RF Spectrum of a Signal after Frequency Multiplication; Measurement and Comparison with a Simple Calculation
RF Spectrum of a Signal after Frequency Multiplication; Measurement and Comparison with a Simple Calculation
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倍频后信号的射频频谱；
DOI：
10.1109/tim.1975.4314411
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发表时间：
1975
影响因子：
5.6
通讯作者：
A. Demarchi
中科院分区：
文献类型：
--
作者：
F. Walls;A. Demarchi
引入了一种新颖的实验技术，用于测量倍频对振荡器射频频谱的影响。这项技术可以产生 X 频段的射频频谱（测量相对简单），该频谱是通过将 5 MHz 源倍频到 9.2 GHz 至 100 THz (1014 Hz) 的任何频率而产生的。开发并展示了一种简化的理论，可重现载波和噪声基座中的相对功率以及载波和噪声基座的形状和宽度的实验结果，在 5 MHz 至 10 THz 的测量不确定度内，测量不确定度为 2 或 3 dB。使用分析技术，根据源相位波动的频谱密度、有效输入频谱密度和乘法器链的带宽以及倍频因子的测量，可以轻松地进行计算。结果表明，目前的 5 MHz 晶体控制振荡器可用作~500 GHz 的精密源。建议将其范围扩大到~100 THz。
A novel experimental technique is introduced and used to measure the effect of frequency multiplication on the RF spectrum of an oscillator. This technique makes it possible to produce the RF spectrum at X band¿where measurements are relatively straightforward¿that would have been produced by frequency multiplication of the 5-MHz source to any frequency from 9.2 GHz to 100 THz (1014 Hz). A simplified theory is developed and shown to reproduce the experimental results for the relative power in the carrier and noise pedestal, and the shape and the width of the carrier and noise pedestal, to within the measurement uncertainty of 2 or 3 dB, from 5 MHz to 10 THz. The calculations are easily made using analytical techniques from the measurement of the spectral density of phase fluctuations of the source, the effective input spectrum density and the bandwidth of the multiplier chain, and the frequency multiplication factor. It is shown that present 5-MHz-crystal-controlled oscillators are useful as a precision source to ~500 GHz. Suggestions for extending their range to ~100 THz are made.