摘要
为缩短无线通信收发系统中锁相环(PLL)的锁定时间,文中研究了锁相环中的鉴频鉴相器(PFD)和电荷泵(CP)电路模块,通过引入全新的动态PFD和推入式电荷泵,消除了盲区的同时,缩短了锁定时间。基于上述研究,设计并实现了一种基于电荷泵的快速锁定锁相环(CP-PLL)。经过测试,该CP-PLL能够快速锁定203.4~286.6 MHz范围内的信号频率,具有锁定时间短、相位噪声小、功耗较低等优点。设计可提高中高速无线通信收发系统的信道切换速度,具有良好的应用价值。
Aiming to shorten the locked time of the phase-locked loop（PLL） in the wireless communication transceiver system,the phase frequency detector（PFD） and charge pump（CP） circuit modules in the PLL are mainly researched in this paper. By introducing a new dynamic PFD and push charge pump,the blind area is eliminated and the locked time is shortened,respectively. Based on the above research,a fast locking CP-PLL is designed and implemented. It is tested that this CP-PLL can quickly lock the signal frequency in the range of 203. 4-286. 6 MHz with the advantages of low locking time,small phase noise as well as the low power consumption,which can improve the channel switching speed of the high-speed wireless communication transceiver system and have a good application value.
出处
《电子科技》
2017年第11期117-119,共3页
Electronic Science and Technology
