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Differential Trace Impedance --by Dr. Howard Johnson

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·¢±íÓÚ 2002-8-20 18:07:00 | ÏÔʾȫ²¿Â¥²ã |ÔĶÁģʽ
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·¢±íÓÚ 2002-8-20 18:25:00 | ÏÔʾȫ²¿Â¥²ã
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·¢±íÓÚ 2002-8-21 08:17:00 | ÏÔʾȫ²¿Â¥²ã
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·¢±íÓÚ 2002-9-9 23:27:00 | ÏÔʾȫ²¿Â¥²ã
®t²§ Trace Impedance --by Dr?  Howard Johnson??§Ü?


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microstrip routing . §Ú&# 39 ; ¨Ï¥Î·¥©Ê³]³Æ?
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©M??¤¹³\?(?)¥Î¾B±»³o?Âܸñ?
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?ºû?»â°ì(¥Ð?)¸Ñºâ¾÷?(?) 39 shouldn&# ; T «H¥ô?
¥¦? results .§Ú¹ï¤£«H¥ô¦³??³o?ºë½T??
?¨Ò?¤¤?(?)´£¨Ñ??

1¤é Åý§Úµ¹?(?)?¨Ç???²z(?«h)?
À°??(?)²z¸Ñ ¤°»ò&# 39 ; S µo¥ÍµM? §Ú&# 39 ; ?
±Æ°£???­Y?¿ìªk(·»²G)?

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¤¤?¸òÀH»P?¼Ò¦¡??????
¹q(¼é)¬y?©TÅé¾ÉÅé¤è?¬y°Ê? ³o sounds .
?·í¶w?, ?¬O, ¥¦&# 39 ; ??¤è?À°??(?)?S ?
?­n¸ô(¤èªk), ??¥¦(³o)±NÀ°??(?)??(??)¬O¤°»ò?
·í?(?)?µo¥Í§ïÅܳo?Âܸñ´X?¾Ç?

·í³o?ºë?¹êÅç(¸ÕÅç)?¸òÀH§Ú¸ò??¤ÀÄÁ?
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?¾÷´î¤Ö(?)¥¦??§Ü?

( 2 ) ¨Ï??Âܸñ?? ( §Ú.e ? , increasing ¥¦? .
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( 3 ) ¨Ï??·L±a²¾°Ê»·Â÷¶i?¨B(?»·)?
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( 4 ) ©¹Âܸñ¼s?¼W?????
¥¦? ?§Ü .

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?(?)¥²¶·»¡?Â÷?(?)?¶ZÂ÷?
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??¼Æ¹ï?§Ü?¼vÅT? ¤¤?´þ??
¤¤³¡¬O??¥­µ¥??­n?¾÷?

Åý&# 39 ; ²{?S ¥Î·Q¹³®t²§¬[ºc?
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?- Âܸñ?¬[ºc??§Ü? [µ§°O: ??-
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?¯S¼Ò¦¡?§Ü? ]

?ªG¤ñ¸û»·?¸m?(?)?¨â?Âܸñ, ????¦³?

?(?)?·s®t²§´ú¶q±N¬O½T¤Á??
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( 5 ) ??®t²§?§Ü¼sªx?
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©¯¹B(Á«), ?(?)?°÷?°£·Ð´o??(«Bºw)?
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( 8 ) ??«O?¸g±`(¤£ÅÜ)?§Ü, ?
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?(?)?¸g(³Q)µ¹?(³o¨Ç)±M?¤¶²Ð(±ÀÂË)?

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§Ö³tÄÀ? - 4 ??? 16 - ±Kº¸?Âܸñ??§Ü?¸g¸¨(?)??
? 50 ?¼Ú©i??, ¨º»ò³o?®t²§?§Ü±N?
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? ¥Î .?(?)?°÷¨º¸Ì±Æ°£ 16 - ±Kº¸?
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??¦Ò¼{¨Ï¥Î¤ñ??±K¶°(«p)(²Ê)¹q¸Ñ½è?
?(?)´£???

