多級(jí)放大器的頻率響應(yīng)研究畢業(yè)論文(已修改)
2025-07-05 08:18 本頁面
【正文】 多級(jí)放大器的頻率響應(yīng)研究摘要 放大器作為電子線路的重要組成部分，承擔(dān)著對(duì)信號(hào)的放大功能。頻率響應(yīng)是放大器的主要性能指標(biāo)，其表明了放大器對(duì)于不同頻率信號(hào)的放大功能。本文首先推導(dǎo)出多級(jí)放大器放大倍數(shù)與各級(jí)放大器放大倍數(shù)之間的關(guān)系式，然后以基本放大電路為出發(fā)點(diǎn)，分析其對(duì)于高頻、中頻和低頻三個(gè)不同頻段信號(hào)的放大能力，并討論其截止頻率，得出影響放大器頻率特性的主要因素。接著推導(dǎo)出多級(jí)放大器的頻率響應(yīng)表達(dá)式，并推導(dǎo)出多級(jí)放大器截止頻率與各級(jí)放大器截止頻率的關(guān)系式。可以得出多級(jí)放大器的通頻帶由各級(jí)放大器通頻帶所決定，且其通頻帶小于組成它的各級(jí)放大器的通頻帶的結(jié)論。最后采用 Multisism 軟件進(jìn)行仿真，對(duì)理論結(jié)果進(jìn)行驗(yàn)證，從而得出結(jié)論。關(guān)鍵詞 放大器；多級(jí)放大器；頻率響應(yīng)；截止頻率；MultisimThe research of multistage amplifier39。s frequency responseAbstract As the important part of electronic circuits ,amplifier assumes the signal amplification. The frequency response is the amplifier39。s main performance index, which indicates the amplifier for amplification of different frequency signals. First,this paper deduced the relation between the multistage amplifier amplification and the amplifier amplification at all levels .Second, with the basic amplifying circuit as the starting point,it discussed the amplification capability of high frequency, medium frequency and low frequency in three different frequency band signal, and then discussed the cutoff frequency of amplifier and thus we can obtain the main factors which impacts the amplifier frequency characteristics. Thirdly, the expression of the frequency response of multistage amplifier, the expression of the relation between the multistage amplifier cutoff frequency and the amplifier amplification cutoff frequency at all levels are deduced in this article .So we can draw the conclusion that the multistage amplifier passband is determined by amplifier passband at all levels and the passband is less than the passband of the amplifier at all levels. At last the theoretical results is simulated by using Multisism software and then lead to the conclusion.Keywords Amplifier。 Multistage amplifier。 Frequency response。 Cutoff frequency。Multisim目 次1 引言 ...............................................12 密勒定理及晶體管的混合 Π 等效模型 ..................2 密勒定理 ................................................................................2 晶體管的混合 Π 等效模型 ...................................................23 多級(jí)放大器的頻率響應(yīng) ................................3 頻率響應(yīng)的定義 ....................................................................3 多級(jí)放大器的基本形式 ........................................................5 多級(jí)放大器頻率響應(yīng)的分級(jí)分析法 ....................................5 N 級(jí)放大電器的頻率響應(yīng)分析 ...........................................114 實(shí)驗(yàn)仿真及驗(yàn)證 .....................................14 放大電路的仿真 ..................................................................14 仿真數(shù)據(jù)與理論數(shù)據(jù)比較 ..................................................16結(jié) 論 ..............................................19參考文獻(xiàn) ............................................20致謝 ................................................211 引言在現(xiàn)代電子技術(shù)當(dāng)中，放大器占有著重要的地位，其承擔(dān)著對(duì)信號(hào)源的放大，使得一個(gè)微小的信號(hào)能夠放大，從而便于人們處理，例如對(duì)聲音信號(hào)的放大，對(duì)圖像的放大，等等。如果沒有放大器，那么我們就無法聽到收音機(jī)放出的音樂，看不到電視，更無法使用現(xiàn)在的手機(jī)，電腦等電子產(chǎn)品。多級(jí)放大器是對(duì)放大器的延伸應(yīng)用，其用處更加廣泛，地位也更加重要。而多級(jí)放大器的一個(gè)重要性能指標(biāo)就是其
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