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标题: 软件中的问题你注意到了吗? [打印本页]

作者: forevercgh    时间: 2009-1-3 22:13
标题: 软件中的问题你注意到了吗?
本帖最后由 forevercgh 于 2009-1-3 22:16 编辑 $ l% {) d$ m) h( x& ]
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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& W$ d" D0 j  P* ^- |$ V! [

/ g' L$ l' y* E- ^Field Solver Result:
, ~; P0 A" K9 O5 bDifferential Z   = 100.5 ohms# V' q2 s3 c, U  K4 N0 }; g
   (suggested single line-to-line resistor for differential signals;* _$ ~) o8 |, Y
    works best for opposed, balanced transitions)# G0 ]0 N; j4 l0 T' T+ t% }* B6 Q
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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
4 O  X8 t  e9 t# n2 ^* ?   (suggested single line-to-ground resistor for common-mode signals;
/ H/ ]1 j! P4 j8 f    works best for all-1's or all-0's transitions)5 m5 H. ]7 a1 f; G6 x2 k  P4 U7 k6 O

! W) E# j( b! h! S. a6 U$ ~# iLine-to-ground Z = 66.9 ohms7 i, P$ R# k- a
   (suggested single line-to-ground resistor for independent signals;
; \% f) F/ }1 U; Z  r5 w    works best for mixed 1's and 0's transitions)




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