正在研究fractionl-N PLL的噪声问题,请帮忙下载几篇文献:
1)Phase noise cancellation for a Σ-Δ fractional-N PLL employing a sample-and-hold element L.Liu 2005
2) Analytical model and behavioral simulation approach for a ΣΔ fractional-N synthesizer employing a sample-hold element
3) A newphase noise cancelling technique for fractional-N PLL 2013