数控锁相环频率合成器的设计与实现

Design and Realization of Digital Control Frequency Synthesizer

以低功耗微控制器P89LV51RD2为控制核心,频率合成部分采用压控振荡器和锁相环相结合的结构,既可以实现宽频率调节范围和高输出频率,又可以保证输出频率的稳定性和精确度。提出了一种高效的键盘扫描和键值处理方法,仅用四个按键完成了系统的所有输入功能,且占用系统资源少。LCD实时显示设定频率和实测频率;此外,系统还整合了USB在线下载单元,便于软件升级。最后测试各项指标达到了设计要求。

Introduce low power-cost P89LV51RD2 as the core of control in the design and realization of frequency synthesizer based on VCO and PLL,with high,wide-band,stability and precision frequency.puting forward a high efficiency keyboard scanning program,four keys are used to realize the system input function,which cost less system time.Set and test frequency are displayed on LCD in real time.USB ICP is introduced to upgrade the software.Finally,the test result meets the design requirements.