基于二线制变送器的正弦信号发生器的设计  

Design of sinusoidal signal generator based on two-wire transmitter

作　　者：符长友[1] 何俊鹏[1] 

机构地区：[1]四川理工学院计算机学院,四川自贡643000

出　　处：《现代电子技术》2014年第19期63-65,共3页Modern Electronics Technique

基　　金：国家级大学生创新创业训练项目(201210622016);企业信息化与物联网测控技术四川省高校重点实验室项目(2013WZY03)

摘　　要：针对电压型变送器远距离传输信号质量差的缺点,提出了利用输入为1-2 kΩ、输出为4-20 mA的二线制电流型电阻变送器实现远距离控制DDS频率合成芯片AD9851的目标,以产生1-2 MHz的正弦信号.实验结果表明,采用二线制电流型电阻变送器能够实现远距离数据传输,电阻与频率非线性度非常理想.For the poor signal quality in remote communication of voltage transmitter,a two-wire resistance-to-current trans-mitter with its input resistance of 1~2 kΩ and its output current of 4~20 mA is proposed in this paper to control the frequency synthesis chip AD9851of direct digital synthesizer(DDS)in long distance,so as to generate a sinusoidal signal with 1~2 MHz by AD9851. The experimental results show that the two-wire resistance-to-current transmitter can realize remote data transmis-sion. Moreover,the non-linearity of resistance and frequency is perfect.

关 键 词：二线制变送器 正弦信号发生器 MSP430F149 DDS AD9851 

分 类 号：TN741-34[电子电信—电路与系统]