【摘要】 采用直接频率信号合成器(DDS)与单片机(MCU)相结合的方法,以AD9850为频率合成器、AT89S52单片机为进程控制和任务调度的核心,设计了一个信号频率和幅度都能预置、频率稳定度优于10-6的函数信号发生器。详细介绍了DDS基本原理、系统方案构成、硬件电路设计和软件设计。通过严格的实测数据分析表明该设计是可运行的。更多还原

【Abstract】 The way is used which combines the Direct Digital Synthesizer(DDS) and Main Computational Unit(MCU) to design a function signal generator.It uses AD9850 as Frequency Synthesizer and it uses AT89S52 MCU as a core which can realize process control and task assignment.The generator can establish signal frequency and amplitude in advance.The stable parameter is better than 10-6.The principle and system components of DDS is introduced.It also introduces the methods which design the hardware circuit and software.It shows a success design by the data which come from the strict experiments.更多还原