现代电子技术Issue(9)：73-76,4.
锁相环有源滤波器设计及其对参考杂散的影响
Design of phase-locked loop active filter and its effect on reference spur
方明志 1佘世刚 1周毅 1马沛1
作者信息
- 1. 兰州空间技术物理研究所，甘肃 兰州 730000
- 折叠
摘要
Abstract
To satisfy the need of high-frequency and high-quality local oscillators in modern communication,a different ac-tive loop filter was designed by making use of the relationship between time constants and component values of active loop filter. The ADS simulations of PLLs consisted of the designed active loop filter were performed to study the suppression effect of PLL composed of different active filters to reference spur. It is found that PLLs consisted of the first-order and the second-order active filter with a loop bandwidth of 50 KHz have reference spur suppression of 34.09 dB and 45.64 dB at a specific frequency offset point,and PLLs consisted of the third-order and the forth-order active loop filter with a loop bandwidth of 100 KHz have reference spur suppression of 51.77 dB and 58.37 dB at the same specific frequency offset point. The study shows that high order PLL can suppress reference spurs better at wider loop bandwidth.关键词
有源环路滤波器/高阶锁相环/参考杂散/ADS仿真Key words
active loop filter/high-order PLL/reference spur/ADS simulation分类
信息技术与安全科学引用本文复制引用
方明志,佘世刚,周毅,马沛..锁相环有源滤波器设计及其对参考杂散的影响[J].现代电子技术,2014,(9):73-76,4.
