3.1.2数字自动增益控制… …28 3.2数字电视调谐器(TV-tuner)系统架构及系统控制方法…29 3.2.1数字电视调谐器(TV-tuner)的系统架构 30 3.2.2各模块增益控制流程… …30 3.2.3各个模块的目标功率设计 33 3.3自动增益控制算法… 33 3.3.1系统控制状态机 …34 3.3.2增益核心算法状态机…35 3.3.3输出功率的数字编码方法… 38 3.3.3.1功率检测器(PWD)的输出编码 …… 39 3.3.3.2幅度检测器(RSS)的输出编码…40 3.4其他模块…… 41 3.4.1RC偏差校正模块 41 3.4.2功率检测器的直流失调校正 42 3.4.3脉宽调制译码… 43 3.4.4噪声与带外非线性的优化模块… 45 第四章电路仿真及测试…。 49 4.1各模块仿真结果… 49 4.1.1系统仿真… 49 4.1.2电阻电容校正模块仿真… 51 4.1.3功率检测器直流校正模块仿真… 51 4.1.4脉宽调制译码模块仿真… 51 4.2数字电视调谐器的测试结果… 52 4.2.1系统自动增益控制测试… 52 4.2.2脉宽调制译码测试 53 第五章总结与展望… 54 5.1总结… 54 5.2展望… 54 参考文献… …55 致谢… …57II 3.1.2 数字自动增益控制 ······················································· 28 3.2 数字电视调谐器(TV-tuner)系统架构及系统控制方法 ···················· 29 3.2.1 数字电视调谐器(TV-tuner)的系统架构 ······························ 30 3.2.2 各模块增益控制流程 ···················································· 30 3.2.3 各个模块的目标功率设计 ·············································· 33 3.3 自动增益控制算法 ································································ 33 3.3.1 系统控制状态机 ·························································· 34 3.3.2 增益核心算法状态机 ···················································· 35 3.3.3 输出功率的数字编码方法 ·············································· 38 3.3.3.1 功率检测器(PWD)的输出编码 ·························· 39 3.3.3.2 幅度检测器(RSSI)的输出编码 ·························· 40 3.4 其他模块············································································ 41 3.4.1 RC 偏差校正模块 ························································· 41 3.4.2 功率检测器的直流失调校正 ··········································· 42 3.4.3 脉宽调制译码 ····························································· 43 3.4.4 噪声与带外非线性的优化模块 ········································ 45 第四章 电路仿真及测试 ···································································· 49 4.1 各模块仿真结果 ··································································· 49 4.1.1 系统仿真 ··································································· 49 4.1.2 电阻电容校正模块仿真 ················································· 51 4.1.3 功率检测器直流校正模块仿真 ········································ 51 4.1.4 脉宽调制译码模块仿真 ················································· 51 4.2 数字电视调谐器的测试结果 ···················································· 52 4.2.1 系统自动增益控制测试 ················································· 52 4.2.2 脉宽调制译码测试 ······················································· 53 第五章 总结与展望 ·········································································· 54 5.1 总结·················································································· 54 5.2 展望·················································································· 54 参考文献 ······················································································· 55 致谢 ······················································································· 57