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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Merits of PM noise measurement over noise figure: a study at microwave frequencies
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Merits of PM noise measurement over noise figure: a study at microwave frequencies

机译：PM噪声测量优于噪声系数的优点：在微波频率下的研究

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This paper primarily addresses the usefulness of phase-modulation (PM) noise measurements versus noise figure (NF) measurements in characterizing the merit of an amplifier. The residual broadband (white PM) noise is used as the basis for estimating the NF of an amplifier. We have observed experimentally that many amplifiers show an increase in the broadband noise of 1 to 5 dB as the signal level through the amplifier increases. This effect is linked to input power through the amplifier's nonlinear intermodulation distortion. Consequently, this effect is reduced as linearity is increased. We further conclude that, although NF is sometimes used as a selection criteria for an amplifier for low-level signal, NF yields no information about potentially important close-to-carrier 1/f noise of an amplifier nor broadband noise in the presence of a high-level signal, but a PM noise measurements does. We also have verified experimentally that the single-sideband PM noise floor of an amplifier due to thermal noise is -177 dBc/Hz, relative to a carrier input power of 0 dBm
机译：本文主要介绍了相位调制（PM）噪声测量与噪声指数（NF）测量在表征放大器优点时的有用性。剩余的宽带（白色PM）噪声被用作估算放大器NF的基础。我们从实验上观察到，随着通过放大器的信号电平的增加，许多放大器的宽带噪声增加了1至5 dB。这种影响通过放大器的非线性互调失真与输入功率有关。因此，随着线性度的增加，该影响减小。我们进一步得出结论，尽管有时将NF用作放大器的低电平信号选择标准，但NF不会产生有关放大器潜在重要的接近载波的1 / f噪声或宽带噪声的信息。高电平信号，但PM噪声测量可以。我们还通过实验验证了由于热噪声引起的放大器的单边带PM本底噪声是-177 dBc / Hz，相对于0 dBm的载波输入功率

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