目录 图目录… … 表目录… …V 摘要… VI Abstract…. VII 第一章概述… …1 1.1研究背景 …1 1.2研究动机… 2 1.3论文结构… 3 第二章射频设计中的主要参量与接收机架构… X 2.1非线性 × 2.1.1三阶交调点 6 2.1.2P3的级联公式… …7 2.1.3宽带信号的三阶交调… 8 2.1.4复合三阶失真 9 2.2噪声… …12 2.2.1信噪比… 12 2.2.2噪声系数… 13 23信号噪声失真比… 14 2.3.1概述… 14 2.3.2信号噪声失真比的级联公式…15 2.3.3影响信号噪声失真比的几个因素…16 2.3.3.1噪声系数对信号噪声失真比的影响…17 2.3.3.2非线性对信号噪声失真比的影响…17 2.3.3.3增益对信号噪声失真比的影响………18 2.4接收机的主要架构…22 2.4.1外差架构… 22 2.4.2零中频架构 24 2.4.3其他架构… 25 第三章系统自动增益控制…26 3.1概述…… 26 3.1.1反馈环路与前馈环路…26I 目录 图目录 ··························································································· III 表目录 ··························································································· V 摘要 ····························································································· VI Abstract ······················································································ VII 第一章 概述 ···················································································· 1 1.1 研究背景············································································· 1 1.2 研究动机············································································· 2 1.3 论文结构············································································· 3 第二章 射频设计中的主要参量与接收机架构 ·········································· 4 2.1 非线性················································································ 4 2.1.1 三阶交调点 ································································· 5 2.1.2 IP3的级联公式 ····························································· 7 2.1.3 宽带信号的三阶交调 ····················································· 8 2.1.4 复合三阶失真 ······························································ 9 2.2 噪声·················································································· 12 2.2.1 信噪比 ······································································ 12 2.2.2 噪声系数 ··································································· 13 2.3 信号噪声失真比 ··································································· 14 2.3.1 概述 ········································································· 14 2.3.2 信号噪声失真比的级联公式 ··········································· 15 2.3.3 影响信号噪声失真比的几个因素 ····································· 16 2.3.3.1 噪声系数对信号噪声失真比的影响 ···················· 17 2.3.3.2 非线性对信号噪声失真比的影响 ······················· 17 2.3.3.3 增益对信号噪声失真比的影响 ·························· 18 2.4 接收机的主要架构 ································································ 22 2.4.1 外差架构 ··································································· 22 2.4.2 零中频架构 ································································ 24 2.4.3 其他架构 ··································································· 25 第三章 系统自动增益控制 ································································· 26 3.1 概述·················································································· 26 3.1.1 反馈环路与前馈环路 ···················································· 26