基于单片机的波形发生器.docVIP

PAGE 18 PAGE III 基于单片机的波形发生器 摘要 波形发生器是实验室常见的一种虚拟仪器，它是一种用于产生标准信号的电子仪器，随着科学技术的发展，对它的要求越来越高。在工业生产和科学研究中，波形发生器的输出信号可以用来测量元件的性能和参数，也可以用来验证指标，调整参数，评价电工电子产品的性能。大多数常用的波形发生器由模拟电路组成。当模拟波形发生器用于低频信号输出时，RC值往往很大，不仅难以保证参数的精度，而且体积和功耗也很大。数字电路构成的低频波形发生器，虽然其低频性能良好。但是，量大，价格贵。因此，高精度、宽幅度调制、低价格将成为数字波形发生器的发展趋势。 本文以AT89C52为核心，结合DAC0832程序控制，产生四种常用的低频信号：正弦波、三角波、方波和锯齿波。键盘控制可以产生方波、锯齿波、三角波和正弦波，键盘输入可以快速改变波形和频率，达到人机交互的目的。同时，在液晶屏上可显示相应波的名称和频率。其设计简单，性能优良。它可以在许多需要低频信号源的地方使用。具有一定的实用性。 关键词：单片机；三角波；锯齿波；正弦波；方波 Waveform Generator Based on Single Chip Microcomputer Abstract Waveform generator is a common virtual instrument in laboratory. It is an electronic instrument used to produce standard signals. With the development of science and technology, the requirement for waveform generator is getting higher and higher. In industrial production and scientific research, the output signal of waveform generator can be used to measure the performance and parameters of components, as well as to verify the index, adjust the parameters and appraise the performance of electrical and electronic products. Most of the commonly used waveform generators are composed of analog circuits. When this kind of analog waveform generators are used for low frequency signal output, the RC value is often very large. This makes it difficult to guarantee the accuracy of parameters, and the volume and power consumption are very large. The low frequency waveform generators composed of digital circuits, although their low frequency performance is good, but their volume is large and the price is expensive, therefore, they are of high precision. Degree, wide amplitude modulation and low price will become the development trend of digital waveform generator. In this paper, AT89C52 as the core, combined with DAC0832 program control to generate four commonly used low-frequency signals: sine wave, triangle wave, square wave and sawtooth wave. Square wave, sawtooth wave, triangle wave and sine wave can be generated by keyboard control, and the