【摘要】 介绍了采用ARM芯片为主控与直接数字合成DDS组成的工频频率滑差源,详细描述工频频率滑差源的硬件结构以及程序的总体设计。飞利浦ARM9芯LPC3250做为嵌入微处理器,AD9851芯片做为输出频率调节功能,实现了各类df/dt频率滑差输出功能,结合ARM技术并通过SPI串行通信协议实现频率信号产生,软件采用基于μC/OS-II嵌入式操作系统设计。更多还原

【Abstract】 Based on ARM(Advanced RISC Machines) and DDS(Direct Digital Frequency Synthesis),Power frequency slip source hardware construction and the general design of the program are analyzed in detail.Philips ARM9 chip LPC3250 is used as the embedded microprocessor unit for control,and DDS chip AD9851 is used to output the frequency which the system requires.Various kinds of df/dt signals can be output from the power frequency slip source,SPI(Serial Peripheral Interface) technique is used to generate the frequency signal,the design of software relay on μC/OS-Ⅱ embedded operate system.更多还原