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#1

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发表于 2004-3-29 18:12 资料个人空间短消息加为好友

pcb???????????í???¨???§???ù??????

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

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

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   ????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)




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




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   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)




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   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)




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   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????
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   ×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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#2

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发表于 2004-3-30 00:59 资料个人空间短消息加为好友

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UID 60
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#3

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发表于 2004-8-17 14:05 资料个人空间短消息加为好友

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?????ù???????????ù??????

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[img]http://img1.soufun.com/bbs/2004_08/24/1093318198145.gif[/img]