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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑 8 p! E9 w) z- H4 w+ Q) I y3 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$ ]2 n: p) r3 {- H4 u
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Field Solver Result:) e1 S$ M& v9 L' f& P* R# N
Differential Z = 100.5 ohms
2 [* I a1 G7 H* b, J6 Q1 f (suggested single line-to-line resistor for differential signals;* v* c D8 Y( F. R- b
works best for opposed, balanced transitions)
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. D7 [, D4 D1 A: {% hCommon-mode Z = 83.5 ohms(错在这里,这里求得的值是Even-mode Z,而非Common-mode Z). \% P1 x* A* \, Y/ J/ y/ h5 H8 k
(suggested single line-to-ground resistor for common-mode signals;
+ O6 B) L6 f+ t1 [3 l+ c5 x' w8 h1 s works best for all-1's or all-0's transitions)2 f/ E8 f7 f4 e: T
3 Z8 J* y. F! U9 ?2 ULine-to-ground Z = 66.9 ohms2 l1 Y% J, [1 P9 [( `3 U0 C
(suggested single line-to-ground resistor for independent signals;
/ _# _2 |! m5 _0 t) K% L works best for mixed 1's and 0's transitions) |
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