CAJ | 학술논문

主要介绍以AT89C51单片机为核心部件的低频信号发生器的设计方法及工作原理。系统采用单片机扩展外部存储器和DAC接口技术，简化了仪器硬件设计。通过波形选择电路读取波形信号经离散化处理之后的波代码，并通过D/ A 转换，还原成所需要的波形。通过改变存储器输出波代码的速度来调节输出信号的频率，改变放大器的放大倍数来调节输出信号的幅值。此外还讨论了波形离散化处理方法及数据采样点数与存储容量的关系，并给出了系统结构图和软件框图。
주요개소이AT89C51단편궤위핵심부건적저빈신호발생기적설계방법급공작원리。계통채용단편궤확전외부존저기화DAC접구기술，간화료의기경건설계。통과파형선택전로독취파형신호경리산화처리지후적파대마，병통과D/ A 전환，환원성소수요적파형。통과개변존저기수출파대마적속도래조절수출신호적빈솔，개변방대기적방대배수래조절수출신호적폭치。차외환토론료파형리산화처리방법급수거채양점수여존저용량적관계，병급출료계통결구도화연건광도。
The design approach and working principle of a low-frequency signal generator based on AT89C51 are intro-duced. The hardware design was simplified by using external memory extended with SCM and DAC interface technology. The wave code after discretization processing of waveform signal is read out though a waveform selection circuit,and reverted to the needed waveform by the D/A converter. The output signal frequency is adjusted by changing the wave code output speed of the memory. The amplitude is adjusted by changing the magnification of the amplifier. The waveform discretization processing method, and the relation between data sampling number and storage capacity are discussed. The system structure chart and software flow chart are given.