我要委托设计网论坛 - Powered by Discuz! Board

标题: [×???]PCB LAYOUT?????ó??---???§??±????? [打印本页]

作者: silverstar 时间: 2004-2-23 17:06 标题: [×???]PCB LAYOUT?????ó??---???§??±?????

PROTEL?à??????
1.???í???????í?ó??
?¨1??ERC±¨????????????????????
a. ???¨·?×°?±???????¨????I/O??????
b.???¨?????ò·????????±??????????????grid????????????????????????
c. ???¨?????±pin·??ò·??ò??±???·?pin name????????
?¨2??????????????????????????????????±í?????????¨??????
?¨3?????¨???¤??????????±í??????·??÷??pcb???ú??netlist?±??????????global??
?¨4???±????×??????¨???à??·?×é?????????±???§?ò????????annotate.
2.PCB???????í?ó??
?¨1???????????±±¨??NODE??????????
a. ???í????????????????pcb??????????·?×°??
b. ???í????????????????pcb????????????????·?×°??
c. ???í????????????????pcb????pin number????????·?×°????????????sch??pin number ??e,b,c, ??pcb????1??2??3??
?¨2???ò???±×????????ò??????????????
a. ???¨pcb???±????????????
b. ?à??????????×?????????pcb°?????????????×?·????????????ù????????×?·??? ????pcb, ???ó????×?·???±???????
?¨3??DRC±¨??????±?·?????????·???
±í?????????????????¨????±¨????????????????CONNECTED COPPER?é????
?í???á???ó??????????WIN2000, ???????????ú?á???à??????????????×???????DDB????????????????????PROTEL???????ú?á??????×÷?????????è????????????????×?????????

??PCB?è?????????????ê???ú?·?è???????????è?????????°????×?±??¤×÷???????ü??×????? ??????PCB?????????????è?????????¨×?????????×??????¤×÷??×??ó??PCB???????????????? ?????????°?à??????????????·?????????????×????????°??????????????×??????????°?? ?????????????¤???????ó±?????????????????????????????????????±?????±????à???????? ?????ú?ú·?????????±????±?????????????????à???????????????à???±?????????×?ú?ú???ú??????

×????????????¨?????????????????????????????ò?????¤???è?¨?? °ü?¨×????????ú?????????¨?×????????????????????????°??????????÷???????????ì????°????????¨?? ???ó??????????????????°??????????????????????????·?????????ü?????ù???è???????????????? ????×???????????????????×????§????

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PCB LAYOUT×???????

1 ???????????????í

??????????PCB°??????????ê???????????????????????? ???????????????????????????????á???ú?·???????????????±?????°?ì???ú?·???????????ù???????? ??????????????????????°??????????ù?ú?ú??????????????×???????????±??¤?ú?·????????

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????×????·??PCB?????í????????×é?????????·, ????????????????????(???????·???????????ù????)
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2????×????·?????????·?????????í

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3???????????????¨????????

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4???ó?????????????????????í

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5??????????????????×÷??

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±ê×????÷?????????????à????0.1????(2.54mm),?ù?????????????ù????°????¨??0.1????(2.54 mm)?ò????0.1????????±?????????0.05??????0.025??????0.02????????

6???è?????ò?ì?é?¨DRC??

?????è???ê???ó???è?????ì?é?????è????·?·????è?????ù???¨?????ò?????±???è?·???ù???¨?????ò??·?·???????°??ú?ú?¤?????è?ó????°??ì?é??????????·?????

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???????????????í????·???????????????????????·????????¨?????¨×è????????PCB????·????????????????í????·???
???????ü??????????·???????×????????????¤??×???????±??¤???????????°??????±??÷????·?????
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??PCB????·??????¤??????×è????·?·????ú?ú?¤???????ó??×è????????·???????×?·?±ê????·??????÷???????????????°?ì??×°??????
?à??°??????????????????ò±?????·???????????????????????????°??????×?ì?????·??????
±??????????????????÷????PADS??????°??è???í??PowerPCB????????°??è?????÷????????×????????????????¤×÷×é???è?????±?á???è????·???·?±??è?????±???????????÷???à???ì?é??

