[问答]

怎么使用N9923A进行放大器阻抗匹配测量

问答对人有帮助，内容完整，我也想知道答案 0 大家好，任何善良的灵魂都可以帮助我吗？我正在使用N9923A fieldfox（带选项122）来测量放大器输入阻抗和输出阻抗匹配。切换到史密斯圆图，在连接DUT之前在两根电缆的末端执行适当的校准，并开始以4 S参数测量。我能够得到S11和S21的结果非常令人满意。但是，对于S22和S21，我想知道我会偏置放大器吗？这是因为我可以在放大器关闭时接近50欧姆，并且在给放大器加电后阻抗值会发生变化。在放大器开启的情况下测量S22是否会导致内部噪声导致结果不稳定？感谢任何人都有处理放大器输出和输入阻抗测量的经验。编辑：stanleysg于2012年8月17日上午2:47 以上来自于谷歌翻译以下为原文 Hi all, any kind soul can assist me on this? i am using N9923A fieldfox ( with option 122 ) to measure my amplifier input impedance and output impedance matching. switching to smith chart, perform proper calibration at the end of both cable before connecting the DUT, and start measuring in 4 S parameter. i am able to get the result quite satisfactory for S11, and S21. however, for S22, and S21, i wonder shall i bias up the amplifier? this is because i am able to get close to 50ohm while the amplifier is turned off, and impedance value changes after powering up the amplifier. measuring S22 with the amplifier turning on will the internal noise cause the result not stable? thanks if anyone anyone has experience on dealing with amplifier output and input impedance measurement.. Edited by: stanleysg on Aug 17, 2012 2:47 AM 0
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答案对人有帮助，有参考价值 0 如果只是打开偏置就足以设置放大器的输出匹配，那么在S25和S12测量条件下进行偏置应该没有问题。放大器可能会产生波段噪声，但您可以通过提高反向测量的端口2功率或降低测量的IFBW或两者来减轻这种影响。在许多情况下，放大器不仅需要有源偏置，还需要输入端的驱动信号才能达到正常工作条件。这就是人们开始进行“热S22”测量的原因，但这需要一个FieldFox中没有的额外信号源。但是，如果您有外部源和组合器，则无法在手持设备上进行测量。您必须使用合并器进行校准并关闭外部源，并且在反向测量期间，您将打开外部源设置为CW频率，该频率与您的任何频率偏移（至少10倍IFBW）用于S22和S12测量。以上来自于谷歌翻译以下为原文 If simply turning on the bias is sufficient to set the output match of your amp, then it should be no problem making your S22 and S12 measurements under bias on condition. the amplifier might generate boradband noise, but you can mitigate that by raising the port 2 power on the reverse measurements or reducing the IFBW of the measurement or both. In many cases, amplifiers not only need their active bias, but also a driving signal at the input to reach normal operating conditions. this is why people started doing "Hot S22" measurements, but that requires an additional source which is not available in a FieldFox. However, the measurement is not impossible to make on the handheld if you have an external source and a combiner. you would have to calibrate with the combiner in place and external source turned off, and during the reverse measurement, you'll turn on the external source set to a CW frequency that is offset (by at least 10x IFBW) from any frequency you are using for the S22 and S12 measurements.

2019-5-17 16:16:23 评论举报刘华湘