信号发生器硬件电路的设计论文.doc

摘 要 本文讲述的是一个能产生正弦波、三角波、方波、锯齿波等波形的信号发生器的设计，具有连续可调的频率和幅度，同时也具有超功率报警系统。为了满足要求，这个设计是以AT89S52单片机为核心的控制芯片，其外围连接有按键电路，显示电路，D/A转换电路，运算放大电路和功率输出电路等，大致工作方式是通过按键给单片机相应的信号，单片机通过控制外围的各电路，就会在显示屏上出现相应的波形及其频率的大小，就这样实现信号发生器的功能。本设计基本上满足了所需信号发生器的要求，通过仿真与调试，所产生的波形达到了预期的结果，性能比较好。 经过测试与仿真实验，总体上来说，该设计是比较成功的，它的设计比较简单，主要由单片机来控制各个部分，与其他信号发生器相比，成本不高，但功能比较强大，性能也很稳定，能够适用于多个需要信号发生器的场合，具有很大的实用价值。 关键字：单片机，D/A转换，信号发生器，运算放大器 ABSTRACT This article is about a can produce sine wave, triangle wave, square wave, sawtooth waveform signal generator design, with continuously adjustable frequency and amplitude, but also has a super-power alarm system. In order to meet the requirements, the design is based on AT89S52 microcontroller as the core control chip, which is connected to the external key circuit, display circuit, D / A conversion circuit, operational amplifier circuits and power output circuits, etc., generally works by key corresponding to the microcontroller signal, the microcontroller each circuit by controlling the peripheral, it will appear on the display of the waveform corresponding to the size and frequency, and thus realize the function of the signal generator. This design basically meet the requirements of the desired signal generator, simulation and debugging, the resulting waveform to achieve the expected results, the performance is better. Many times through testing and simulation experiments, on the whole, this design is more successful, its design is relatively simple, mainly by the microcontroller to control various parts, compared with other signal generator, the cost is not high, but more powerful , the performance is very stable, can be applied to the signal generator to a plurality of occasions, with great practical value. Key word : MCU, D / A conversion, signal generator, operational amplifier 目 录 前 言 1 第1章 方案设计和选择 4 1.1单片机的特点 4 1.2信号发生器的概述 4 1.2.1信号发生器的分类 5 1.2.2信号发生器的现状 5 1.3 方案的设计与比较 6 1.3.1 三个方案 6 1.3.2 方案比较 6 1.4 原理与控制芯片 7 1.4.1 设计原理 7 1.4.2 控制芯片选择 7 1.5研究的内容 8 第2