融合MSP430的便携式信号发生器设计与实现

Design of portable multi function signal generator

本文设计了以MSP430 FG4618单片机为核心的多功能信号发生器。硬件设计基于直接数字式频率合成原理,着重考虑了通过AD669产生信号的精确性和稳定性;软件设计主要说明了以键盘为中心的键操作结构,采用模块化设计实现对电路的控制,最后对频率误差进行了分析和说明。计量测试中心校准结果表明,本信号发生器适用于准确度0.25%以内、频率范围在1~50 kHz,并可根据实际应用情况选择电池或外电源供电,精度高,体积小,便于随身携带现场及野外作业应用。

This paper designs a multi function signal generator based on the MSP430FG4618 single chip microcomputer,and introduces the design of hardware and software.The design of hardware based on DDS,which focuses on produce accurate and stable signals by AD669.The software design mainly describes the structure of the key operation based on the control of keyboard and achieves the control to the circuit by modular design.Finally,the frequency error is analyzed and illustrated.CIMM calibration results show that signal generator accuracy up to 0.2% and the frequency range of 1~50 kHz which proves that the system can realize high accuracy signal output,and used in the field conditions.