外文翻译基于C8051单片机的双相信号发生器软件设计

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the brief introduction of traditional signal generator(原文1)abstract in the 21st century, the signal generator has obtained

2、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, research in various fields.

3、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 introductionsignal is a generator

4、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 qualitative analysis of th

5、e 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 power, the circuit is relativ

6、ely 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 technology, by discrete components

7、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 pose a simulator of the circ

8、uit 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 functions of the signal generato

9、r, 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 frequency is low, mainly by the cpu

10、 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.2 the classification of sig

11、nal generatorwith 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,

12、 thereby expanding the signal processing equipment , increase the accuracy of the measurement signal, accuracy and speed of transformation, the analog signal processing to overcome the many shortcomings, digital signal generator then developed.signal generator is widely used, the wide variety. first

13、 of all, can signal generator at gm and dedicated two categories, the main signal generator dedicated to a particular measurement purposes of development, such as the television signal generator, pulse code signal generator, and so on. this generator is subject to the characteristics of the object m

14、easured by the constraints of the request. secondly, the output waveform signal generator can be divided into sine wave signal generator, pulse-wave signal generator, function generator and arbitrary wave generator, and so on. once again, according to a frequency of methods can be divided into reson

15、ant and synthesis of the two. traditional use of the resonant signal generator, which uses a frequency selective circuit to generate sine vibration, to obtain the necessary frequency. but can also synthesis technology to obtain the necessary 9 - rate. frequency of use of technology into the signal g

16、enerator, often referred to as synthetic signal generator.3 the implementation methods of signal generatorthe realization of the function signal generator method usually have the following kinds: (1) the components with division: it is usually function generator single function generator and frequen

17、cy is not high, its work is not very stable, not easy debugging. (2) can be made by the transistor, the op-amp ic etc, more universal device is made with special function signal generator ic produce. early function signal generator ic, such as l8038, ba205, xr2207/2209 etc, the functions of them les

18、s, precision, frequency cap 300khz, unable to produce only higher frequency of signal, adjust the way also not enough flexibility, frequency and occupies emptiescompared to cannot independent regulation, both affecting each other. (3) use monolithic integrated chip function generator: can produce va

19、rious waveform, achieve the high frequency, and easy to debug. in view of this, the american beauty developed a new generation letter icmax038 function signal generator, it overcomes the (2) chip shortcomings, can achieve higher technical index, is the chip deficits. max038 frequency and high accura

20、cy, good, therefore it is called a high-frequency precision function signal generator ic. in pll, vco, frequency synthesizer, pulse width omdulatros etc circuit design, selection of devices are max038.author: g.dai, k.ahmetnationality: britishsource: http: / / / download / file20122关于传统

21、信号发生器的简介(译文1)摘要在21世纪的今天，信号发生器获得了广泛的应用和快速的发展信号发生器作为电子技术领域中最基本的电子仪器，广泛应用于航空航天测控、通信系统、电子对抗、电子测量、科研等各个领域中。它能满足测试系统的多种要求，成为了系统综合测试中不可缺少的组成部分。而且，随着科技进步，信号发生器作为普遍的实验信号源，在当今的电子实验设计中起到了举足轻重的作用。1 简介信号发生器是一种最悠久的测量仪器，早在20年代电子设备刚出现时它就产生了。随着通信和雷达技术的发展，40年代出现了主要用于测试各种接收机的标准信号发生器，使信号发生器从定性分析的测试仪器发展成定量分析的测量仪器。同时还出现了

22、可用测量脉冲电路或用作脉冲调制器的脉冲信号发生器。由于早期的信号发生器机械结构比较复杂，功率比较大，电路比较简单，因此发展速度比较慢。直到1964年才出现第一台全晶体管的信号发生器。自60年代以来信号发生器有了迅速的发展，出现了函数发生器，这个时期的信号发生器多采用模拟电子技术，由分立元件或模拟集成电路构成，其电路结构复杂，且仅能产生正弦波、方波、锯齿波和三角波等几种简单波形，由于模拟电路的漂移较大，使其输出的波形的幅度稳定性差，而且模拟器件构成的电路存在着尺寸大、价格贵、功耗大等缺点，并且要产生较为复杂的信号波形则电路结构非常复杂。自从70年代微处理器出现以后，利用微处理器、模数转换器和数模

