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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑 / X0 q0 E/ V) [; `
4 b6 ?2 S! \6 C- ]! r8 |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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" F. S' U4 i8 X% a4 B, O1 hField Solver Result:
3 e2 {3 \# M @7 b5 X8 DDifferential Z = 100.5 ohms
4 \/ E j$ x- }, A( V (suggested single line-to-line resistor for differential signals;
2 {3 J) M7 K$ Y4 c2 ~ works best for opposed, balanced transitions)
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) ?! S0 R7 @9 tCommon-mode Z = 83.5 ohms(错在这里,这里求得的值是Even-mode Z,而非Common-mode Z)# O2 r7 k) }2 \7 ]# ~. S9 y C+ m
(suggested single line-to-ground resistor for common-mode signals;) y! O+ }9 ^/ T u
works best for all-1's or all-0's transitions)3 N* l; F1 t0 `/ t
" i4 ]) G( {& t& v7 v0 ULine-to-ground Z = 66.9 ohms* E7 y3 ^2 d7 c8 K/ K7 z
(suggested single line-to-ground resistor for independent signals;: E; }3 d$ E h O x( S ?1 V, V
works best for mixed 1's and 0's transitions) |
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