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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+ p6 N* ?7 A. S* r9 g$ |
2 y% g' e" ^4 P$ RField Solver Result:
) f5 n9 h$ o4 E" O1 K% sDifferential Z = 100.5 ohms
; h* S2 x, ?7 R1 e- F( j (suggested single line-to-line resistor for differential signals;! r7 h" {$ `/ r1 D3 C5 D
works best for opposed, balanced transitions)% y' h7 l$ K( S# U, t+ A
6 u( |2 h, o" z: v( _& b; Z
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)$ F( [5 W X, E( a
(suggested single line-to-ground resistor for common-mode signals;: c$ F% m2 p: S4 e2 g
works best for all-1's or all-0's transitions)# S( D \/ T* F( x
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Line-to-ground Z = 66.9 ohms3 N3 d& b% R; x& C
(suggested single line-to-ground resistor for independent signals;
: B1 {" e3 N& @7 i works best for mixed 1's and 0's transitions) |
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