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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑 * [% D( T1 r& J3 G$ g
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典型的100ohm LVDS差分传输线，Hyperlynx场解析器的概念性错误. k* |" u" T5 k
8 {6 e2 Y" u- H8 A: T) R. c7 ?- Y6 a8 r FField Solver Result：
* t% `! o% {* l6 ], T# j9 vDifferential Z = 100.5 ohms
* V p( d# v R; M (suggested single line-to-line resistor for differential signals;
7 [3 a0 m# b9 S7 a9 r/ Z1 o, M works best for opposed, balanced transitions)
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, D$ ]* |0 ?9 a$ \8 [! e( V5 L$ yCommon-mode Z = 83.5 ohms（错在这里，这里求得的值是Even-mode Z，而非Common-mode Z）
( r9 ]+ A- b/ o8 j. H* F: ? (suggested single line-to-ground resistor for common-mode signals;
, q. r( L q+ i! ^ works best for all-1's or all-0's transitions)
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$ {6 a A. t$ M2 g mLine-to-ground Z = 66.9 ohms$ F' f L7 L. l, f @" Q! u8 i6 r' j
(suggested single line-to-ground resistor for independent signals;7 J4 ^1 B. y3 y* F( u6 d
works best for mixed 1's and 0's transitions) |
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发表于 2009-1-3 22:13
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