高频小信号调谐放大器课程设计

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1、摘要放大高频小信号（中心频率在几百KHZ到几百MHZ，频谱宽度在几KHZ到几十MHZ的范围内）的放大器，称为高频小信号放大器。这类放大器，按照所用器件可分为晶体管，场效应管和集成电路放大器；按照通过频谱的宽窄可分为窄带和宽带放大器；按照电路形式可分为单级和级联放大器；按照所用负载性质可分为谐振放大器和非谐振放大器。所谓谐振放大器，就是采用谐振回路作负载的放大器。根据谐振回路的特性，谐振放大器对于靠近谐振频率的信号，有较大的增益；对于远离谐振频率的信号，增益很小。所以，谐振放大器不仅有放大作用，而且也起着滤波或选频的作用。高频小信号调谐放大器广泛应用于通信系统和其它无线电

2、系统中，特别是在发射机的接收端，从天线上感应的信号是非常微弱的，这就需要用放大器将其放大。本文以理论分析为依据，以实际制作为基础，运用LC电路的谐振作为选频和滤波，利用三极管的放大作用来实现小信号放大的作用。关键字：三极管；LC电路；放大器；高频小信号 IIIAbstractZoominhighfrequencysmallsignal(centerfrequencyinhundredsofKHZtoseveralhundredMHZ,spectrumwidthintherangeofafewKHZtodozensofMHZ)amplifier,knownasthehig

3、hfrequencysmallsignalamplifier.Thiskindofamplifier,accordingtothedevicecanbedividedintothetransistor,fieldeffecttubeandinteg-ratedcircuitamplifier;Accordingtothethroughspectrumwidthcanbedividedintonarrowbandandbroadbandamplifier;Accordingtothecircuitformcanbedividedintosingle-stageandcas

4、cadeamplifier;Accordingtothenatureoftheloadcanbedividedintoresonanceamplifierandtheresonantamplifier.Theso-calledresonanceamplifier,istouseasaloadresonanceloopoftheamplifier.Accordingtothepro-pertiesoftheresonantcircuit,theresonanceamplifierforclosetotheresonantfre-quencyofthesignal,have

5、biggergain;Tostayawayfromtheresonancefrequencyofthesignal,gainissmall.So,resonanceamplifierhasamplificationeffectnotonly,andalsotoplaytheroleofafilterorfrequencyselective.Highfrequencysmallsignaltunedamplifieriswidelyusedincommunicationsystemsandotherradiosystems,especiallyinthereceiving

6、endofatransmitter,inductionfromtheantennasignalisveryweak,thisneedswiththeamplifiertoenlargeit.Inthispaper,basedontheo-reticalanalysis,basedontheactualproduction,usingtheLCresonancefrequencyselectiveandfilteringcircuit,triodeamplifyingfunctionisusedtorealizetheroleofsmallsignalamplifier.

7、Keywords:triode;LCcircuit;Amplifier;HighfrequencysmallsignalIII目录1绪论11.1高频小信号调谐放大器的由来11.2高频小信号调谐放大器的用途及其功能12高频小信号放大器电路设计的原理22.1高频小信号调谐放大器的基本原理22.2高频小信号调谐放大器主要质量指标22.2.1增益22.2.2通频带22.2.3选择性22.2.4品质因素22.2.5噪声系数22.3各元器件参数设计32.3.1静态工作点的选择32.3.2谐振回路的参数计算43电路仿真63.1电路仿真图63.2电路的输