基于multisim调制解调仿真电路设计

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1、基于Multisim调制解调仿真电路设计春芽电子科技春芽ing摘要通信电路系统中实现调制解调方法很多，而锁相环鉴频是利用现代锁相环技术来鉴频实现调制解调因为工作稳定、失真度小、信噪比高等优点被广泛应用。本课题分别设计2ASK、2PSK、2FSK的调制解调电路，功能是数字基带信号经过调制输出模拟信号，然后运用锁相环进行解调出数字信号，所以调制解调电路都运用Multisim软件进行仿真分析。对2ASK、2FSK、2PSK解调电路时低通滤波器输出的波形失真比较大，经过抽样判决电路整形后可以再生数字基带脉冲。整个硬件电路设计中，尽量做到

2、电路简单实用，基本达到功能要求。关键词：调制解调，Multisim仿真，锁相环AbstractCommunicationcircuitsystemtoachievealotofmodulationanddemodulation,andthephase-lockedloopfrequencydemodulationistheuseofmoderntechnologytoachievephaselockedloopdemodulationbecausetheworkisstable,lowdistortion,highsignaln

3、oiseratioiswidelyused.Thistopicdesignof2ASK,2PSK,2FSKmodulationanddemodulationcircuitfunctionisdigitalbasebandsignalafterthemodulationoutputanalogsignal,thenusethePLLtodemodulatethedigitalsignal,somodulationanddemodulationcircuituseMultisimsoftwaresimulationanalysis.

4、Thewaveformdistortionofthelowpassfilteroutputof2ASK,2FSKand2PSKdemodulationcircuitsisrelativelylarge,andthedigitalbasebandpulsecanberegeneratedbythesamplingdecisioncircuit.Throughoutthehardwarecircuitdesign,asfaraspossibletoachieveasimpleandpracticalcircuit,thebasicr

5、equirementstoachievefunctional.Keywords:ModulationandDemodulation,MultisimSimulation,PhaseLockedLoop目录摘要................................................................................................................................................1Abstract..........

6、...................................................................................................................................11绪论....................................................................................................................................

7、...........31.1课题研究背景.....................................................................................................................31.2国内外发展现状................................................................................................................31.3课题

8、主要研究内容............................................................................................................32锁相环基本原理........