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TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc325402378"1绪论PAGEREF_Toc325402378\h1HYPERLINK\l"_Toc325402379"1.1课题意义与背景PAGEREF_Toc325402379\h1HYPERLINK\l"_Toc325402380"高频小信号调谐放大器的原理分析PAGEREF_Toc325402380\h1HYPERLINK\l"_Toc325402381"2系统的整体方案论证与分析PAGEREF_Toc325402381\h2HYPERLINK\l"_Toc325402382"2.1系统设计的功能目标PAGEREF_Toc325402382\h2HYPERLINK\l"_Toc325402383"2.2系统设计方案分析PAGEREF_Toc325402383\h3HYPERLINK\l"_Toc325402384"3硬件电路设计PAGEREF_Toc325402384\h3HYPERLINK\l"_Toc3254