标题: zt: ?????????ê???????????????????¨?? [打印本页]

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作者: wards    时间: 2004-3-25 00:28     标题: zt: ?????????ê???????????????????¨??

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sdfuyj  

???????????????¨EMI??????????????(EMC)?
   (Electromagnetic Interference)??????????????·??????????????????????????¨???????é??°????????????????????????¨?????????í????????????·??????????????????¨??????°????????????¨?????????í??????????????????PCB?°?????è?????????????????????????·?????????÷?à???????????????????????ì????????·?????????????·????????¨???°?ì?????????ò±???????????×????????????¤×÷??
   ×?????×???????????????70?ê?ú???????????????÷?????????ú??°??¨?????±?á??1990?ê???·????1992?á???????????????ú?·???????????????????????ó?÷???????·±??ü?????ú?··???????????????????·???×??ò??·??????????????ú?·??????????????????EMC?¨Electromagnetic Compatibility????
???????????ê????(signal integrity)?
   ?????ê?????????????????????????????????????????????????ê?????????±???è?????±?ò???????ù±??è?????????????????????????????ê???????????????????ò??????????????°????è?????à???ò???????????????÷?????????ê????????°ü?¨·????????????????????????? ?????????ê?????????°????·?·¨

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??????·???(reflection)?
   ·??????????????????????¨??????????(?????????÷)??????·???????????????????????????????????·?±?·????????????????????????????à????×è????·????????á·??ú????
   ????????????×è?????????á????????·???????????????·?????·???????????????????×è????????×è????·?????????????·?????????????×è???ó????×è????·?????????????????????????×????????·???????????????????÷???????°???????????????????ò????±????ù?á???????à·?????
??????????(crosstalk)?
   ???????????????????????????????????????????????????????????????ù????????????·????????÷??????????????·???????????PCB°????????????????????à???????????????????????????°??????·????????????????¨???°?ì??
??????????(overshoot)??????(undershoot)?
   ??????????????·????ò?????????è?¨??????????????????????×???????????????????????×????????????????????????????ò·???????·???????????????±??¤???????¤×÷?????????????§?§????·????????????????????±???ò?????í?ó(?ó??×÷)??
??????????(ringing)?? ?·???????¨rounding???
   ?????????ó??·????????????????????????????????·???????????????????????????????????????????·×è?á×??????·????????????×è?á×??????????ê?????????¨??·??ú?????????????????±?????????????·????????·??????ù???????à???ò???????????????????¨?????±???????è???????????????????ê????????
??????????????·??????ù?????÷???ù?
   ?????·?????ó?????÷?????±?á??????????·??????ù?¨?ò???????????????ó???????????????±?????±?????????????ó?????????÷????????°????????????÷????????·?×°????????????????????×è?á??·????????ù?????ù?á???????????????¨0V?????ú?ú???????¨????±????????????ù?á?°?ì???ü???÷??????×÷???????????????ó????????×è???????????????????ó?????±?????÷?????????????ù?á?????????????ó??
   ?????????????¨°ü?¨??????????·?????????????±?·???????×???????????????±????????±??×?????×??????????????ò?±?????á?ú?ú?????????÷???ù?????ù?????????????á±?·?????2.5V??3.3V??5V?????ù?????à????PCB?è????????????????·??????ù?????÷???ù?è????±???????
???±?ò(time domain)?????ò(frequency domain)???????????????
   ?±?ò(time domain)?????±?????ù×????????ò???÷??±????????????????????¨?÷???ì?????ü?¨?????????????????????????±(delays)??????(skew)??????(overshoot)????????(undershoot)???°?¨???±??(settling times)??
   ???ò(frequency domain)???????????ù×????????ò???÷??±????????????????????×·????????ì?????ü?¨???????¨????FCC?????üEMI??????????????±?????
??????×è??(impedance)?
   ×è?????????????????????????????÷??±?????(Z0=V/I)???±???????????????????????????ü??×è°??ü???????±??2*TD?±???????????????ü????±?????????TD?????????±(delay)??
???????¨???±??(settling time)?
   ?¨???±???????????????????????????¨?????¨??×??????ù?è?????±????
????????????????(pin-to-pin)?????±(delay)?
