【摘要】 对采用DDS(直接数字频率合成)芯片和单片机设计一种精密微型短波信号发生器进行了可行性论证。简述了其基本原理,并着重于硬件角度的描述。当输入时钟信号为12.8 MHz时,输出频率上限可达30.72 MHz。设计利用现代数字化系统的优势,应用先进的DDS专用芯片AD8951与单片机配合控制,实现了频率、相位的准确输出,可靠性高。本设计适用于通信系统和高精度仪器。更多还原

【Abstract】 In this article,the design of an accurate short wave signal generator and its principle are briefly described.And the hardware is introduced.The design is based on DDS,AT98S51,LCD,keyboard,amplifier,ROM and so on.The frequency and phase can be modified digitally.When 12.6MHz reference signal is applied,the uppermost frequency limit reaches 30.72MHz.Due to the design using DDS chip AD9851,it gives the system an excellent performance and reliability.Because of controlling of the MCU and DDS are used,the frequency and phase are very accurate. The whole system is very natty and has high reliability.The design is applicable to the associated equipments of the system and to instruments of high accuracy.更多还原