范文编号:DZXX113 范文字数:13780,页数:39 摘 要 信号发生器是一种常用的信号源,广泛地应用于电子电路、自动控制系统和教学实验等领域。目前使用的信号发生器大部分是利用分立元件组成的,但该类信号发生器体积大,可靠性差,准确度低。本系统是基于AT89S52单片机控制的信号发生器,在单片机上加外围器件独立式键盘,通过键盘控制波形频率的增减以及波形的选择,并用LED显示频率大小。文中阐述了国内外信号发生器的发展现状,主要讨论基于AT89S52控制的信号发生器,介绍了单片机各管脚的功能设置和单片机小系统电路的连接,还介绍了常用的几种波形发生器的方案并进行了比较,并重点论述了基于AT89S52控制的信号发生器方案,包括其原理图、功能模块图、硬件电路图,并针对设计过程中出现的问题提出了抗干扰设计的解决方案。在系统总体方案设计中,将信号发生器分成5个模块: 键控模块、单片机模块、信号发生模块、模拟信号调整模块、显示模块,按模块进行软硬件设计,对具体实现电路进行详细的分析和设计。最后根据本信号发生器的主要功能进行了系统功能测试,并根据具体测试波形和测试数据对结果进行了分析。
Signal-generator is a kind of signal source in common use, broadly applied at the electronics electric circuit, auto control system and teaching experiment etc. The system is based on single chip AT89S52 control signal generator, variety wave-form, the period of wave can be controlled by procedure, at outer circle spare part of the machine, plus independence type keyboard , which can control wave increase or decrease of form-frequency and the choice of wave-form, at the same time LED display frequency size. In this paper, the development status of signal generator in abroad and our country is told, and discusses the plan of the signal generator based on the controlling of AT89S52, also introduces and compares several kinds of waveform plan of signal generator, Importantly talks about the plan of the signal generator which is based on the AT89S52’s controlling, including schematic diagram, pictures of Functional modules, hardware circuit diagram, proposes plan to sovle anti-interference design for the difficulties in designing. In the design of system’s overall scheme, I divide the signal generator into five modules: keyboard module, SCM module, signal generating module, analog signals adjusting module, display module, and design the software and hardware according to every modules, detailed think about and design the specific circuit. In the end, this paper carries out to test system’s functionality basing on the signal generator’s main functionality, also explains the result basing on the waveform and data. Keywords:AT89S52、Signal、Interference
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