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Uncertainty of Out-of-Band Distortion Measurement With a Spectrum Analyzer

机译：频谱分析仪进行带外失真测量的不确定性

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摘要

In broadcasting and wireless communications, modulated signals are deformed by nonlinear radio frequency components, of which power amplifiers are the most significant example. The resulting distortion can leak outside the main signal band, and this leak, called out-of-band (OOB) distortion, can be directly measured with a spectrum analyzer (SA). Little attention has been paid to this measurement. In particular, it is often assumed that there is no measurement uncertainty, regardless of the condition of the instrument. However, in this paper, we show that the measurement of OOB distortion depends strongly on the various setting parameters of the SA because of its intricate internal signal processing for detection and visualization. Our analysis reveals that the underlying reason for this dependence is the difference between envelope amplitude statistics detected inside and outside of the main signal band.
机译：在广播和无线通信中，调制信号会因非线性射频分量而变形，其中功率放大器是最重要的例子。产生的失真会泄漏到主信号频带之外，这种泄漏称为带外（OOB）失真，可以使用频谱分析仪（SA）直接测量。对此测量很少关注。特别是，通常假定无论仪器的状态如何，都没有测量不确定度。但是，在本文中，我们表明，OOB失真的测量在很大程度上取决于SA的各种设置参数，因为它对检测和可视化进行了复杂的内部信号处理。我们的分析表明，这种依赖性的根本原因是在主信号带的内部和外部检测到的包络幅度统计之间的差异。

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