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本帖最后由 forevercgh 于 2009-1-3 22:16 编辑
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1 _8 f% o/ V7 J2 c. B. j! c4 x典型的100ohm LVDS差分传输线,Hyperlynx场解析器的概念性错误6 ^1 n: i$ D0 G$ R
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Field Solver Result:
, P" M5 |* U$ K8 ^' W. F; N& \Differential Z = 100.5 ohms
0 j) h+ N5 ]6 S4 c" c (suggested single line-to-line resistor for differential signals;' R( C( l6 ~3 C3 W9 P5 _: L
works best for opposed, balanced transitions)1 ~& j' n9 o0 C6 O! L
% c% t, `4 ]/ h* V' M5 N. jCommon-mode Z = 83.5 ohms(错在这里,这里求得的值是Even-mode Z,而非Common-mode Z)
4 O7 n' S# x/ F$ Q (suggested single line-to-ground resistor for common-mode signals;
9 L. ]' {+ ~9 L" v- [; J works best for all-1's or all-0's transitions)
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Line-to-ground Z = 66.9 ohms
& ^) l6 f6 F3 Z (suggested single line-to-ground resistor for independent signals;. S; n$ o) J) G5 b
works best for mixed 1's and 0's transitions) |
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