外文翻譯基于C8051單片機的雙相信號發(fā)生器軟件設計

1、外 文 翻 譯畢業(yè)設計題目：基于c8051單片機的雙相信號發(fā)生器軟件設計原文1：the brief introduction of traditional signal generator譯文1：關于傳統(tǒng)信號發(fā)生器的簡介原文2：the basic principle of dds signal generator 譯文2：關于dds信號發(fā)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關于傳統(tǒng)

21、信號發(fā)生器的簡介(譯文1)摘要在21世紀的今天，信號發(fā)生器獲得了廣泛的應用和快速的發(fā)展信號發(fā)生器作為電子技術領域中最基本的電子儀器，廣泛應用于航空航天測控、通信系統(tǒng)、電子對抗、電子測量、科研等各個領域中。它能滿足測試系統(tǒng)的多種要求，成為了系統(tǒng)綜合測試中不可缺少的組成部分。而且，隨著科技進步，信號發(fā)生器作為普遍的實驗信號源，在當今的電子實驗設計中起到了舉足輕重的作用。1 簡介信號發(fā)生器是一種最悠久的測量儀器，早在20年代電子設備剛出現(xiàn)時它就產(chǎn)生了。隨著通信和雷達技術的發(fā)展，40年代出現(xiàn)了主要用于測試各種接收機的標準信號發(fā)生器，使信號發(fā)生器從定性分析的測試儀器發(fā)展成定量分析的測量儀器。同時還出現(xiàn)了

22、可用測量脈沖電路或用作脈沖調(diào)制器的脈沖信號發(fā)生器。由于早期的信號發(fā)生器機械結構比較復雜，功率比較大，電路比較簡單，因此發(fā)展速度比較慢。直到1964年才出現(xiàn)第一臺全晶體管的信號發(fā)生器。自60年代以來信號發(fā)生器有了迅速的發(fā)展，出現(xiàn)了函數(shù)發(fā)生器，這個時期的信號發(fā)生器多采用模擬電子技術，由分立元件或模擬集成電路構成，其電路結構復雜，且僅能產(chǎn)生正弦波、方波、鋸齒波和三角波等幾種簡單波形，由于模擬電路的漂移較大，使其輸出的波形的幅度穩(wěn)定性差，而且模擬器件構成的電路存在著尺寸大、價格貴、功耗大等缺點，并且要產(chǎn)生較為復雜的信號波形則電路結構非常復雜。自從70年代微處理器出現(xiàn)以后，利用微處理器、模數(shù)轉換器和數(shù)模

23、轉換器，硬件和軟件使信號發(fā)生器的功能擴大，產(chǎn)生比較復雜的波形。這時期的信號發(fā)生器多以軟件為主，實質(zhì)是采用微處理器對dac的程序控制，就可以得到各種簡單的波形。軟件控制波形的一個最大缺點就是輸出波形的頻率低，這主要是由cpu的工作速度決定的，如果想提高頻率可以改進軟件程序減少其執(zhí)行周期時間或提高cpu的時鐘周期，但這些辦法是有限度的，根本的辦法還是要改進硬件電路。2 信號發(fā)生器的分類隨著現(xiàn)代電子、計算機和信號處理等技術的發(fā)展，極大促進了數(shù)字化技術在電子測量儀器中的應用，使原有的模擬信號處理逐步被數(shù)字信號處理所代替，從而擴充了儀器信號的處理能力，提高了信號測量的準確度、精度和變換速度，克服了模擬信

24、號處理的諸多缺點，數(shù)字信號發(fā)生器隨之發(fā)展起來。信號發(fā)生器的應用非常廣泛，種類繁多。首先，信號發(fā)生器可以分通用和專用兩大類，專用信號發(fā)生器主要為了某種特殊的測量目的而研制的，如電視信號發(fā)生器、脈沖編碼信號發(fā)生器等。這種發(fā)生器的特性是受測量對象的要求所制約的。其次，信號發(fā)生器按輸出波形又可分為正弦波信號發(fā)生器、脈沖波信號發(fā)生器、函數(shù)發(fā)生器和任意波發(fā)生器等。再次，按其產(chǎn)生頻率的方法又可分為諧振法和合成法兩種。一般傳統(tǒng)的信號發(fā)生器都采用諧振法，即用具有頻率選擇性的回路來產(chǎn)生正弦振蕩，獲得所需頻率。但也可以通過頻率合成技術來獲得所需9-率。利用頻率合成技術制成的信號發(fā)生器，通常被稱為合成信號發(fā)生器。3

25、信號發(fā)生器的實現(xiàn)方法函數(shù)信號發(fā)生器的實現(xiàn)方法通常有以下幾種：（1）用分立元件組成的函數(shù)發(fā)生器：通常是單函數(shù)發(fā)生器且頻率不高，其工作不很穩(wěn)定，不易調(diào)試。（2）可以由晶體管、運放ic等通用器件制作，更多的則是用專門的函數(shù)信號發(fā)生器ic產(chǎn)生。早期的函數(shù)信號發(fā)生器ic，如l8038、ba205、xr2207/2209等，它們的功能較少，精度不高，頻率上限只有300khz，無法產(chǎn)生更高頻率的信號，調(diào)節(jié)方式也不夠靈活，頻率和占空比不能獨立調(diào)節(jié)，二者互相影響。（3）利用單片集成芯片的函數(shù)發(fā)生器：能產(chǎn)生多種波形，達到較高的頻率，且易于調(diào)試。鑒于此，美國美信公司開發(fā)了新一代函數(shù)信號發(fā)生器icmax038，它克服

26、了（2）中芯片的缺點，可以達到更高的技術指標，是上述芯片望塵莫及的。max038頻率高、精度好，因此它被稱為高頻精密函數(shù)信號發(fā)生器ic。在鎖相環(huán)、頻率合成器、脈寬調(diào)制器等電路的設計上，max038都是優(yōu)選的器件。作者：g. dai, k. ahmet國籍：英國出處：/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