L波段低相噪、快锁定频率合成器研制

小数分频（FNPLL）频率合成器是近年来出现的一种新技术，它与传统的整数分频频率合成器相比具有频率分辨率高、相位噪声低、快速锁定等优点。用ANALOGDE．VICES公司的最新的小数分频锁相环频率合成器芯片ADF4193，设计了一个L波段锁相环频率合成器。文章系统地阐述了ADF4193的组成、工作原理，使用ADISimPLL软件进行环路滤波器设计，通过仿真得到各种性能指标，并对仿真结果和改变参数避开杂散的方法进行了详细分析。通过测试，结果证明了ADF4193组成的频率合成器具有优良的性能。

Design of L-Band Low Phase Noise,Fast Settling PLL Frequency Synthesizer

Fractional-N phase-locked loop(FNPLL) frequency synthesizer is based on a new technique appeared recently.It has the advantages of high frequency resolution,low phase noise,fast lock time when compared with the traditional Integer-N phase locked loop(NPLL) frequency synthesizer.The ADF4193 produced by AD is adopted to design a L-band Fractional-N PLL frequency synthesizer.The implementation scheme and the operation principle are expatiated on in detail.The ADF4193 loop filter design is supported on ADI SimP...