Study of PM Noise and Noise Figure in Low Noise Amplifiers Working under Small and Large Signal Conditions
Study of PM Noise and Noise Figure in Low Noise Amplifiers Working under Small and Large Signal Conditions
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小信号和大信号条件下低噪声放大器的 PM 噪声和噪声系数研究
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Portilla
中科院分区：
文献类型：
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作者：
N. Garmendia;J. Portilla
研究了低噪声放大器（LNA）在不同工作状态下的噪声性能。低噪声放大器的特点是通过测量相位调制（PM）噪声功率谱密度作为载波功率电平的函数。由输入功率引起的放大器噪声系数（NF）的退化是从残余PM白色噪声获得的。测量结果表明，低噪声放大器的噪声系数可以随着增益压缩水平的提高而显著增加。非线性工作条件下NF的增长可以解释为增益压缩本身和放大器增加的内部噪声水平的增加。本文还讨论了由放大器引入的闪烁PM噪声特性。
A study of the noise performance of low noise amplifiers (LNAs) working under different operating regimes is presented. The LNAs have been characterized through the measurement of phase modulation (PM) noise power spectral density as a function of carrier power level. The degradation of the amplifier noise figure (NF) due to input power is obtained from the residual PM white noise. Measurements show that the LNA NF can increase dramatically with the gain compression level. The growth of NF in nonlinear operating conditions can be explained due to the gain compression itself and the increasing level of the internal noise added by the amplifier. The flicker PM noise behavior introduced by the amplifier is also discussed.