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第三讲
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2D场求借器--用来求传输线的RLGC距阵模型,s 参数等....; n) p" i( q; n1 I
以下的例子为求单根微带线的RLGC模型。) g% P7 f* r$ z- D7 t
------------------------------------------------------------------------------------------网表如下:
! O* c! V2 t1 ~* c a) m5 I*Micro Stripline& g' q% @% t) \, Z1 V9 B: p
*Stripline.sp : caluclate Micro stripline's s parament&rlgc model[*.s4p&*.rlgc]$ f0 u) P0 }/ a: ?
*created by Li Liming
5 T. y- @1 \5 v( {, A# o*****************************************************" |% V3 u7 y( @' K
* Material FR-4 单微带线截面图。# |! n t9 K8 p" { O, e
* Stack layer. t4 [! z3 t: y. [9 }
*////////////////Width//////////////////Thickness
" U. C1 ^- m+ J, Z*///////////////////////////////////////dHeight# @/ N+ t! a! Q* c5 K! ^, L
*---------------------------------------Thickness7 `& k$ i, B A" B4 l3 ^
******************************************************
3 I" ~0 _- O7 z3 D.param dHeight=8mil
7 `& t* x( k" y1 P% P" J4 s6 |.param Width =5mil
/ g$ @# R5 r+ ]$ p! ].param Thickness=1.2mil
* j! a: U, S# Y, B6 B+ n: u+ U.param Length=5000mil1 l, M& \. Q$ O: }1 _ c; I) b: h
1 ^5 u- K+ }+ ~* O. h*******信号源*******
& [- O$ l/ [5 p Q- ~, M7 s! ~vimpulse in 0 pulse (1.8v 0v 0ps 25ps 25ps 450ps)+ _ h# X! g6 ~( s9 D
wline in 0 out 0 fsmodel=strip N=1 l=Length
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*******定义2种材料*******
2 m* O* R% Z' l, @$ r6 Q% _.material die dielectric er=4.3 losstangent=0.017
, }6 p4 O1 q) i" h- p6 R/ ^" W.material copper metal conductivity=57.6meg
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*******定义走线的参数,如形状,长度,厚度*******
7 f5 Q, @* ?! G! _, h+ }: Z# c.shape trace rectangle width=Width height=Thickness
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: e0 p1 \& k: {( k; U*******定义层叠, 注意层叠是从下往上的。*******
' A$ v; l [+ g0 W ]: G.layerstack stack
! Y2 i/ B; N, B2 I0 B+layer=(copper,Thickness) layer=(die,dHeight)
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*******定义仿真精度,格点,输出数据,计算类型*******
& q9 ~4 C7 X( e9 U.fsoptions myOption printdata=yes computeg0=yes computegd=yes computer0=yes
1 F$ [# J/ u. t) q, t, }+ACCURACY = LOW GRIDFACTOR = 1/ M( L+ M6 V0 o* q1 z' V' [
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*******定义扫描过程*******
9 ~8 i& u; _. ~- `8 a.model strip w modeltype=fieldsolver8 v+ X. k- Z: x. t" {8 R
+layerstack=stack2 t* H5 x9 D" H4 B9 S* a& p' {
+fsoptions=myOption
& s5 [. W8 }, ~ o, k+rlgcfile=micro_stripline.rlgc
( H, o; ?9 Z* c8 t1 }8 N& I+outputformat=rlgcfile
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f u! @+ \3 F! o! {) a4 K******把导体放置在平面上,用如下坐标定义他们的位置*********7 \' e D0 \$ D0 o! ?, C" w
+conductor=(shape=trace origin=(0mil,'dHeight+Thickness') material=copper type=signal)
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*******分析类型*******" f6 z% `6 ~- }, ~& J0 y! \8 d
.tran 0.5ns 100ns
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运行成功后会在当前目录下生成micro_stripline.rlgc文件,供仿真案例调用。6 Q7 E* p: g1 ]; l. A* Z- G6 w
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2.波形图/ D: J0 g5 h9 j" ^ W
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