标题: PCB·????????è??????EMI·???
apple
超级版主
Rank: 8Rank: 8


UID 6
精华 4
积分 593
帖子 619
阅读权限 101
注册 2003-12-17
状态 离线
发表于 2004-2-19 16:10  资料  个人空间  短消息  加为好友 
PCB·????????è??????EMI·???



???????÷??

??????±?

PCB????

?à?????????è??

×??á

×÷????Rick Hartley
????PCB?????¤????
Applied Innovation Inc.

????EMI??????°ì·¨???à?????ú??EMI????·?·¨°ü?¨??????EMI????????????????????EMI????????????EMI·????è??????±?????×??ù±???PCB??°???·???????PCB·?????????????EMI·???????×÷?????è????????

???????÷??

??IC?????????????ü???í??°??????±????????????????IC????????????±??????ü?ì??????????????·?????????????ì????????????????ì??????????????????????·¨???????????ú????????????IC?????ù?è???????¨???????????????????????÷?????????????????????????·?????????????á?????????????????????????????÷????????EMI??????????????????÷á??????????????

?????????·°?????IC??????IC???§?????????????????????????????????÷???ü???????????????????á????????????·????????÷?ù??????????·??????????????????????????????????????????????ù????????????????????????????????EMI??

?±????????????IC??????????????±??????????????ò?????????????????????????ì??×??????±??????IC?????????ù?????????????????í????????

????????????EMI?????????????úì???????????×???????????????????????±??????????è???à?±???????????????????????????á??????????÷á????????????????????°?????ì???????·??????????????????°?¤×÷????(??IC?????±????????)???¨????????·????????à??6mil????????FR4???????ò????·????????????????§????????75pF?????????????à???????????ó??

?????±????100??300ps???÷???????à??????°??????°IC??·??????????????±????100??300ps·??§???÷??????????????±???????ì?100??300ps?????±???????·??3mil?????à???ó?à?????????????????????±????±????????????à??ì?1mil??·??????????????é?????????????????ú??FR4?é?????????????????????????????????ú×?100??300ps?????±?????·???è?????ó??

?????????????á??????????????·?·¨??????ì????ì??????1??3ns?????±?????·??3??6mil?????à??FR4?é?????????¨??×??????í???????¨????????????×???????????????????EMI??????????????±?????????PCB·????????è???????????¨?????à??3??6mil??

??????±?

??????×?????????????·?????????????°??ù????????×???·????????ò????????????????°¤?????????ò??????????ì???????????·????????????????????????????à???????????????????????à???????????????????????ù?????°·???????????

PCB????

??÷á?ù?????????????úì???±???????EMI??????·???????·?°????¨???????÷???????????÷???????????ò?à????·???????????????????·????à?????????é????áá??????

4??°?

4??°??è???????????±?????????×????????????????62mil??????°????????????????????????????????????????????????????????????à???????ó??

??????±????ó????????????????????????????????4??°??????ú·?°?????????·?°?????????EMI????????????????????ì?°???????????×??????????????§??×???????(·????ù???ó????????????)????????

?????????×??·?°???PCB???????ù?????????????????ù??????/?????????????????????????í??×??????????????????÷???·??×è?????????????????·????×è??????????EMI????????????????????????×???4??PCB?á??????????·?°???????×???????????????????×?????????·?°??à??????4??°?????????????????????????×è??????????4??°????ù?·????


??????????×???×è????????????·?°?????·???????????×?????????????????????????????±????í?????????ò???????????????????????????????????????????·±?DC????????????????

6??°?

????4??°?????????????±????ó???ò×???????6??°?????????6??°??è????????????·?°?????????????±?×÷???????????????????÷????????????????×÷??????????????????????????

????????????????·?±?·?????2????5??????ì?????????×è????????????????EMI·???·???????????????????????×è????????????????????·?·¨????·??????·????

????????????????·?±?·?????3????4?????????è????????????????×è??????????ì???1??????6??????????±?????????????EMI??????????????????????????????????×?????×????¤??????(??ì?????×??????¨?¨?¤??1/20)???ò?????è??????????????EMI??????????????????????????×??????ò??????????????????????(??1/20?¨?¤??????)???ò??????EMI????????±????????°?ù???????????????????????????à???à????

?¨????????6??°??è????°?????1????6??????????????3????4??×?????????????ì??????????????????????????????????????????????????ò??EMI?????????????ì???????è?????±????ì?×????????????????°???é??????????????×???????????×??????ò???????ò????????6??°????????????à??????????

