Noise Analysis of Phase Locked Loops and

comsrf

ABSTRACT
This report analyzes phase locked loops from the noise point of view and discusses the
different trade-offs in designing low noise PLLs. Beginning with a first order loop, the
importance of loopbandwidth is explained. It is shown that the loopbandwidth basically
acts as a threshold when the VCO noise begins to dominate over the input noise. Higher
order loops are also analyzed to show that two basic PLL parameters: the charge pump
gain and the resistance in the loop filter can be varied for reducing the noise level at the
output. However, variation of these parameters disturb stability and frequency spectrum of
the PLL. Trade-offs in varying these parameters are discussed and a step by step PLL
design procedure is described that improves the noise performance of the PLL while maintaining
good stability and reduced reference spurs in the output power spectrum.
【文件名】:061226@52RD_fmusa_pllnoise.pdf
【格　式】:pdf
【大　小】:161K
【简　介】:
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xzyan

谢谢楼主！下来看看。

myghguo

写得还挺不错，谢谢楼主

bigdog

下来看看

walking001

看看~~~~~~~~~~~