LC谐振放大器的设计

LC谐振放大器的设计摘要：本文是基于LC高频小信号放大电路的设计，它由前级衰减电路、LC谐振放大电路、多级增益放大电路、电源电路组成。其中前级衰减电路用π型电阻网络实现40dB的衰减；核心LC谐振放大器采用三极管2SC1815构成的单调谐回路选频放大器，实现15MHz的谐振频率和300KHz的带宽调节，增益放大电路由SGM8067组成的三级同相放大电路实现15MHz带宽60dB放大倍数的放大，整个LC放大电路的带内波动不大于2dB；电路所需的3.6V稳定电压由锂电池18650提供。本设计很好实现谐振频率15MHz、带宽300KHz、增益76dB以及带内波动小于1dB的谐振放大电路，并且本设计采用高频三极管2SC1815和高速高带宽运算放大器SGM8067联合组成LC谐振放大电路，比单纯用高频三极管组成的多级LC谐振放大电路要简单，调试起来也很容易。关键词：π形网络；LC谐振；SGM8067DesignoftheLCresonantamplifierAbstract:ThispaperisbasedonLChighfrequencyamplifiercircuitdesignofsmallsignal,itbytheformerstageattenuationcircuit,LCharmonicoscillatoramplifiercircuit,multi-levelamplifiercircuit,thepowersupplycircuit.Thetoplevelwithπattenuationcircuittyperesistancenetworkrealizationof40dBattenuation;CoreLCresonancewithtransistoramplifier2SC1815consistsofthesingletunedcircuitchoosefrequencyamplifier,realizetheresonancefrequencyofthe15MHzofbandwidthand300KHzregulation,gaintheSGM8067amplifiercircuitofthesamephase3amplifiercircuitrealize15MHzbandwidth60dBmagnificationmagnification,thewholeLCamplifiercircuitwiththefluctuatedinnotgreaterthan2dB;Circuitof3.6Vvoltagestabilityneededbythelithiumbattery18650provides.Thisdesignisverygoodrealizetheresonancefrequency15,300MHzbandwidth,gain76dBKHzandwithlessthan1dBfluctuatedinresonantamplifyingcircuitandthedesignUSEShighfrequencytransistor2SC1815andhighspeedhighbandwidthoperationalamplifierSGM8067together,LCresonanceamplifiercircuit,thanpurewithhighfrequencytransistorcomposedofmultilevelLCresonanceamplifiercircuitissimple,itiseasytodebug.目录1绪论.............................................................................................................................................11.1课题意义与背景..........................................................................................................11.2高频小信号调谐放大器的原理分析......................................................................12系统的整体方案论证与分析...............................................................................................32.1系统设计的功能目标................................................................................................32.2系统设计方案分析.....................................................................................................33硬件电路设计..........................................................................................................................53.1衰减器的设计..............................................................................................................53.2LC谐振电路..................................................................................................................63.2.1LC谐振电路的原理.......................................................................................63.2.2LC谐振电路的参数计算..............................................................................83.2.3LC谐振电路设计............................................................................................83.3增益放大电路............................................................................................................123.3.1双电源同相比例运算电路.........................................................................123.3.2单电源运算放大电路..................................................................................133.3.3SGM8067基本资料........................................................................................153.4增益放大电路的设计..............................................................................................163.5电源..............................................................................................................................174电路的仿真与测试...............................................................................................................184.1电路基于multisim仿真........................................................................................184.2系统的测试方案与数据分析.................................................................................194.2.1测试仪器.........................................................................................................194.2.2测试方案.........................................................................................................204.2.3测试数据.........................................................................................................205结束语......................................................................................................................................21[参考文献]..................................................................................................................................22附录...........................................................................................................................................23致谢...........................................................................................................................................2411绪论1.1课题意义与背景在无线通信中，发射与接收的信号应当适合于空间传输。所以，被通信设备处理和传输的信号是经过调制处理过的高频信号，这种信号具有窄带特性。而且，通过长距离的通信传输，信号受到衰减和干扰，到达接收设备的信号是非常弱的高频窄带信号，在做进一步处理之前，应当经过放大和限制干扰的处理。这就需要通过高频小信号放大器来完成。这种小信号放大器是一种谐振放大器。高频小信号放大器广泛用于广播、电视、通信、测量仪器等设备中。高频小信号放大器可分为两类：一类是以谐振回路为负载