便携音频功放设计

本科毕业设计题目便携音频功放设计学院专业班级学号学生姓名指导教师完成日期诚信承诺我谨在此承诺：本人所写的毕业论文《XXXXXXXX》均系本人独立完成，没有抄袭行为，凡涉及其他作者的观点和材料，均作了注释，若有不实，后果由本人承担。承诺人（签名）：年月日杭州电子科技大学本科毕业设计I摘要本设计介绍了一种前后级AB类音频功率放大器。该放大器主要应用在便携式移动设备，MP3／MP4、手机、移动DVD、电子书等也就是俗称的耳放。其优点是，音量控制的形式集成数字功放，POP-CLICK模块的噪声抑制。数字音量控制模块16可提供+12分贝〜-33d的增益控制范围。形式噪声抑制POP-CLICK有效地抑制系统产生的切换杂音。放大器还包括一个高活性模式关闭，大大减少小集成电路，这使得它更适合于便携式设备领域的功耗。该放大器采用0.5urn过程COMS标准。在16欧姆的负载，THD+N小于小于0.1％（1千赫）输出条件是否大于或等于105MW平均功率（5V电源电压）。小于0.3uA放大器在关闭模式下的能量消耗。在音频范围为20Hz〜20kHz的，32欧姆的负载输出70mW平均功率。小于0.3％的THD+N波普切换音频系统时，所述振幅小于30mY。关键字：AB类音频功放、POP—CLIcK、耳放杭州电子科技大学本科毕业设计IIABSTRACTThisdesignintroducesaclassABaudiopoweramplifierbeforeandafterclass.Theamplifiersareusedinportabledevices,MP3/MP4,mobilephones,mobileDVD,alsoknownase-booksandotheramp.Theadvantageisthatthevolumecontrolintheformofanintegrateddigitalamplifier,noisesuppressionmodulePOP-CLICK.Digitalvolumecontrolmodule16mayprovidegaincontrolrangeof+12dB~-33d.IntheformofnoisesuppressionPOP-CLICKeffectivelysuppressswitchingnoisegeneratedbythesystem.Amplifieralsoincludesahighlyactivemodeoff,greatlyreducingthesmallintegratedcircuit,whichmakesitmoresuitableforportabledevicesinthefieldofpower.Theamplifieruses0.5urnCOMSstandardprocedure.Inthe16ohmload,THD+Noflessthanlessthan0.1%(1kHz)isgreaterthanorequaltotheoutputcondition105MWaveragepower(5Vsupplyvoltage).Lessthan0.3uAinshutdownmodeamplifierenergyconsumption.Intheaudiorangeoutput70mWaveragepower20Hz~20kHzand32ohmload.Lessthan0.3%THD+NPopswitchtheaudiosystem,theamplitudeislessthan30mY.Keywords：ClassABaudiopoweramplifier，POP—CLICK，T-AMP杭州电子科技大学本科毕业设计目录摘要................................................................................................................................IABSTRACT.....................................................................................................................II1引言.........................................................................................................................11.1耳放的特点及技术指标.....................................................................................11.2音频功率放大器基础以及典型结构.................................................................21.3总谐波失真(THD)..............................................................................................21.2Pop—C1ick..........................................................................................................31.4功率放大器的主要分类和性能.........................................................................51．4．1电源转换效率....................................................................................51．4．2功率放大器的分类............................................................................53．2．3AB类功率放大器............................................................................101．4本章小结........................................................................................................122低电压音频功率放大器的实现...............................................................................132．1芯片结构及关键性能指标............................................................................132．2电路实现及模块级分析................................................................................182．2．1系统实现..........................................................................................182．2．2模块分析..........................................................................................202．3系统仿真结果................................................................................................352．3．2闭环状态下的电源抑制比..............................................................362．3．3THD及输出功率.............................................................................372．4Layout以及ESD保护...................................................................................382．4．I版图布局及匹配..............................................................................382．4．2ESD保护..........................................................................................413系统测试.....................................................................................................................423．1测试系统及说明............................................................................................423．2测试结果........................................................................................................424电路的设计与制作...................................................................................................474.1电路的设计.......................................................................................................474.1.1双电源音频功率放大器原理图............................................................484.1.2双电源音频功率放大器PCB图..........................................................494.1.2电路制作与调试.........................................................................................50杭州电子科技大学本科毕业设计4.2.1利用PCB制作电路板..........................................................................504.2.2装配与调试：........................................................................................504.2.3电路图的绘制与制板中应注意的问题................................................514.2.4PCB