标题: pcb???????????í???¨???§???ù?????? [打印本页]

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作者: agang    时间: 2004-3-29 18:12     标题: pcb???????????í???¨???§???ù??????

PCB°???????????????????????????PCB×???????±í????????????????.????×????·?????????·???????????????????±?????????????????÷???????????????ù????×??????????±????????×÷??????±???????·??????????????í???????í(×??????????¤???ó?????????????§?¤????1/6(1/4)??????????????×???????·?????????????????????????????????1±í????



???ù??????????

   ???????í??????????????????????G ?? R?? ?±???????????????????????í??×??????ù??????????????????????????????????
   ??????????????????????????±¨·?????±í??,??±¨·?????????
   dU/dz = ( R + jwL) I     
   dI/dz   = ( G +jwC) U    
   ??±¨·???????????


   ?¨??????                                         


   ????R, G ?????? jwL??jwC?? ?ù???¨???ù????×è????????


   
   ???¨?????????????????????????????????????????÷?????????¨??·????¨?????????????ò????????????????????????×è?????????±????????????????????????????????????×è???????????????????§???????????ù???????????÷×è???????¨??????·??????????????è??????????
   ???÷×è???????í???????????????¨?????????????¨?????÷??±??????ò·????¨????????·????¨???÷??±?????
   ?????¨???é?????????????????????é?????é???????ò???§?é????????????
   ?ù?????é??FR4??????×???????????????180ps/inch   ??±í????????????????????140~180ps/inch??
   PCB?????????????÷??????????????
   1.1.1 ???????¨Microstrip)



    ????:
   w?????????í?? t ???????????? h?????é??????
   ????·??§??
   w/h ??±?????0.1~1.0??????
   ?à???é????????1~15??????
   ?????í???ó?????????í??7±???????
   1.1.2 ?????????????¨Embedded Microstrip)


   


   
   ??????
   w?????????í?? t???????????? h?????é??????
   ????·??§??
   w/h ??±?????0.1~1.0??????
   ?à???é????????1~15??????
   ?????í???ó?????????í??7±???????
   1.1.3 ??·???(Differential Pair)


   


   
   ??????
   w?????????í?? t???????????? h?????é?????? s????????±??????à
   ????·??§??
   w/h ??±?????0.1~1.0??????
   ?à???é????????1~15??????
   ?????í???ó?????????í??7±???????
   s????100mil??
   1.1.4 ±ê×???×???(Stripline)


   


   
   ??????
   w?????????í??   t???????????? h?????é??????
   ????·??§??
   w/h <0.35??
   ?à???é????????1~15??????
   ?????í???ó?????????í??±???????
   1.1.5 ??×???·???(Edeg-coupled Symmetrical Stripline)


   


   
   ??????
   w?????????í??   t???????????? h?????é?????? s????????±??????à
   ????·??§??
   w/h <0.35??
   ?à???é????????1~15??????
   ?????í???ó?????????í??7±???????
   s????100mil??
   1.1.6 ????????·???(Asymmetric Stripline)


   


   
   ??????
   w?????????í??   t???????????? h??h1??????????±???????????????
   ????·??§??
   ?à???é????????1~15????
   ?????í???ó?????????í??7±?????
   ?è??×??????????????????????????????????ü??????????????×è?????????±???÷×è????50?·?·×ó???±?????????¨×??ó??????5?????????±×è????????50?·?·?????±???ó????±????ó???ò?????é????????×÷???????????????????????????è?????·????×è?????????è?ú?à????EDA?í??????????CITS27??×è???????¤??????·?±??????????????ó??×è????
   ×è??????
   ×è?????í?????????????è???????ù±???????
   ×è????????????????????????·?????????????????????EMI??????·??ú????×è?????????°?á????????×è????????
   ×????à?????é???????????í???????à???é????????????×è?????±?×???è??×????????????°?ì????×???×è???????×????????PCB?§????°????é???????ó?ù??PCB???????á???·?¨???í???é?????????????????è?????°??PCB???¤?§?????????¨???????á?????ó?????§???ù???????????¤????????×è??????·?°???

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作者: ????    时间: 2004-3-30 00:59

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作者: ????    时间: 2004-8-17 14:05

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