一种应用于锁相环的线性化电荷泵电路  

A Linearization Charge Pump Circuit Applied to PLL

作　　者：吴炎辉 张孝勇 王兰 张陶 兰庶 刘永光[1] 李家祎[1] 徐骅 WU Yanhui;ZHANG Xiaoyong;WANG Lan;ZHANG Tao;LAN Su;LIU Yongguang;LI Jiayi;XU Hua(The 24th Research Institute of China Electronics Technology Group Corporation,Chongqing 400060,P.R.China)

机构地区：[1]中国电子科技集团公司第二十四研究所,重庆400060

出　　处：《微电子学》2021年第4期505-510,共6页Microelectronics

基　　金：国家重大科技专项基金资助项目(2017XXXX)。

摘　　要：采用0.18μm SiGe BiCMOS工艺,设计了一种线性化电荷泵电路,并对线性化电荷泵原理进行了分析。基于采样保持原理的充放电电路,配合特定时序逻辑电路,实现了较优的电荷泵线性化和锁相环鉴相杂散性能。该线性化电荷泵用于锁相环的闭环测试。结果表明,与非线性化电荷泵相比,闭环100 kHz频偏处相位噪声性能提升了9 dB;与传统线性化电荷泵相比,鉴相杂散性能提升了12.05 dB。A linearization charge pump was designed in a 0.18μm SiGe BiCMOS process,and the principle of this linearization charge pump was analyzed.By using a charging and discharging circuit based on sample-and-hold principle,and combined with a specific sequential logic circuit,the charge pump achieved the linearization and low fpfd spur of PLL.This linearization charge pump was applied to a PLL,and the measurement results of PLL showed that the phase noise@100 kHz offset frequency was improved by 9 dB compared with that of nonlinearity charge pump,and the fpfd spur was improved by 12.05 dB compared with that of conventional linearization charge pump.

关 键 词：电荷泵 鉴频鉴相器 锁相环 

分 类 号：TN433[电子电信—微电子学与固体电子学]