图目录 图1-1直接下变频结构调谐器结构… …5 图1-2()多个窄带组成宽带：(b)单个宽带…7 图2-1M○S管的沟道噪声… 11 图2-2电视调谐器的简化级联结构…13 图2-3共源结构…14 图2-4共栅结构…15 图2-5电阻反馈结构…16 图2-6跨导增强共栅低噪声放大器 16 图2-7电容交叉耦合差分低噪声放大器…17 图2-8电阻负反馈匹配电路的(a)噪声和(b)有用信号… …18 图2-9噪声抵消低噪声放大器示意图…18 图2-10宽带噪声抵消低噪声放大器… …19 图2-11噪声抵消技术的另一种实现…21 图3-1有源负反馈低噪声放大器…23 图3-2计算输入阻抗的小信号等效电路图…23 图3-3不同增益对应的R和gm2的值 24 图3-4计算噪声电流n1到输出电压nout的传输函数的等效小信号电路图25 图3-5输入阻抗对噪声系数的影响……28 图3-6低噪声放大器中非线性失真的产生…29 图3-7对不同电压增益Av,lP3随R=的变化关系…31 图4-1可变增益低噪声放大器的两种实现方式… 33 图4-2衰减后再放大的可变增益低噪声放大器结构…33 图4-3可变增益的低噪声放大器… 35 图4-4共栅管栅极偏置电压开关的实现… … 35 图4-5应用恒定跨导偏置技术产生偏置电流 36 图4-6低噪声放大器的偏置电路… 36 图4-7可变增益电阻衰减器…39 图4-8电阻衰减器中的开关 40 图4-9电阻衰减器的噪声因子 41 图4-10传统R-2R电阻衰减器… .…42 图4-11电阻衰减器的噪声系数与电压增益的关系…42 图4-12att与namg串联实现放大器的中间增益 42 图4-13完整的可变增益低噪声放大器…45 图5-1 Ina uhf的版图…48图目录 图 1-1 直接下变频结构调谐器结构 ····················································5 图 1-2 (a)多个窄带组成宽带；(b)单个宽带 ··········································7 图 2-1 MOS 管的沟道噪声····························································· 11 图 2-2 电视调谐器的简化级联结构 ·················································· 13 图 2-3 共源结构 ·········································································· 14 图 2-4 共栅结构 ·········································································· 15 图 2-5 电阻反馈结构 ···································································· 16 图 2-6 跨导增强共栅低噪声放大器 ·················································· 16 图 2-7 电容交叉耦合差分低噪声放大器 ············································ 17 图 2-8 电阻负反馈匹配电路的(a)噪声和(b)有用信号 ···························· 18 图 2-9 噪声抵消低噪声放大器示意图 ··············································· 18 图 2-10 宽带噪声抵消低噪声放大器················································· 19 图 2-11 噪声抵消技术的另一种实现················································· 21 图 3-1 有源负反馈低噪声放大器 ····················································· 23 图 3-2 计算输入阻抗的小信号等效电路图 ········································· 23 图 3-3 不同增益对应的 RF和 gm2的值·············································· 24 图 3-4 计算噪声电流 in1到输出电压 vn,out的传输函数的等效小信号电路图 25 图 3-5 输入阻抗对噪声系数的影响 ·················································· 28 图 3-6 低噪声放大器中非线性失真的产生 ········································· 29 图 3-7 对不同电压增益 AV，IIP3随 RF的变化关系 ······························ 31 图 4-1 可变增益低噪声放大器的两种实现方式 ··································· 33 图 4-2 衰减后再放大的可变增益低噪声放大器结构 ····························· 33 图 4-3 可变增益的低噪声放大器 ····················································· 35 图 4-4 共栅管栅极偏置电压开关的实现 ············································ 35 图 4-5 应用恒定跨导偏置技术产生偏置电流 ······································ 36 图 4-6 低噪声放大器的偏置电路 ····················································· 36 图 4-7 可变增益电阻衰减器 ··························································· 39 图 4-8 电阻衰减器中的开关 ··························································· 40 图 4-9 电阻衰减器的噪声因子 ························································ 41 图 4-10 传统 R-2R 电阻衰减器 ······················································· 42 图 4-11 电阻衰减器的噪声系数与电压增益的关系······························· 42 图 4-12 att 与 lna_mg 串联实现放大器的中间增益 ······························ 42 图 4-13 完整的可变增益低噪声放大器·············································· 45 图 5-1 lna_uhf 的版图··································································· 48