LOW-NOISE MICROWAVE-FREQUENCY SYNTHESIZERS DESIGN PRINCIPLES
LOW-NOISE MICROWAVE-FREQUENCY SYNTHESIZERS DESIGN PRINCIPLES
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DOI：
10.1049/ip-h-1.1983.0086
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发表时间：
1983-01-01
期刊：
影响因子：
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通讯作者：
KROUPA, VF
中科院分区：
文献类型：
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作者：
KROUPA, VF
在本文中，我们首先回顾了相当一般的锁相环系统的基本相位噪声方程，并提出了它们关于输出频率的平方的归一化。以这种方式，即使在复杂的频率合成器的情况下，也可以始终使用一个和相同的数字来进行噪声频谱的图解，因为归一化将所有源带到它们的频率乘法或除法不变噪声功率谱密度。此外，我们还讨论了低通锁相环滤波器中产生的热噪声的影响，并强调了三阶二类环路对低噪声设计的重要性。通过两个例子说明了理论上的发现。
In the present paper we have first recalled the basic phase-noise equations for a fairly general PLL system, and suggested their normalisation with respect to the square of the output frequency. In this way it is possible to proceed with a graphic solution for the noise spectrum, even in cases of complicated frequency synthesisers, using one and the same figure throughout, since the normalisation brings all sources to their frequency multiplication or division invariant noise power spectral densities. Further, we discuss the influence of the thermal noise, generated in low-pass PLL filters, and emphasise the importance of third-order type-2 loops for low-noise design. Theoretical findings are illustrated by two examples.