高速数字电路设计和EMC

johnxhf

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1. 高速数字电路设计..........................................................................................................5
1.1 何谓高速数字信号？ ....................................................................................................5
1.2 微带线、带状线的概念.................................................................................................5
1.2.1 微带线（Microstrip）...............................................................................................5
1.2.2 带状线（Stripline） .................................................................................................6
1.2.3 经验数据.................................................................................................................6
1.2.4 同轴线（coaxial cable）...........................................................................................6
1.2.5 双绞线（twisted-pair cable） ....................................................................................7
1.2.6 等间隔的电容负载的影响........................................................................................7
1.3 常见高速电路..............................................................................................................8
1.3.1 ECL（Emitter Coupled Logic）电路..........................................................................8
1.3.2 CML（Current Mode Logic）电路.............................................................................9
1.3.3 GTL（Gunning Transceiver Logic）电路..................................................................10
1.3.4 BTL（Backplane Transceiver Logic）电路...............................................................10
1.3.5 TTL（Transistor Transistor Logic）电路................................................................... 11
1.3.6 模数转换电路—线接收器......................................................................................12
1.4 常见电路匹配措施.....................................................................................................12
1.4.1 反射......................................................................................................................12
1.4.2 终端匹配...............................................................................................................13
1.4.3 始端匹配...............................................................................................................15
1.5 高速电路设计一般原则和调试方法.............................................................................16
1.5.1 同步逻辑设计........................................................................................................16
1.5.2 了解选用器件的输入、输出结构，选用恰当的匹配电路；在考虑节省功耗，电路又能容许的情况下，可适
当地引入失配。............................................................................................................19
1.5.3 对极高速率（300MHz 以上）的信号，一般建议选用互补逻辑，以降低对电源的要求。19
1.5.4 了解每一根高速信号电流的流向（电流环） ..........................................................19
1.5.5 信号的布线、电源和地层的分割，是否符合微带线、带状线的要求？高速信号要有回路地相配（不是屏蔽