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请问各位大虾，1、HyperLynx对PCB板做快速串扰分析时，需要加入器件IBIS模型吗？2、在加入IBIS模型之后，串扰的值一般是多大，不影响设计？
8 A, x5 }- @$ {8 Y我在DXP下面找了个example,对其进行快速串扰分析时，不加如IBIS模型，采用默认的模型参数为- s, y" {5 _* L6 z
Board temperature ................ 20.0 degrees C2 z) a+ U7 i7 o+ H3 s% ]
Default IC model (used for quick analysis if IC model is missing)/ @6 r5 v6 ~( ?2 ?2 |+ V
IC driver rise/fall time ..2.000 ns5 j; q% i. K: |& E
IC driver switching voltage range ..3.00 V, N" V6 z9 h& u9 c L8 ~5 W! y
IC driver output impedance 1.0 ohms9 s) Q0 S3 X( k, G+ |# P
IC input capacitance ..... 7.0 pF
+ _9 [5 T1 E2 \5 T$ ?串扰门限为
7 {) I) C# I) G7 l% MMaximum allowed crosstalk ........... 200 mv peak2 Z* e+ ?5 I; `. d! d
特定看一个网络：$ o& q! f3 v) s* \0 k* d. Q
NET = SOFT_TCK
8 t# T. n& h" r6 ^9 l% G2 Y( m ELECTRICALLY ASSOCIATED NETS --------------------------------------
0 Y. K' \; [- h None
/ _' u2 y+ N* [, \9 a5 x AGGRESSOR NETS (Estimated peak crosstalk)
0 i* ^5 L' ~7 i" ]5 O9 R3 x1 t- O NetFPGA1S_B22 .................. 233 mv, {' t( i! _' N) c6 [8 d
Total estimated crosstalk ....................... 233 mv
5 l i+ S) _5 A) r1 z5 F9 K ** Warning ** Estimate exceeds maximum allowed crosstalk!
2 ~8 b3 \. u6 n! N3 f5 }而我分配模型之后，该网络的串扰增加了很多：
3 ?$ K% T9 D( Z" f NET = SOFT_TCK
. ?' F/ j3 o3 ~! @' ^8 X ELECTRICALLY ASSOCIATED NETS --------------------------------------
. E: }9 J. i% E$ _( J* t" [ None) A; Z- H7 n. r3 p
AGGRESSOR NETS (Estimated peak crosstalk)7 n/ d* C; r( i& M+ ^
NetFPGA1S_B22 ..................1268 mv
5 W0 }' T0 \3 `5 X NetFPGA1S_A21 ..................1053 mv# g4 j& n5 W3 g) [3 d
NetFPGA1S_A20 .................. 456 mv
& ^! e; g% c7 M4 [ SOFT_TDI ....................... 319 mv: J& ] K' R8 \- C
DIG5_SEG2 ...................... 227 mv
6 r! I2 h. o. I: W8 ? Sum of the two strongest aggressors .............2321 mv* e# ~/ ], U4 S) A4 v& @
** Warning ** Estimate exceeds maximum allowed crosstalk! |
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发表于 2009-12-21 10:07
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