【正文】 ve a higher demand, which on most frontend receiver in the lownoise amplifier to higher requirements: lownoise, the appropriate gain, the stability of working frequency band. This paper describes the use of ADS software design of microwave lownoise smallsignal amplifier. Selection of Agilent Technologies’ s ATF54143 amplifier transistor (EpHEMT), Work in which frequency range 2020MHz ~ 2025MHz. This article first analyzes the general lownoise amplifier of the basic structure and requirements of indicators and design principles. ReATF54143 transistors based on the preliminary design of matching works, bias circuits, and methods to resolve the instability. Finally, ADS software simulation through good circuit design optimization and a good PCB circuit diagram drawn to plete the circuit design and circuit debug and test the actual circuit. Various test results show that lownoise amplifier performance. Key words: lownoise amplifier ATF54143 ADS simulation SMITH Chart impedance matching RF (microwave) . . 第一章 緒論 ................................................................................................................... 5 低噪聲放大器 .................................................................................................... 5 概念 ........................................................................................................ 5 主要功能 ................................................................................................. 5 主要應(yīng)用領(lǐng)域 .......................................................................................... 6 低噪聲放大器的研究現(xiàn)狀 .................................................................................. 6 本文的主要研究成果和內(nèi)容安排 ........................................................................ 7 第二章 低噪聲放大器的分析與研究 ................................................................................ 9 低噪聲放大器的基本結(jié)構(gòu) .................................................................................. 9 低噪聲放大器的基本指標(biāo) .................................................................................. 9 噪聲系數(shù) ............................................................................................... 10 增益 ...................................................................................................... 10 輸入輸出駐波比 ..................................................................................... 11 反射系數(shù) ............................................................................................... 11 放大器的動(dòng)態(tài)范圍（ IIP3） .................................................................... 11 低噪聲放大器設(shè)計(jì)設(shè)計(jì)的基本原則 .................................................................. 12 低噪聲放大管的選擇原則 ....................................................................... 12 輸入輸出匹配電路的設(shè)計(jì)原則 ................................................................ 12 第三章 低噪聲放大器的設(shè)計(jì) ........................................................................................ 15 放大器設(shè)計(jì)的主要流程 .................................................................................... 15 低噪聲放大管的選擇 ....................................................................................... 15 穩(wěn)定性計(jì)算 ..................................................................................................... 17 輸入輸出匹配電路電路設(shè)計(jì) ............................................................................. 18 偏置電路 ......................................................................................................... 19 電路中需要注意的一些問題 ............................................................................. 19 第四章 ADS 軟件仿真設(shè)計(jì)及電路的最終實(shí)現(xiàn) ............................................................... 21 ADS 軟件介紹 ................................................................................................. 21 ADS 仿真設(shè)計(jì) ............................................................................................... 23 S 參數(shù)仿 真 ............................................................................................ 23 SP 模型仿真 .......................................................................................... 26 封裝模型仿真 ........................................................................................ 39 ADS 仿真設(shè)計(jì)結(jié)果分析 ................................................................................. 46 第五章 PCB 板設(shè)計(jì)和最終電路的測(cè)試 .......................................................................... 47 PCB 板電路圖 ................................................................................................ 47 . . Protel的介紹 ......................................................................................... 47 用 Protel繪制 PCB 圖 ............................................................................. 47 電路焊接和測(cè)試結(jié)果 ....................................................................................... 49 第六章 總結(jié)與展望 ...................................................................................................... 52 本文總結(jié) ......................................................................................................... 52 不足與進(jìn)一步的工作 ....................................................................................... 52 第七章 結(jié)束語 ............................................................................................................. 54 參考文獻(xiàn) ........................................................................................................................ 55 致謝 ............................................................................................................................... 56 附錄 A ........................................................................................................................... 57 . . 第一章 緒論 低噪聲放大器 在無線通信系統(tǒng)中，為了提高接 受信號(hào)的靈敏度，一般在接收機(jī)