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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑 ; h- q6 n4 C5 U1 J
; A' G) F2 r' S$ P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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$ ^0 E( p% I/ \0 ?Field Solver Result:
6 E% f2 G" P; _ b2 J3 zDifferential Z = 100.5 ohms3 {9 J* }3 Z8 T' N. E8 P
(suggested single line-to-line resistor for differential signals;
, J7 f, r3 s* \! G works best for opposed, balanced transitions)- V {' x. |4 ]! [6 D: E' }3 x
' S) g# c1 Z* \" r1 }
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)1 Q* {! }& S# n" s5 M$ r
(suggested single line-to-ground resistor for common-mode signals;
! n8 B4 [- @$ N- b works best for all-1's or all-0's transitions)
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- P9 k n" x9 u% B/ sLine-to-ground Z = 66.9 ohms
1 q+ Y* C4 y7 R+ w7 ^6 P0 a (suggested single line-to-ground resistor for independent signals;! \ i8 q) V. \, }
works best for mixed 1's and 0's transitions) |
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