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1、功率放大器英文文献翻译及参考文献-英语论文功率放大器英文文献翻译及参考文献参考文献1 刘树林.低频电子线路.电子工业出版社,2003: 78-802 刘维恒.实用电子电路基础.电子工业出版社,2004: 69-71 3 刘镇宾.音像技术.机械工业出版社,2005: 54-574 谢自美.电子线路设计、实验、测试.华中理工大学出版社,2000: 107-1115 杨素行.模拟电子技术基础.高等教育出版社,2005: 212-2206 贾书圣.模拟电子线路（线性部分）.北京理工大学出版社,1996: 81-847 成 立.电子技术.北京理工大学出版社,2000: 91-958 王贺明.王成安.模拟
2、电子技术.大连理工大学出版社,2003: 74-779 蔡惟铮.电子技术基础试题精选与答题技巧.哈尔滨工业大学出版社,2000: 95-10110 郭培源.电子电路及电子器件.高等教育出版社,2004: 65-6911 何小艇.电子系统设计.杭州浙江大学出版社,2004: 70-8012 王武江.陈树凯.常用集成电路速查手册.冶金工业出版社, 2004: 105-110附录1 英文译文本文源自六维论文网功率放大器原来只是以分立元件的形式组成电路，近年来，随着科学技术的普及和文化水平的提高，功率放大器也有集成化产品，并在体育馆、影剧场、歌舞厅、家庭中的Hi-Fi音乐欣赏、AV系统放音、卡拉OK等
3、场合得到广泛应用。功率放大器是将音频电压信号放大到一定的功率并驱动扬声器发声的一种设备。功率放大器在扩声中起着极其重要的作用，如果没有功率放大器扬声器就不能扩声。功率放大器是音响装置的核心部分，无论是调谐器输出的信号，还是话筒、录音机、电唱机输出的信号，都必须经过功率放大器放大以后才能推动音箱发出声音。功率放大就是电压放大，特点如推动音频的功放；高频功率放大器如电视台雷达发射的无线电微波。功率放大器的种类繁多，但不外乎分立电路、集成电路，随着科学技术的发展，各种半导体器件的质量和数量正不断提高，应用日益广泛。由于集成功率放大器具有体积小，重量轻，成本低，安装调试简单等优点。现在，集成功率放大器
4、已取代了由分立元件组成的功率放大器。如音频功率放大器、射频功率放大器、磁功放等。本文的功率放大器将采用集成功率放大器。目前随着高保真立体声技术的普及，许多功率放大器也应用了高保真技术。高保真的意思是指音频电声系统及其设备或部件保持声音信号原来面貌的能力。对于一般家庭音响装置来说只要低音浑厚、丰满，中音坚实、有力，高音清脆明亮，能够使听者感到满意也就认为达到高保真的要求了。人在讲话的时候声音的强度是很有限的，如果在一个有成千上万人的会场中，要使每一个人都能清楚地听到是不可能的。利用功率放大器，人只要对着话筒讲话，经过功率放大器放大，再从扬声器中发出很强的声音，就可以使全会场的人都听到。人讲话的声
5、音通过话筒变成了微弱的电信号，这一信号的电压大小同声音的强弱成正比，它的频率同声音的频率相同，这种电信号叫做音频信号。有话筒得到的音频信号，电压只有几毫伏，功率放大器把这个微弱的音频信号放大，从功率放大器输出端可以输出功率达几瓦到几十瓦，以至更大的音频信号，推动扬声器，发出强大的声音。 在这一过程中，功率放大器的作用只是把音频电信号进行放大，所以功率放大器也就是音频放大器。话筒能把声音变成电信号；扬声器能把电信号变成声音。我们把这类元件叫做电声元件。功率放大器必须同电声元件配合使用，才能发挥出它的作用。功率放大电路（简称功率放大器）通常位于多级放大电路的最后一级，其任务是将前级电路放大后的电压
6、信号再进行功率放大，以足够的输出功率推动执行机构工作，如扬声器发声、电动机旋转、继电器动作、仪表指针偏转本文源自六维论文网等。功率放大电路与电压放大电路都属于能量转换电路，它们是将直流电源提供直流功率转换成被放大信号的交流功率，从而起到功率和电压放大的作用。但由于在多级放大电路中所处的位置不同，它们各自的功能是不同的：处于前置级的电压放大电路的任务是将输入的微弱信号识别出来并加以有效的放大，大多工作在低电压、小电流、低噪声的条件下，研究的主要指标是电压放大倍数、输入电阻、输出电阻、信噪比、频率特性等，它们工作时，本身消耗的功率不大，向下一级输出的主要是电压信号。1363功率放大器英文文献翻译及
7、参考文献The power amplifier is only originally by the discrete component form composition electric circuit, in recent years, along with the science and technology popularization and the cultural level enhancement, the power amplifier also had the integrated product, and in the stadium, the shade theater
8、, the song ballroom, the family Hi-Fi music appreciation, AV situations and so on system playback, Kara OK obtained the widespread application. The power amplifier is enlarges the audio frequency voltage signal to certain power and actuates the speaker sound production one kind of equipment.The powe
9、r amplifier is playing the extremely vital role in the sound amplification, if does not have the power amplifier speaker not to be able to amplify sound.The power amplifier is the acoustics core part, regardless of is the tuner output signal, the microphone, the tape recorder, the record player outp
10、ut the signal, will all have to enlarge later after the power amplifier to be able to impel the sound box to make the sound.The power enlarges is the voltage amplification, the characteristic is may lead the big load, in other words, may output the big electric current.May divide into the low freque
11、ncy power amplifier and the high frequency power amplifier according to the bandwidth.The low frequency power amplifier like impetus audio frequency merit puts; The high frequency power amplifier like television station radar launches radio microwave.The power amplifier type is many, but nothing els
12、e but establishes separately the electric circuit, the integrated circuit, along with thelow, installs the debugging simply and so on the merits.Now, the integration power amplifier has substituted for the power amplifier which is composed by the discrete component.If the audio power amplifier, the