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¤£?? .¥Î 8 - ±Kº¸±qÂù(¹ï) 5 - ±Kº¸¼s(¼e)¬P¬P?
?¶¡, ¼W?Âܸñ¼s?? 6 ±Kº¸±N?
?³o??§Ü, ??§â³o?¶¡¶Z´î¤Ö(?)??
6.5 ±Kº¸±N?¥¦(³o)??¶i?¨B(?»·)? ??, ?? .
?³o¨Çµ²ªG¤¤?©w¿ù»~? ??¤£??±N¨Ó¬O???
100-¼Ú©i solutions .??, §ÚÃhºÃ¬Y¨Æ(¬Y?)?
¬O©Î?¤ò¯f?(?)? ADSlinecalc ??¨©, ©Î??
(´±§Ú»¡¥¦(³o)) ?(?)??¨ã?¨Ï¥Î(¥Î³B)?

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(HyperLynx) .©Ò¦³³o¨Çµ²?³£À³¸Óµ¹?(?)?
??? 100 - ¼Ú©i?®t²§·L±a?§Ü?
(³o¨Ç)???±ø¥ó:

- ¹q¸Ñ½è?«p?= 5 ±Kº¸?



- Âܸñ?«p?= 1 / 2 - ¯s? ? ±±?¸Ë¸m + 1 - ¯s? ½L??
(1.5-¯s? Á`­p?)

- ¨S¦³²k??¨ã ( *** ?(?)?¨ÑÀ³°Ó¤°»ò??¼W²K?
²k?±»¹¢ ,?©Î??±N¦³¨Ç´î¤Ö?
°lÂܼs?(?)À±¸ÉÃB???
(³o¨Ç)Âܸñ???¹q¸Ñ½è???


?X ¬Oµ²??¨º¸Ì, ¶i?½L?Âܸñ¼s??
±Kº¸, ??Y ¬Oµ²??, ½L?Ãä- ?- Ãä?
±Kº¸?¤ÀÂ÷?

100 - ¼Ú©i ®t²§ MICROSTRIP DIMENSIONS ?
( h=0.005 ", äz=4.3 ?©Ò¦³? 1.5-¯s? ±±?¸Ë¸m .

w s .
8 14
7 11

6 7
5 5

?(?)¹çÄ@¦æ, °í?¨º?(?)?¤ìªO?
»s³y°Ó©±?¸m®t²§?§Ü´úÅç?
?(?)??ªO?? coupons ©M´ú¸Õ¨C?­n?¹ê(ÃÒ¹ê)?
?(?)(¬O)±o?³o?¥¿½T??§Ü?

?§Ú??³s±µ? 100 - ¼Ú©i??????
stripline configurations .?Åã?, ³o¥¿¸q(¤½¥¿)?
©Ò¦³??µ²???©â¼Ë? ä¡ ³o .

"h"¶W?³Ì¾a??Âܸñ?°ª(?)?

Ãä¤ÀÂ÷, ±Kº¸?©Ò¦³? °Ñ¼Æ rSKIN ¬O?

Z0 ¬O (?°ªÀW? &# 118alue ) ¯S©Ê?
?§Ü, ??Áa?°O¸¹(¦¨ÁZ)?"dB/in? @1GHz"¬O?
¥Ñ?¥Ö½§?À³?Âܸñ°I´î, ¶i??
?·¥Å鳡¥ó/ä¡ ., ? 1 ??»® ???ÀW²v? ?¥Í&# 39 ; T §Ñ°O?
?¼Ë, ¦Ò¼{¹q¸Ñ½è·l¥¢? ©Ò¦³³o? stripline ?

¥Î 1??»® äz=4.3 ?Ũ©³?

§Ú?±æ³o?¸ê°T¹ï?(?)¦³¥Î?


³Ì?? Regards,
Howard ³Õ? ¸â´Ë ?


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