通信工程文献翻译——关键词：多功能;可编程；信号发生器；AD9833，RS232。

文摘：信号源和高精度可编程是现代科学的需要研究、通信系统、教学仪器、电子测量等。在报纸上，提出了一种便携式信号发生器，AT89C51单片机和可编程的DDS的核心集成芯片AD9833。本文还介绍了系统的原理和实现项目。发电机能输出正弦波，方波，三角波，直流电压，它手册和程控两个工作模式，可以通过RS232通信实现PC程控输出接口。实验表明，该系统具有精度高、范围宽，体积小、操作灵活等优点。

介绍：

高精度信号源是非常重要的科研、通信系统、电子战争和各种电子测量。随着数字化的发展技术、计算机和直接数字频率合成(DDS)技术已经成功用于高精度信号发生器的设计。这种信号发生器的优势高转换速度、精度高和全数字。与此同时，它也有一些缺点：1)高价格、低利用率，使轻易浪费资源；2)它有一个简单的函数，一般没有直流信号输出功能；3)控制模式是单一的，一般没有编程接口，不利于系统的集成和扩展。

本文介绍的多功能可编程信号发生器的核心AT89C51单片机和可编程的DDS芯片AD9833集成，它可以产生各种各样的信号，如正弦波、方波、三角波、直流电压等。该系统可以在两种模式工作手册和程序，它可以通过RS232通信接口实现PC程序输出。系统具有精度高、范围宽、体积小、成本低、灵活方便等等，有一个对市场前景相对乐观。

1、系统技术方案和设计

本文设计的信号发生器是基于AT89C51单片机和可编程的DDS芯片AD9833，它由电源系统、单片机系统、DDS波形产生模块、直流电压生成模块、振幅调整模块、继电器输出模块、显示模块、键盘模块和通信模块。采用AT89C51单片机控制器设计，implementates键盘输入、液晶显示器AD9833编程、信号幅度的调整、和PC通信等功能。

AT89C51单片机控制器优点是效率高、技术成熟、可靠、灵活、方便，价格较低，其硬件和软件资源满足设计要求。AD9833不需要外部组件，输出频率和相位可以通过软件编程，灵活和方便。频率是28位注册，时钟频率是25兆赫，0.1赫兹的准确性。直流电压源由MAX873加上外部电路设计，实现了一个可调节输出电压-10V ~ 10V。

传统操作系统终端如键盘和液晶显示屏。此外，它还与RS232接口设计，用户可以设置DDS信号类型、输出频率、初始阶段、峰间通过可编程接口。配置信息下载到单片机......

Keywords: multifunctional; programmable; signal generator; AD9833; RS232.

Abstract:Signal source with high precision and programmable is needed in modern scientific research, communication system, teaching apparatus, electronic measurement and so on. In the paper,a portable signal generator is proposed, which has a core of AT89C51 and programmable DDS integrated chip AD9833. The paper also introduces the principle and implementation of system project. The generator can output sinusoidal wave, square wave, triangle wave, dc voltage, and it has manual and SPC two working mode, can implement PC SPC output through RS232 communication interface. Experiments show that the system has advantages of high precision, wide scope, small size and flexible operation etc.

Introduction

High precision signal source is very important to scientific research, communication systems,electronic warfare and a variety of electronic measurement. With the development of the digital technology, computer and direct digital frequency synthesis (DDS) technology have been successfully used in the design of high precision signal generator. Such signal generator has the advantages ofhigh conversion speed, high precision and full digital. Meanwhile it also has some disadvantages: 1)high price, low utilization rate, causes the waste of resources easily; 2) it has a simple function,generally has not DC signal output function; 3) control mode is single, generally has not the programmable interface, not conducive to the system integration and extension.

The multifunctional programmable signal generator presented in this paper, has a core ofAT89C51 and programmable DDS integrated chip AD9833, it can produce a variety ......