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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: p( k7 D' R5 ]1 V7 Q
. A( f i- V6 p# s- ~+ {6 g' g, ^Field Solver Result:
" D. U; y4 \- a' }' d; wDifferential Z = 100.5 ohms
# p; o3 D0 a! D% p2 F2 b7 T (suggested single line-to-line resistor for differential signals;
5 q$ ^; a) Z/ Z* j& G8 N works best for opposed, balanced transitions)! G+ ^% n4 W- n8 _8 A9 Z/ i
, y* E, Q* q0 F% j6 Z$ |8 H2 Q: 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)! L7 j7 v3 `/ c. J, w9 A' g
(suggested single line-to-ground resistor for common-mode signals;
8 L3 q' O$ a, k( o8 G works best for all-1's or all-0's transitions)
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3 X% M X8 g- m7 Z3 WLine-to-ground Z = 66.9 ohms
5 O1 t8 S* ~0 g' I2 Y (suggested single line-to-ground resistor for independent signals;# l& t# Q: V5 c0 _5 m
works best for mixed 1's and 0's transitions) |
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