通信工程文献翻译——摘要

信号发生器在电子测量仪器、电子电路、自动控制、雷达和其他电子系统的沟通中起着非常重要的作用,。直接数字合成(DDS)技术可以很容易地控制信号的频率波形的直接合成。本文设计了一个振幅和频率调制信号发生器，采用AD9850频率合成器和AT89S52单片机(SCM)为核心。详细的设计原理和思路进行了讨论。DDS芯片AD9850的用于生成波形。外部输入的频率数据可以通过简单的并行或串行通讯接口与单片机转化为芯片的频率相位控制字。幅度调制是由AD7520芯片实现。该系统不仅结构简单，易于实现，而且也方便，价格便宜。它具有理论和实用价值。

1.绪论

信号发生器可以作为信号源,它提供了一个已知的测试信号的电路。它可以用来测量感兴趣的参数。在各种实验测试应用程序和处理中,信号源作为激励源可以模拟各种测试信号,提供实际需要的电路[1]。

信号发生器在通信技术中，电子测量仪器、电子电路、自动控制、雷达和其他电子系统中发挥非常重要的作用。随着数字技术的飞速发展，出现了高精度数字-模拟转换器，通过使用多频技术，这是DDS技术产生一个标准的参考频率的数字控制方法[2].任意波形信号发生器能够满足复杂的字段，用户定义信号和计算机技术的结合，并使其更加精确和稳定。随着电子技术的发展现状，该信号发生器具有很大的应用。

2.系统

我们设计了一个信号发生器,可以产生任意波形。我们可以控制振幅和频率的大小,提供多种信号测试电路。

利用AT89S52微控制器，AD9850(DDS)和数模转换技术，完整的硬件和软件设计。通过键盘输入模块，我们可以调整波形的振幅和频率。波形生产的过程是通过微控制器来实现的。所以理论上我们可以编写一个程序来生成任意所需的......

Abstract 

Signal generator plays a very important role in communication, electronic measuring instruments, electronic circuits, automatic control, radar and other electronic systems. Direct Digital Synthesis (DDS) technology can easily control the frequency of the signal for direct synthesis of waveforms. This paper designed a signal generator with the amplitude and frequency modulation by using AD9850 as frequency synthesizer and AT89S52 single chip microcomputer (SCM) as the core. Detailed design principle and idea are discussed. AD9850 of the DDS chip is used to generate the waveform. The frequency data of external input can be transformed to frequency phase control words of chip by simple parallel or serial communication interface with the single chip microcomputer. Amplitude modulation is realized by the AD7520 chip. The system is not only simple in structure, easy to implement, but also convenient and cheap. It has a theoretical and practical value. 

1.Introduction  

Signal generator can be used as a signal source, which provides a known test signal to the circuit. It can be used to measure parameters of interest. In a variety of experimental test applications and processing, the signal source as the excitation source can simulate a variety of test signals, providing the practical needs to the circuit [1]. 

Signal generator play a very important role in communications, electronic measuring instruments, electronic circuits, automatic control, radar and other electronic systems. With the rapid development of digital technology, there has been high-precision digital-analog converter,digital control method by using a standard reference frequency generated by multiple frequency technology, which is the DDS technology [2]. Arbitrary waveform signal generator can meet the complex fields, user-defined signal, and the combination of computer technology......