13、radio frequency power amplifier, magnetism merit put and so on. This article power amplifier will use the integration power amplifier.At present along with the high fidelity three-dimensional audio technology popularization, many power amplifiers also has applied the high fidelity technology.The hig
14、h fidelity meaning is refers to the audio frequency electro-acoustic system and the equipment or the part maintains the sound signal original appearance ability.Regarding the general family acoustics so long as the bass is vigorous, is plentiful, the tenor is solid, is powerful, treble clear bright,
15、 can make the listener to be satisfied also thought achieved the high fidelity the request.Person at talk of time the strength of the voice be very limited, if make in a the assembly hall which have a thousands person the each persons ability clearly hear is impossible.Make use of power enlarger, pe
16、rson as long as toward a words tube to talk, through power enlarger enlarge, send out from the loudspeaker again very strong of voice, can make the person of whole assembly hall all hear.The voice that the person talk became weak through a words tube of telecommunication number, the electric voltage
17、 size of this signal together voice of strong or weak become direct proportion, it of frequency together voice of frequency homology, this kind of telecommunication number be called audio frequency signal.There is the audio frequency signal that the words tube get, the electric voltage only have sev
18、eral milli- Fu, power enlarger this weak of the audio frequency signal enlarge, from the power enlarger output carry can output the power reach several tile to several ten tiles, with go to larger audio frequency signal, push loudspeaker, send out strong of voice. In this process, the function of po
19、wer enlarger is to carry on audio frequency telecommunication number to enlarge, so the power enlarger be also an audio frequency enlarger.The words tube can become the telecommunication number to the voice;The loudspeaker can become the voice to the telecommunication number.We are called the electr
20、icity voice to this component component.Power enlarger have to together electricity voice component match usage, then can exertive of function.The power enlarge electric circuit(brief name power enlarger) usually Be located on many the class enlarge the last class of electric circuit, its mission is
21、 front the class electric circuit enlarge behind of electric voltage signal again carry on power to enlarge, with enough of output power push performance organization work, such as loudspeaker give out sound, the electric motor revolve, after electric appliances action, appearance the needle deflect
22、 etcThe power enlarge electric circuit and electric voltage to enlarge electric circuit to all belong to energy conversion electric circuit, they are to provide the direct current power the direct current power supply the conversion become is enlarged signal of exchanges power, have thus the functio
23、n that power and electric voltage enlarge.But because of in manily the class enlarge the electric circuit the position of the place dissimilarity, they respectively of function is dissimilarity of:The electric voltage which place class before be placed in enlarge the mission of electric circuit is i
24、dentify the weak signal of importation and take into valid of enlarge, mostly work under the condition of low electric voltage, small electric current, low Zao voice, research of the main index sign be an electric voltage to enlarge multiple, importation electric resistance, output electric resistance, letter Zao ratio, frequency characteristic etc., they work, oneself consume of power not big, get down one class outputs main is an electric voltage signal。
