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LMX2582: 开环相位噪声和闭环相位噪声的区别

Part Number: LMX2582

在datasheet的第10页,看到对开环相位噪声和闭环相位噪声的对比,请问这两种噪声有什么区别呢?在实际测量中这两种噪声该如何测量?为什们闭环相位噪声曲线会有一个凸起呢?