?í????6??°????????????????????????????????????????????????????????ê?????è???ù?è?????·???????????????????à????????????????????????????????×???????????????????????

???¨???á?????¤???ì?????é·?????????????°ì·¨??????3???ù??????°×???ò??????????áá??????3???????????????üì????????ò???????????é°???????????????×÷???á???????????·°?????????±??????????ò?????????????×???????à????????1/20?¨?¤?????????????????????????í???é??????????????

10??°?

??ì??à??°?????????????????·???±????ù??10?ò12???????·°?????????????×è??·???????????·????????????????????ê?????????????ì???????ê????????°?62mil???????¤???ì12??°????§??±????à?????????¤12??°??????ì???????à??

??ì????????????·??????×?????????????????10??°??è????·???????6????×?????????·?°???·?×??????í?????????????????·???à????????????°?????????????????????????????????????????????????????????????

?????è???????????÷?°?????·???÷?á???????????¨?·?????±????????????????1????X·??ò×???????3????Y·??ò×???????4????X·??ò×??????????à?????±??????×???????1??1????3????????·???×é??????4??????7????????·???×é??????8??????10????×?áá????·???×é?????±?è????±?×???·??ò?±????1???????????????????°???×??????3????áá????±?·??ò?????????????í????×??????ù×?????×÷???è????????????????×?????

???ù???±??????×???·??ò±????±?????????????×????8??????10???ò????4??????7???????ù???????·±????????°?ò?¨?·?????·??????????×???????????????????????1????×????????·????2??????????2????×???????÷á??1?????????????????????°???×??×???????3???????????·??????2????????±????????????ó?????????????°????????????±???????

????????×??????????ù????÷á°ì??±?????1???????????????????×????10???????±???·????????????9???°???????????????·???÷??????×??ü?????????×(????×è?ò????????????????????)?????????????ü???????ù?????×???ò????×????????????????ù?ü?????×?????????????á±??ó??????????????EMI???¨?á??????

?±??????±??????????×?????????????????????????????????±???????ü?????×??·??????????×?????ù?????????·????????·??????±????????????ì???4??????7??·???×é???????????·???????????ò??????(????5???ò??6??)·??????ò???????????????????????????????????????????×??????

?à?????????è??

???????????????????????????è???????ó???÷???ò???·°?????????×é???????????????????????é??????????????????????????????·????????????????ù??????????????????·????÷??????×è???à???????????÷?????????????????????ì??×è?????à?????ò·??÷?????ù???????????????ó???à??????EMI?á?±????????

???????·°????????à???????????????????????ò?à?????è???à???????????????????????????????¨?÷×??????????????????????????????????é???????·?¨???????????????????????·°????????±?????????ì?????????á???????ó??

×??á

??ì??ó?à???¤?????è???????·°???????62mil???????¤?×?ò???×?????????????·°???±?????ì????·°?·?????????????????????ì???????????±????ó?????·°???±?????????·???·?°????????í?????????????¤?×?ò???×?????·°??????¤??????????±?????·???·?·¨??????????

???·°??è?????????????×?????????·°????????????????????????ü????????·?????????±??¤???????÷???????·?????????????????ò??????????????????×???????????????????????????±??????????ü???í???é??????????×????????????·???????????????????????????????????????????à(?ò????????)???????????????ù???????ù±??????????ò???????è????×????????è?????ó?????·°?????????IC???????±???????????????ü????±???????????????????EMI??±???????±???????????


[???ù±?apple??2004-02-19 16:11????±à??]





?????§???????????°????????
---------------------------------------
顶部
zona
超级版主
Rank: 8Rank: 8


UID 3
精华 0
积分 503
帖子 532
阅读权限 101
注册 2003-12-16
状态 离线
发表于 2004-2-23 14:09  资料  个人空间  短消息  加为好友 
??????·¨???÷??°?





???í?ì?????????????á°ò±?????
顶部
 



当前时区 GMT+8, 现在时间是 2024-5-3 14:47

    本论坛支付平台由支付宝提供
携手打造安全诚信的交易社区 Powered by Discuz! 5.5.0  © 2001-2007 Comsenz Inc.
Processed in 0.013416 second(s), 6 queries

清除 Cookies - 联系我们 - 我要委托设计网 - Archiver