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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑
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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
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Field Solver Result：
$ g! B. M( \ ?Differential Z = 100.5 ohms! |6 Z7 H4 X9 b( p6 `, y$ A
(suggested single line-to-line resistor for differential signals;
- }! E2 j0 @# ^1 q# G) M2 g( ^6 @ works best for opposed, balanced transitions)
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Common-mode Z = 83.5 ohms（错在这里，这里求得的值是Even-mode Z，而非Common-mode Z）$ U9 o, K s8 V7 B" m. s
(suggested single line-to-ground resistor for common-mode signals;
. Q; N& x i8 x! k& y2 B works best for all-1's or all-0's transitions)! V0 n1 V' z; h: E& R; r1 Q
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Line-to-ground Z = 66.9 ohms
3 w! A, X2 H8 w% O3 U: O2 e( K6 m (suggested single line-to-ground resistor for independent signals;
! G0 @3 l/ p0 u6 o8 W8 Y, _( [ 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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