   ?????????????±???????????÷??×???????±????????÷??×???????±????????±??????????±??¨??·??ú?????¨??????50%??×??????±·??ú???±?????????????????¨??????(threshold)??×??ó???±·??ú???±????×??ó????????????????(threshold) ???????ù???????é????
??????????(skew)?
   ?????????????????????????????????????????÷?????????±??????????????±????????????????±???????????????±????????
???????±??(slew rate)?
   Slew rate????±????±??(?????????????????????±????±???±???)??I/O ????????·? (??PCI)×??????????????????????????±??(slew rate)???ü??????????????
????????????(quiescent line)?
   ???±?°???±?????????ü?????????????í????±????? "stuck-at" ???òstatic????????(Crosstalk)?????????????????????±??????????????????
?????????±??(false clocking)?
   ???±???????±??????????(threshold)??????????±???×???(???±??VIL ?òVIH????)???¨????????·???????(undershoot)?ò????(crosstalk)??????
??????IBIS?????
   IBIS?¨Input/Output Buffer Information Specification?????????????ù??V/I?ú??????I/O BUFFER?ì??×? ?·?¨????·?·¨????·????????????????????????????????ú??±ê×????ü?á??????±ê×?????????????????????????????×è????????/?????±???°????????????????·???????×??????????????????§??????????·?????
   IBIS??·?×?????????±?????IBIS??·????????¤??×é??±à????????×é??????????EDA?§?????????ú???ì????°??????§?????ó?§×é??????IBIS??°?±?·????é??????1993?ê4????????????Version1.0°??????ê6?????????ó·?????Version1.1°???1994?ê6????San Diego?¨????Version2.0°??????ê12????????Version2.1°???1995?ê12 ????Version2.1°?????ANSI/EIA-656±ê×???1997?ê6??·?????Version3.0°??????ê9??±???????IEC 62012-1 ±ê×???1998?ê??????Version3.1°???1999?ê1?????????±?°×?????°?±?Version3.2°???
   IBIS±??í???????????????????ü???÷????±ê×???IBIS?????????????????????????????÷???????÷?????????????????????÷????±??????????????????????????????è????????IBIS??????·????¤????????????????IBIS??????????·??????è?????ê???????????¤×÷??
?¨1???????????????????÷???????÷??????????????
?¨2????????????????????×?????IBIS??????·?·¨??
?¨3???á??????·???????±??????ú??±?????????????????
?¨4???á??????????????IBIS????????????????????????·??????????í???¤????
   IBIS???????ò???±?????????????????????????à????Spice?¨??????Spice???ò??IBIS?????????????±??±?Spice?¤?????????????··????¤?????ü?á???????÷???????÷???????è???????????????·???????ì???????ú?¨???????????°?????ú??????????IBIS?????????÷?ü??×??????????è???¤×÷???????á???????ù???????????à???ú?·?????????????ò??IBIS???????ò???????????±×??ò??????????·????±??±??à??????Spice????????????·?????????10??15±???????????
   IBIS?á???????ê????V??I?ú??·?±??ú±í?????÷????????????????×????????°???·?¨??×?????????×???×??????ú????V??I?ú????×÷????????IBIS?á??±??¤????????TTL?????ù?????????????ú????????·??????§?????¨????????
   ??????????IBIS?????????????????¨????
v??I/O·?????·????????á??×??·???????????±??????·?×°?????ú??????ESD?á????
v?á??±??á??????·?·¨?ü?ì??·?????????
v??????????°????ò?à°??????ê????·???·?????????IBIS????·??????????ê????????°ü?¨????????·? ????????????????????????????×è??????????·??????????á??·?????IBIS????????????????????????????×??·??????·??????ü???????ì??×????é?????????±???????????????????°?????????í??????·¨???????é????
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   ?±????IBIS?????ê???????ü???????????±????
v?í?à?????§???±·???IBIS???????§???????±·?IBIS??????IBIS?¤??????·¨?¤×÷??????IBIS???????????¤???¨?ò?¨??Spice????×???×???????????????·¨???§??????×????????±????????????×????¤????????????
vIBIS?????í???????í?????±?????????????÷?à???????·????±???????°ü??????·????????·??
v IBIS?±·??????????ù???¨????????IBIS????2.1°?°ü?????è??????????×é?????????????????????á??????·????????????????????ü???¤×÷?????ò?????¨??·??????±?????????????ò????????±??±???ó????????????????±??????????÷????????
??????SPICE?????
   SPICE?¨Simulation Program with Integrated Circuit Emphasis????
IBIS??????SPICE??????±???

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SPICE
IBIS

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IC?§????SPICE?§????·????÷?§??
IC??·????÷?§??

°?±?
Ph.D. thesis, 1972;
SPICE 2G6, 1984
1.0 1993;
3.0 1997

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