[简易低频信号源系统.doc

摘 要 单片机应用十分广泛，具有广泛的使用价值。低频信号发生器作为一种常用的信号源，广泛应用于电子电路、自动控制和科学研究等领域。它是一种为电子测量和计量工作提供符合严格技术要求的电信号设备，因此是电子测试系统的重要部件，是决定电子测试系统性能的关键设备。本设计要求输出信号的频率较低，因此使用了单片机作为控制器使用单片机作为控制器，用中断查表法完成波形数据的输出，再用D/A转换器输出规定的波形信号。方波信号直接由单片机的端口输出。结合功能要求情况，使用80C51单片机作为控制器，用DAC0832作为D/A转换器。功能按键使用单片机的3个端口。通过软/硬件访真实验表明该电路输出频率有较好的稳定性，而且电路使用的元器件比较常见，价格低廉，电路设计方便。。 关键词：控制器 D/A转换器 单片机 信号源 Abstract In this paper the function signal occurrence machine is a kind of in common use signal source, extensively be apply in electronics electric circuit, automatic control and sciences to study etc. realm .It is a kind of to measure and calculate the equipments telecommunication that the work provides to meet the strict technique request for the electronics, so is the important parts of the electronics test system, is a key equipments that decides the electronics test system function .It with show a machine, electric voltage form, frequency to account etc. the instrument is similar is the most common and the most basic, also is to get one of the most extensively applied electronics instruments .This design requests to output the frequency of the signal lower, so used a machine to be a machine of the controller usage to be the controller, with the exportation that the interruption checks the watch method to complete a form data, then use the D/ A conversion the machine outputs a form signal .A signal is output by the port of a machine directly .Combine the function requests the circumstance, using a machine of 80C51 to be the controller, being the conversion machine of D/ A with the DAC0832.The function key uses 3 ports of a machine .Can make the exportation frequency compared good of stability, a machine piece is more familiar, the price is cheap, the electric circuit design convenience. Keywords: A machine of the controller D/ A conversion machine signal source 目 录 摘 要 I Abstract II 目 录 III 1引 言 1 2 总体方案论证与设计 2 3系统电路设计 4 3.1 系统控制电路 4 3.1.1 D/A转换部分 4 3.1.2 DAC0832简要介绍 4 3