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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7 Z4 i5 E+ {1 F4 O0 l
" ^4 ~/ r$ ?" z& ^& J F' yField Solver Result:
, y1 }& s" C# {! JDifferential Z = 100.5 ohms
, R& W. n5 p/ z" ]2 Y (suggested single line-to-line resistor for differential signals;3 [5 Y+ D; G, d( Z9 J% r i
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)/ U- H# |( g1 ?. O) ?; o& E
(suggested single line-to-ground resistor for common-mode signals;, y8 [7 n6 D5 W; M0 O# i7 y! m5 ^" z. ~
works best for all-1's or all-0's transitions)
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Line-to-ground Z = 66.9 ohms- ?: D J J9 |/ l2 W1 F k
(suggested single line-to-ground resistor for independent signals;
- p7 w- m4 L( y1 l I, q2 F8 x! } works best for mixed 1's and 0's transitions) |
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