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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑 . P4 ?: H" F2 C+ h) n
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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5 k' X# c7 X! F! I: |. P
4 h' e; l& f* ~; ?Field Solver Result：
" r; a8 h, d* u! E) n8 V9 _Differential Z = 100.5 ohms
' ~$ S# l& Q& Q" W7 x (suggested single line-to-line resistor for differential signals;0 h4 m, j# w/ P4 q: U& Z+ r+ x
works best for opposed, balanced transitions)
/ Q. }/ h' f4 j6 Z; `* j& \* ?& d, Z2 o( Q
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）
. a# ?2 f) ]3 W* C1 X (suggested single line-to-ground resistor for common-mode signals;
+ \3 W' U6 e; j works best for all-1's or all-0's transitions)4 U) @8 a& Q( z2 H' m! R
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Line-to-ground Z = 66.9 ohms, X; z3 T& L6 \
(suggested single line-to-ground resistor for independent signals;
' z3 }2 s3 ~: q) `6 O! `4 W! Y% S 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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