2???è???÷??
PCB???è???÷??·?????±í?????????ò?è???????÷???????????????ì?é?????é???????ù?????è.
2.1 ??±í????
??±í??????????·?·¨????????????PowerLogic??OLE PowerPCB Connection??????????Send Netlist??????OLE?????????????±±??????í????PCB?????????????????????í?????????í????·?·¨???±????PowerPCB??×°????±í??????File->Import???????í???ú??????±í??????????
2.2 ???ò?è??
?????????í???è???×????????°?PCB???è?????ò?è???????°???????????????è??
???????ò?????ò????????±í?±???è?????ò??????±í??????PowerPCB???????????????è?????ò??±??????????í????±??¤???í????PCB?????????????è?????ò?????¨?????????????????ò?è???è????±???Pad Stacks???è??????±ê×????×???ó?????????è???????¨???????????ò???×?????¨??????Layer 25??
×?????
PCB?è?????ò?????¨???????×?è????CAM?????è??????×÷???±??????????????????Default.stp????±í???????????ó??°????è?????????é????°?????????????·??????????????????????è?????ü???????ò?????ù???????ò???è???????ó????PowerLogic????????OLE PowerPCB Connection??Rules From PCB???????ü?????í?????????ò?è????±??¤???í????PCB???????ò??????

作者: silverstar 时间: 2004-2-23 17:06

2.3 ???÷??????
??±í???????ó???ù???????÷?????á·????¤×÷???????????????????????????????¤×÷????°????????÷??·?????°??????????ò°?·????????????÷????????PowerPCB?á????????·?·¨?????¤??????×?????????2.3.1 ???¤????
1. ?¤??????°????á??????????°?±??¨Board Outline????
2. ?????÷??·????¨Disperse Components???????÷???á??????°?±??????§??
3. °????÷????????????????????×???·???°?±???????°??????¨?????ò°?·???????
2.3.2 ×???????
PowerPCB?á????×?????????×??????????????????????ó?à?????è?????????§???????í????????????????2.3.3 ×???????
a. ???????×?????ò??±??¤?????????¨?????????÷???±×???·???????????°??????????????÷??·???????
b. ??×??÷?????????÷????·?????????????
c. ???????????????ü?÷????VCC
d. ·????÷???±?????????ó??????????????????
e. ?à?????í???á????Array??Union???????á?????????§??

2.4 ????
??????·????????????????¤??????×?????????PowerPCB?á???????¤??????????·????ó??°ü?¨×??????·???????è?????ò?ì?é?¨DRC????×?????????Specctra?????????????????¨????????·?·¨???????????????????è?????¤??×????????¤??
2.4.1 ???¤????
1. ×????????°?????????¤??????????????????±????????±?????÷?????????????????ù?ù??×????à???????í???????à????±??????????????ó???í??????????·?×°????BGA??×????????????????????ò???????????¤??????
2. ×??????????ó???????????¤??????PCB??×????????÷????
2.4.2 ×???????
???¤?????á?????ó??????????????????×????????÷??×?????????Tools->SPECCTRA??????Specctra?????÷?????????è????DO??????°?Continue????????Specctra?????÷×??????????á???ó???????¨????100%???????????????????¤?÷??????????????????100%?????÷?????ò???¤?????????????è???÷???????ò???¤???????±?????????¨??????

2.4.3 ×???????
a. ????????????????????
b. ??????????????VCC?±??????
c. ?è??Specctra??DO?????±???×???í??Protect all wires?ü????±??¤???¤????????±?×????????÷????
d. ???????ì?????????????????????¨????Split/mixed Plane???????????°????·????????ê?????ó??????Pour Manager??Plane Connect????????
e. ???ù?????÷???????è??????????·?????×?·¨????Filter?è??Pins???????ù??????????????????????Thermal?????°?ò??
f. ?????????±°?DRC?????ò?????????????????¨Dynamic Route??

2.5 ?ì?é
?ì?é???????????à?¨Clearance???????????¨Connectivity???????????ò?¨High Speed???????????¨Plane????????????????????Tools->Verify Design???????????è???????????ò??±????ì?é??·??ò?????????????????ì?é???í?ó??±???????????????????
×?????
?????í?ó??????????????????????????Outline??????·?·?????°??ò?????ì?é???à?±?á???í???í????????????×????????×???ó????????????????????
2.6 ???é
???é?ù???°PCB?ì?é±í?±??????°ü?¨?è?????ò?????¨???????í?????à???????????×?è???????????????é?÷???????????í????????????????????×??????????±????????×???????±?????????????°?·??????????????é?????????è?????????????????????????????ó?????é?????è????·?±???×???

