图3-17恒定-gm自偏置电路结构… …46 图3-18局部环路增益与P3之间的关系 49 图3-19反馈晶体管的非线性如何影响输出三阶交调量… 50 图3-20衰减器模块的电路结构…51 图3-21可变增益情况下的匹配优化结构… .… 53 图3-22可变增益情况下输入匹配优化前后对比… 53 图4-1单平衡有源混频器… 56 图4-2通过减小被混频的直流信号来减小1/f噪声的方法…56 图4-3单平衡电流驱动型无源混频器… … 57 图4-4电流驱动型无源混频器的分析模型… 57 图4-5计算增益时的混频器等效电路…59 图4-6电流驱动型无源混频器输入阻抗分析模型… 60 图4-7跨导单元白噪声分析模型… 62 图4-8混频器跨阻放大器白噪声分析模型 … 63 图4-9跨导单元的1/f噪声分析模型……65 图4-10失调电压影响本地振荡波示意图… 65 图4-11存在失调电压时差分输出噪声电流情况… 66 图4-12电流驱动型无源混频器的结构。 68 图4-13跨导单元与混频器开关电路原理图… 69 图4-14开关电容密勒补偿与传统负载电容补偿波特图对比 70 图4-15混频器开关的导通交叠与闭合交叠…71 图4-16混频器开关栅极直流偏置产生电路…72 图4-17 Class AB输出级结构原理图… 73 图4-18带Class AB输出级的全差分运算放大器…75 图5-1级联系统最大增益仿真结果 77 图5-2级联系统噪声系数仿真结果…77 图5-3高增益LNA模式下射频前端IP3仿真结果 78 图5-4低增益LNA模式下射频前端lP3仿真结果… …78 图5-5射频前端电路在零中频数字电视接收系统中的实现框图 79 图5-6射频前端电路芯片照片…79 图5-7使用9030A信号分析仪测量整个接收机的噪声系数示意图…80 图5-8噪声系数测试结果… 80 图5-9双音测试频谱输出图…81 图5-10高增益LNA模式下的lP3测试曲线……81 图5-11低增益LNA模式下的P3测试曲线…82IV 图 3-17 恒定-gm 自偏置电路结构 ·····················································46 图 3-18 局部环路增益与 IIP3 之间的关系··········································49 图 3-19 反馈晶体管的非线性如何影响输出三阶交调量·························50 图 3-20 衰减器模块的电路结构·······················································51 图 3-21 可变增益情况下的匹配优化结构···········································53 图 3-22 可变增益情况下输入匹配优化前后对比··································53 图 4-1 单平衡有源混频器·······························································56 图 4-2 通过减小被混频的直流信号来减小 1/f 噪声的方法 ·····················56 图 4-3 单平衡电流驱动型无源混频器 ···············································57 图 4-4 电流驱动型无源混频器的分析模型 ·········································57 图 4-5 计算增益时的混频器等效电路 ···············································59 图 4-6 电流驱动型无源混频器输入阻抗分析模型 ································60 图 4-7 跨导单元白噪声分析模型······················································62 图 4-8 混频器跨阻放大器白噪声分析模型 ·········································63 图 4-9 跨导单元的 1/f 噪声分析模型·················································65 图 4-10 失调电压影响本地振荡波示意图···········································65 图 4-11 存在失调电压时差分输出噪声电流情况··································66 图 4-12 电流驱动型无源混频器的结构··············································68 图 4-13 跨导单元与混频器开关电路原理图········································69 图 4-14 开关电容密勒补偿与传统负载电容补偿波特图对比···················70 图 4-15 混频器开关的导通交叠与闭合交叠········································71 图 4-16 混频器开关栅极直流偏置产生电路········································72 图 4-17 Class AB 输出级结构原理图················································73 图 4-18 带 Class AB 输出级的全差分运算放大器································75 图 5-1 级联系统最大增益仿真结果 ··················································77 图 5-2 级联系统噪声系数仿真结果 ··················································77 图 5-3 高增益 LNA 模式下射频前端 IIP3 仿真结果 ······························78 图 5-4 低增益 LNA 模式下射频前端 IIP3 仿真结果 ······························78 图 5-5 射频前端电路在零中频数字电视接收系统中的实现框图 ··············79 图 5-6 射频前端电路芯片照片·························································79 图 5-7 使用 9030A 信号分析仪测量整个接收机的噪声系数示意图··········80 图 5-8 噪声系数测试结果·······························································80 图 5-9 双音测试频谱输出图····························································81 图 5-10 高增益 LNA 模式下的 IIP3 测试曲线······································81 图 5-11 低增益 LNA 模式下的 IIP3 测试曲线······································82