> {quote：title = glemire写道：} {quote}>你好，>> 1）我的DUT传输波形的振幅约为1V pp。一般情况下，你建议在测量具有此度数的有源设备时使用衰减器。
>大约7 dBm，应该没问题。
> 2）我的IF_BW设置为大约1kohm。
我正以10 MHz的步幅从10MHz-18GHz扫描。
这似乎是一个合理的值，但你建议使用i）平均，ii）平滑和iii）不同的IF_BW设置？
你可能意味着1kHz，而不是kohm。
除非你在测量中看到太多的噪音，否则我会推荐它。
> 3）我注意到当我减小IF_BW时，扫描需要更长的时间。
根据我的理解，减少IF_BW将减少随机噪声并降低我的本底噪声，但我不确定为什么扫描需要更长时间。
我假设IF滤波器正好位于接收器中的ADC之前。
测量采集时间为1 / BW，因此1kHz表示每点1毫秒测量。
使IF BW更小使得测量时间成比例地更长。
> 4）进行此类热测量时，您可以推荐什么？
这些热测量有点棘手。
S11始终是热测量，但通常在S22测量期间，端口1上的源关闭。
您可以联系当地的安捷伦应用工程师以获得更多信息，因为详细信息有点难以通过论坛提供。
以上来自于谷歌翻译
以下为原文
> {quote:title=glemire wrote:}{quote}
> hello,
>
> 1) the amplitude of my DUT transmitted waveform is about 1V pp. In general do you recommend using attenuators when measuring an active device with this ampitude.
>
That's roughly 7 dBm, should be OK.
> 2) I have my IF_BW set to be about 1kohm. I am sweeping from 10MHz-18GHz in 10 MHz steps. This seems to be a reasonable value, but do you recommend using i) averaging, ii) smoothing and iii) differant IF_BW setting?
You probably mean 1kHz, not kohm. It is what I would recommend unless you see too much noise in the measurement.
> 3) I notice that when I reduce the IF_BW, the sweep takes a longer time. From what i understand reducing the IF_BW will reduce the random noise and lower my noise floor, but I am not sure why the sweep would take longer. I assume the IF filter is right before the ADCs in the receiver.
The measurement acquisition time is 1/BW, so 1kHz means 1 msec measurement per point. Making the IF BW smaller makes the measurement time proportionately longer.
> 4) anything elsethat you can recommend when doing this type of a hot measurement?
These hot measurements are a little tricky. S11 is always a hot measurement, but usually during the S22 measurement, the source on port 1 is turned off.
You might contact your local Agilent Application Engineer to get more insight, as the details are bit hard to give over the forum.
> {quote：title = glemire写道：} {quote}>你好，>> 1）我的DUT传输波形的振幅约为1V pp。一般情况下，你建议在测量具有此度数的有源设备时使用衰减器。
>大约7 dBm，应该没问题。
> 2）我的IF_BW设置为大约1kohm。
我正以10 MHz的步幅从10MHz-18GHz扫描。
这似乎是一个合理的值，但你建议使用i）平均，ii）平滑和iii）不同的IF_BW设置？
你可能意味着1kHz，而不是kohm。
除非你在测量中看到太多的噪音，否则我会推荐它。
> 3）我注意到当我减小IF_BW时，扫描需要更长的时间。
根据我的理解，减少IF_BW将减少随机噪声并降低我的本底噪声，但我不确定为什么扫描需要更长时间。
我假设IF滤波器正好位于接收器中的ADC之前。
测量采集时间为1 / BW，因此1kHz表示每点1毫秒测量。
使IF BW更小使得测量时间成比例地更长。
> 4）进行此类热测量时，您可以推荐什么？
这些热测量有点棘手。
S11始终是热测量，但通常在S22测量期间，端口1上的源关闭。
您可以联系当地的安捷伦应用工程师以获得更多信息，因为详细信息有点难以通过论坛提供。
以上来自于谷歌翻译
以下为原文
> {quote:title=glemire wrote:}{quote}
> hello,
>
> 1) the amplitude of my DUT transmitted waveform is about 1V pp. In general do you recommend using attenuators when measuring an active device with this ampitude.
>
That's roughly 7 dBm, should be OK.
> 2) I have my IF_BW set to be about 1kohm. I am sweeping from 10MHz-18GHz in 10 MHz steps. This seems to be a reasonable value, but do you recommend using i) averaging, ii) smoothing and iii) differant IF_BW setting?
You probably mean 1kHz, not kohm. It is what I would recommend unless you see too much noise in the measurement.
> 3) I notice that when I reduce the IF_BW, the sweep takes a longer time. From what i understand reducing the IF_BW will reduce the random noise and lower my noise floor, but I am not sure why the sweep would take longer. I assume the IF filter is right before the ADCs in the receiver.
The measurement acquisition time is 1/BW, so 1kHz means 1 msec measurement per point. Making the IF BW smaller makes the measurement time proportionately longer.
> 4) anything elsethat you can recommend when doing this type of a hot measurement?
These hot measurements are a little tricky. S11 is always a hot measurement, but usually during the S22 measurement, the source on port 1 is turned off.
You might contact your local Agilent Application Engineer to get more insight, as the details are bit hard to give over the forum.
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