CAJ | 학술논문

为了满足现代通信中对高频率高质量本振源的需求，采用时间常数与有源环路滤波器各元件值的关系，设计不同阶环路滤波器，并对所设计环路滤波器构成的锁相环做了ADS仿真实验；研究了不同阶有源滤波器构成的锁相环对参考杂散的抑制效果；发现50 kHz环路带宽一、二阶有源滤波器构成的锁相环对特定频偏点参考杂散抑制分别为34.09 dB与45.64 dB，100 kHz环路带宽三、四阶有源滤波器构成的锁相环对特定频偏点参考杂散抑制分别为51.77 dB与58.37 dB；结果表明高阶锁相环能在更宽环路带宽下对参考杂散有更好的抑制效果。
위료만족현대통신중대고빈솔고질량본진원적수구，채용시간상수여유원배로려파기각원건치적관계，설계불동계배로려파기，병대소설계배로려파기구성적쇄상배주료ADS방진실험；연구료불동계유원려파기구성적쇄상배대삼고잡산적억제효과；발현50 kHz배로대관일、이계유원려파기구성적쇄상배대특정빈편점삼고잡산억제분별위34.09 dB여45.64 dB，100 kHz배로대관삼、사계유원려파기구성적쇄상배대특정빈편점삼고잡산억제분별위51.77 dB여58.37 dB；결과표명고계쇄상배능재경관배로대관하대삼고잡산유경호적억제효과。
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.