题目/Title：Fractional-N Frequency Synthesis: Overview and Practical Aspects with FIR-Embedded Design

作者/Author：李宇根,徐妮,周波,王志华
                        Woogeun Rhee,Ni Xu,Bo Zhou,Zhihua Wang

期刊/Journal：Journal of Semiconductor Technology and Science

年份/Issue Date：2013Apr.

卷（期）及页码/Volume（No.）&pages：Vol.13, No.2, pp. 170 - 183

摘要/Abstract：
This paper gives an overview of fractional-N phase-locked loops (PLLs) with practical design perspectives focusing on a ${\Delta}{\Sigma}$ modulation technique and a finite-impulse response (FIR) filtering method. Spur generation and nonlinearity issues in the ${\Delta}{\Sigma}$ fractional-N PLLs are discussed with simulation and hardware results. High-order ${\Delta}{\Sigma}$ modulation with FIR-embedded filtering is considered for low noise frequency generation. Also, various architectures of finite-modulo fractional-N PLLs are reviewed for alternative low cost design, and the FIR filtering technique is shown to be useful for spur reduction in the finite-modulo fractional-N PLL design.