有關hspice inverter chain design

ShengKuanLa@FB

不好意思，大學修積體電路導論，目前的作業出到inverter chain 但卡在這好久，麻煩前輩們解惑了!問題是4階inverter chain，條件給了minimum size還有基本的cl 1pf等等，我用了網路建議的f=3.8試看看，第一關跑圖就失敗了。。。tr0跑出來的圖形歪七扭八整片顏色。。。下面是我的gedit inv.sp


*****circuit****
: V- O+ e* Z; X  T8 Q4 n.subckt sub1 in out vdd vss
3 Q! S& d# f; jMp1 out in vdd vdd P_18 w=3u l=0.18u m=1
Mn1 out in vss vss N_18 w=1u l=0.18u m=1
& `0 w) j- U& O$ f9 h3 u.ends sub1
, i& \0 s2 K2 h9 i0 D' q
7 P6 u; L7 v% }.subckt sub2 in out vdd vss
4 }6 v% ~/ ?' f  O: cMp2 out in vdd vdd P_18 w=11.4u l=0.18 m=2
Mn2 out in vss vss N_18 w=3.8u l=0.18u m=2
. {$ h0 g( \. @& m+ ]; N* a# \.ends sub2

.subckt sub3 in out vdd vss
3 b( f; g7 R8 {/ ^. u7 ]Mp3 out in vdd vdd P_18 w=43.32u l=0.18u m=3
Mn3 out in vss vss N_18 w=14.44u l=0.18u m=3
.ends sub3

.subckt sub4 in out vdd vss
Mp4 out in vdd vdd P_18 w=164.6u l=0.18u m=4
- l0 u; H3 b+ z  ]Mn4 out in vss vss N_18 w=54.87u l=0.18u m=4
1 x' s) m2 B6 g.ends sub4
0 M3 _& G! k  r4 y* F
xsub1 a b c 0 sub1
% m) \6 h4 R! y. S7 ~. ]xsub2 b d e 0 sub2
& B0 A! M5 X/ N; g- c7 txsub3 d f g 0 sub3
xsub4 f h i 0 sub4
) l, V1 |8 m4 z9 gcl h 0 1pf
$ _# ~* c% ?0 I7 ^! W$ c, A/ d
; x7 I! w% p$ `% H/ w+ Q- t
: |9 F3 V' X+ M. U  z8 W*****source******
* z& D: a! ?$ N3 y! R9 fvdd c 0 1.8
vdd e 0 1.8
vdd g 0 1.8
vdd i 0 1.8
9 A+ O+ I6 D7 F6 H/ X# Y7 Mvgnd vss 0 0
vin a 0 pulse(0 1.8 1n 0.5n 0.5n 4.5n 10n)
*vin a 0 0.9

' W- ?+ w) F/ }+ }: T) A0 k