1、 外 文 翻 译 毕业设计题目： 基于 C8051 单片机的双相信号发生器软件设计 原文 1： The brief introduction of traditional signal generator 译文 1： 关于传统信号发生器 的 简介 原文 2： The basic principle of DDS signal generator 译文 2： 关于 DDS 信号发生器的基本原理 1 The brief introduction of traditional signal generator (原文 1)Abstract In the 21st century, the signa
2、l generator has obtained a wide range of applications and rapid development of signal generator as the basic electronic instruments in the field of electronic technology, widely used in aerospace measurement and control, communications systems,electronic counter measures, electronic measurement, res
3、earch in various fields. It can meet many of the requirements of the test system, and has become an integral part of system test. Besides, with technology advanceshas, the signal generator as a general experimental source has played a pivotal role in todays electronic experimental design. 1 Introduc
4、tion signal is a generator with the longest measuring instruments, as early as the 1920s when the emerging electronic equipment it has. As the communications and radar technology development, 40 in a major test for a variety of standard receiver signal generator so that the signal generator from the
5、 qualitative analysis of the test equipment developed into a quantitative analysis of the measuring instruments. At the same time there also can be used to measure pulse circuit or pulse modulator for the pulse generator.Since the early signal generator mechanical structure more complicated, more po
6、wer, the circuit is relatively simple, relatively slow pace of development. Until 1964 there was the first all-transistor signal generator. Since the 1960s, since the signal generator with the rapid development of a function generator, this period of analog signal generator use of electronic technol
7、ogy, by discrete components or analog integrated circuits constituted, the circuit structure complicated and can only have a sine Wave, square wave, sawtooth and triangle wave, and so few simple wave, because the analog circuit drift higher, to the extent of output waveform poor stability, but also
8、pose a simulator of the circuit there is a large size, high prices, power-hungry , And other shortcomings, and to produce more complex waveforms circuit structure is very complicated. Since the 1970s a microprocessor, the use of microprocessors, ADC and DACs, hardware and software to expand the func
9、tions of the signal generator, a more complex waveforms. This time the signal generator and more software-based, is essentially a microprocessor on the DAC program control, you can get all kinds of simple wave. Waveform software control one of the greatest shortcomings of the output waveform frequen
10、cy is low, mainly by the CPU speed of the work of the decision, if you want to increase the frequency can improve the implementation of its software program to reduce cycle time or increase the CPU clock cycle, but these options are limited The fundamental approach is to improve the hardware circuit
11、. 2 The classification of signal generator With modern electronics, computers and signal processing technology, such as the development has greatly promoted the digital technology of electronic measuring instruments in the application of the original analog signal processing gradually being replaced by digital signal processing, thereby
