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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑 9 Z; S1 w4 j6 |
; Q2 K$ e) y9 b- z2 k6 r7 J/ C典型的100ohm LVDS差分传输线,Hyperlynx场解析器的概念性错误! q6 p% O3 m6 \% W; u' b' n4 Q0 U
0 s Z: B% t# w9 f# I1 Z- s0 YField Solver Result:# R" a1 _5 V, j. h/ ?
Differential Z = 100.5 ohms4 W, D3 m* c. l2 i5 o$ h& k
(suggested single line-to-line resistor for differential signals;4 ^! b0 Y- N' x# i6 v6 i0 b4 ?/ {8 D- N) @
works best for opposed, balanced transitions) }( ]4 X; H/ J F
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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)1 h; g! B) X0 _3 C; T2 T8 A8 K
(suggested single line-to-ground resistor for common-mode signals;
/ k, u$ k2 Q8 \$ M0 t; u1 o works best for all-1's or all-0's transitions)
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X& }) G1 h' W. wLine-to-ground Z = 66.9 ohms, A' v1 k$ S. N# |
(suggested single line-to-ground resistor for independent signals;7 P4 A7 u; g7 a9 G: ~
works best for mixed 1's and 0's transitions) |
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