2.7 ?è??????
PCB?è?????????????ò???ú?ò???????????????ò???ú????°?PCB·????ò????±????è?????????é???ì?é????????????????°??§?????ú?ú????°???????????????????·??????????????????è??????°?????????×??????÷??????????????×?????????
a. ?è???????????????????¨°ü?¨???????×?????????????????????????¨°ü?¨VCC????GND?????????????¨°ü?¨???????????×??????????×è?????¨°ü?¨????×è?????×??×è???????í???????ú??×ê?×?????¨NC Drill??
b. ???????????è????Split/Mixed????????Add Document?°????Document??????Routing?????????????????????????°????????PCB??????Pour Manager??Plane Connect???????????????è????CAM Plane???ò????Plane?????è??Layer?????±?ò????°?Layer25????????Layer25????????Pads??Viasc. ???è±??è???°???¨°?Device Setup??????Aperture????????199
d. ???è????????Layer?±????Board Outline????
e. ?è??????????Layer?±??????????Part Type???????????¨?×??????????????Outline??Text??Line
f. ?è??×è??????Layer?±?????????×±í?????×??????×è???????????×±í????×è???????????é???·?¨
g. ?ú??×ê?×?????±??????PowerPCB???±???è????????×÷????????
h. ?ù?????????????????ó????CAM350?ò?????ò???????è?????????é???ù???°PCB?ì?é±í?±?ì?é
???×?¨via?????à??PCB??????×é????·???????×ê?×??·????¨????PCB??°?·?????30%??40%???ò??????????PCB???????????×???????????????×????×÷???????????×????·??????à????????×÷?÷??????????????????????×÷?÷???????¨?ò?¨???????????¤?????????????????????×??°???·??????à?????¤?×(blind via)?????×(buried via)???¨?×(through via)???¤?×???????????·°??????????×??±í???????????¨??????????±í?????·???????????????·?????????×???????¨???????????¨??±???(?×??)?????×???????????????·°????????????×???ü???á???ì?????·°???±í???????????à?×?????????·°??????????????°?????¨?×?????¤???ê?????????×?????????????????á????×????????????????????????¨?×???????×???????????·°??????????????????????ò×÷????????°?×°?¨???×???????¨?×???¤?????ü?×??????????±????????ù?????ó??·????????·°??ù?????ü?????????í?????????×???????ù???????×?????????????÷?????ù×÷???¨?×??????
???è?????????????????????×?÷??????????·?×é??????????????×ê?×?¨drill hole??,????×ê?×???§????????????????????????·????????ó?????¨?????×???ó??????????????????,????????PCB?è???±???è????×??????????×?????????????ù°????????????ü?à?????????????????????×????????×??í?????ú?????????????ü???????????????·?????×?????????????±????????±????????????????×???????????????????????????ü????×ê?×(drill)???????¨plating?????¤???????????????×??????×ê?×?è?¨·????±?????¤?????????×?????????????????±?×??????????×ê?×?±????6±??±??????·¨±??¤?×±????ù????????±??????????????????é6??PCB°????????¨?¨?×????????50Mil×ó?????ù??PCB?§?????á????×ê?×?±??×???????????8Mil??

作者: silverstar 时间: 2004-2-23 17:07

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C=1.41??TD1/(D2-D1)
???×?????ú?????á?????·?ì?????÷???°?ì?????¤?????????????±?????????????·?????????????????????????é??????50Mil??PCB°?????????????????10Mil???????±????20Mil?????×???????????????????à????32Mil,?ò?????????¨?????????????ü?????????×?????ú?????ó??????C=1.41x4.4x0.050x0.020/(0.032-0.020)=0.517pF??????·????????????????±??±?????????T10-90=2.2C(Z0/2)=2.2x0.517x(55/2)=31.28ps ?????????????????????????????????×?????ú????????????????±??????§?????????÷????????????×??????à?????????×?????????????????è???????????÷??????????

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L=5.08h[ln(4h/d)+1]????L?????×????????h?????×???¤????d??????×ê?×???±???????????????????????×???±???????????°?ì???????????????°?ì×??ó???????×???¤????????????????????×????????????????×??????????L=5.08x0.050[ln(4x0.050/0.010)+1]=1.015nH ?????????????????±????1ns???????????§×è???ó??????XL=??L/T10-90=3.19???????ù??×è?????????????÷???¨????????????±?????????±???×????????·?????????????????????????±?ò?è???¨?????????×?????ù???×?????ú???????á??±???????

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1??????±?????????????·????????????????í?????????×?ó????±?????6-10??????
?????éPCB?è????????????10/20Mil?¨×ê?×/???????????×??????????????????????????????°?×?????????????????8/18Mil?????×?????°?????????????????????ü???????????×?????????????ò?????????×?ò???????????????ó????????????×è????
2????????????????????????????????????±???PCB°??????????????×????????
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5?????????????????×???ü·????????????????×????±????????á??×??ü?????·????????????PCB°????ó??·????????à?à?????????×???±???????è???±???è???é???à±????°???????????×???????????ù?????????é???????????±?ò????????????????????????????????????????±????????×????·????ó???é???????????á???????????????????????????·???????????????ù?????????????????×???????????????????????????×??????????????????????????

作者: silverstar 时间: 2004-2-23 17:07

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