一种宽带频率综合器快速自动频率校准技术  

A Fast AFC Technology for Wideband Frequency Synthesizer

作　　者：谢靖[1] 陈侃松[1] 王德志[2] 蒋碧波[1] 

机构地区：[1]湖北大学计算机与信息工程学院,武汉430062 [2]湖北大学物理与电子科学学院,武汉430062

出　　处：《微电子学》2015年第6期743-746,750,共5页Microelectronics

基　　金：湖北大学校基金资助项目(095181)

摘　　要：提出了一种新型快速自动频率校准技术,应用于宽带频率综合器的频带搜索和频率锁定过程。该自动频率校准模块通过直接控制频率综合器中压控振荡器(VCO)的开关电容阵列的闭合状态来调节VCO的振荡频率,实现快速锁定输出频率的目的。这种自校准技术由纯数字电路实现,校准过程只需5个时钟周期即可完成,时钟信号直接使用外部输入的参考时钟,具有算法简单、所需时钟周期少的优点。电路采用SMIC 0.18μm CMOS工艺进行设计和验证,相比以往的校准技术,其校准时间明显减少。A new fast automatic frequency calibration （AFC） technology was proposed, which was applied in the frequency band search and frequency locking process of wideband frequency synthesizer. The AFC module controlled directly the state of switch capacitor array to adjust the frequency of VCO, so as to lock the output frequency. The AFC technology was implemented by pure digital circuit. It needed only five clock cycles to finish the calibration process, and the clock signal used directly the reference frequency signal. The circuit was designed and verified with SMIC 0. 18μm CMOS process. Compared with the previous calibration technologies, this one had the advantages of simple algorithm and less clock cycles required, consequently, the calibration time was significantly reduced.

关 键 词：自动频率校准 频率综合器 压控振荡器 锁相环 CMOS 

分 类 号：TN74[电子电信—电路与系统]