23、转换器，硬件和软件使信号发生器的功能扩大，产生比较复杂的波形。这时期的信号发生器多以软件为主，实质是采用微处理器对dac的程序控制，就可以得到各种简单的波形。软件控制波形的一个最大缺点就是输出波形的频率低，这主要是由cpu的工作速度决定的，如果想提高频率可以改进软件程序减少其执行周期时间或提高cpu的时钟周期，但这些办法是有限度的，根本的办法还是要改进硬件电路。2 信号发生器的分类随着现代电子、计算机和信号处理等技术的发展，极大促进了数字化技术在电子测量仪器中的应用，使原有的模拟信号处理逐步被数字信号处理所代替，从而扩充了仪器信号的处理能力，提高了信号测量的准确度、精度和变换速度，克服了模拟信

24、号处理的诸多缺点，数字信号发生器随之发展起来。信号发生器的应用非常广泛，种类繁多。首先，信号发生器可以分通用和专用两大类，专用信号发生器主要为了某种特殊的测量目的而研制的，如电视信号发生器、脉冲编码信号发生器等。这种发生器的特性是受测量对象的要求所制约的。其次，信号发生器按输出波形又可分为正弦波信号发生器、脉冲波信号发生器、函数发生器和任意波发生器等。再次，按其产生频率的方法又可分为谐振法和合成法两种。一般传统的信号发生器都采用谐振法，即用具有频率选择性的回路来产生正弦振荡，获得所需频率。但也可以通过频率合成技术来获得所需9-率。利用频率合成技术制成的信号发生器，通常被称为合成信号发生器。3

25、信号发生器的实现方法函数信号发生器的实现方法通常有以下几种：（1）用分立元件组成的函数发生器：通常是单函数发生器且频率不高，其工作不很稳定，不易调试。（2）可以由晶体管、运放ic等通用器件制作，更多的则是用专门的函数信号发生器ic产生。早期的函数信号发生器ic，如l8038、ba205、xr2207/2209等，它们的功能较少，精度不高，频率上限只有300khz，无法产生更高频率的信号，调节方式也不够灵活，频率和占空比不能独立调节，二者互相影响。（3）利用单片集成芯片的函数发生器：能产生多种波形，达到较高的频率，且易于调试。鉴于此，美国美信公司开发了新一代函数信号发生器icmax038，它克服

26、了（2）中芯片的缺点，可以达到更高的技术指标，是上述芯片望尘莫及的。max038频率高、精度好，因此它被称为高频精密函数信号发生器ic。在锁相环、频率合成器、脉宽调制器等电路的设计上，max038都是优选的器件。作者：g. dai, k. ahmet国籍：英国出处：/download/file20121the basic principle of dds signal generator (原文1)1 the basic operation principle of dds signal generatordirect digital frequency s

27、ynthesis is using digital technology, through the phase change speed control, directly to produce all sorts of different frequency signal a frequency synthesis method. it mainly consists of phase accumulators, sine rom table, d/a converter and low-pass filter composition. reference clock by a stable

28、 fr produced crystal oscillator. phase by n a accumulator adder and n a phase registers cascade constitute, similar to a simple adder each to a clock pulse, the adder will frequency control data with the accumulation of the phase registers output data addition, the addition phase results of the data

29、 sent to phase register input. phase registers adder on will be produced when the clock function of the new phase data feedback to adder input, in order to make adder next clock under the effect of frequency control data to continue with added. so, phase accumulators in reference clock, under the ac

30、tion of linear phase accumulate, when phase accumulators when accumulated full amount can produce a spill, completing a cyclical movements, this cycle is a frequency signal dds synthesis, accumulators spillover periodic frequency is the signal frequency dds output. in reference to the clock fr under

31、 the control of frequency control word of accumulators tired to get the corresponding phase data, put this data as sampling address to addressing sine rom table phase - amplitude transform at a given time, can determine the output waveform amplitude. dac will digital quantity forms of wave amplitude frequency convert the required forms an analog synthesis, low-pass filter used in signal sampling filter doesnt need to get weight, so determined by frequency control word continuous variation of the output sine wave.because the output by spurious frequency largest nyquist s