, we round it to 3.78 for 2 fractional digits.
2019-4-2 13:32:21 评论

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