hspice 問題 有關mos內部電容指令

0918429587

mos內部電容要看Cgs Cgd Cdb Cbs

要怎麼定義用
plot LX??
9 e# l6 _. E4 Y# {$ A. K
3 [" J0 `- D( {6 @+ Q% f請各位幫忙一下

chcheng

Refer to "HSPICE User's Manual: Elements and Device Models Vol.II"
An example for your reference...
8 R% Q: a- p: ~2 n' p6 P5 C
/ F& s2 ^! M) V& d! w----------------------------------------------------------------
***** Gate Capacitance Plots *****
.lib 'your_component_model' lib_corner
.temp operational_temp
.option dccap=1 post
7 J8 L" Q3 y3 u2 i) Q7 H' ]7 im1 n_drain n_gate gnd n_bulk l=0.8u w=100u ad=200e-12 as=200e-12
9 ?' l, D9 _/ k  }: a$ c+ Pvd n_drain gnd 0
/ J$ e. U- f: k3 Vvg n_gate gnd 5
4 w6 ^4 {3 r" m1 avb n_bulk gnd 0
.dc vd 0 5.0 0.1
/ j7 ~4 ], f+ `) D.print   CGG=lx18(m1)
+        CGD=par('-lx19(m1)')
* E" F7 c8 R% c+        CGS=par('-lx20(m1)')
+        CDG=par('-lx32(m1)')
+        CSG=par('lx18(m1) + lx21(m1) + lx32(m1)')
# _# d' Y6 ?7 X. F& V& z+        CGB=par('lx18(m1) + lx19(m1) + lx20(m1)')
1 u  Y  U) n% ?& M+ \- V) B" H.ends
( ~& U3 ~7 ]& W$ O4 \! u& G
. s; V( C4 d8 E- }- C----------------------------------------------------------------
Six capacitance are reported in the operating point printout
) p% g( C  x( ^    cd_total = dQD/dVD
; ^8 x. \3 s2 k0 h- }8 X1 u    cg_total = dQG/dVG
9 E, J1 ]: W" B% d7 x# ]    cs_total = dQS/dVS
4 ?, j& X* Z- A    cb_total = dQB/dVB
    cgs = -dQG/dVS
3 ]; x; O5 _' `    cgd = -dQG/dVD
There capcitances include gate-drain, gate-source, and gate-bulk
& x7 u! H- z9 X+ I3 b$ Y+ s- xoverlap capacitance, and drain-bulk and source-bulk diode capacitance.
  @9 n4 M8 a) ?: X( ~! d, Y
CGG = dQg/dVG
CGD = -dQg/dVD
CDG = -dQD/dVG

The MOS element template printouts for gate capacitance are LX18~LX23
) O& U8 R! b. |, W5 x- Vand LX32~LX34.

LX18(m) = dQG/dVGB = CGGBO
" {& P5 [9 d) l0 x5 G& j  a( c: b0 rLX19(m) = dQG/dVDB = CGDBO
# Q7 J$ g, `+ @( Y+ vLX20(m) = dQG/dVSB = CGSBO
& P0 f! `+ G8 S2 W9 |9 y
4 \3 W; s3 F$ d. G' G! ~+ E( DLX21(m) = dQB/dVGB = CGGBO
" v( _! H9 j6 C* Y: MLX22(m) = dQB/dVDB = CGGBO
1 U) K, r& X5 ?6 j* Q  ^' aLX23(m) = dQB/dVSB = CGGBO
; g5 m+ l+ A, W
LX32(m) = dQD/dVG = CDGBO
, D' W) g2 l$ _5 XLX33(m) = dQD/dVD = CDDBO
LX34(m) = dQD/dVS = CDSBO
' X& f( V( p$ B, Q) q
( M1 u" i/ _& |The equation shown above is for an NMOS with source-bulk grounded
7 w! M: m# v* `: L; H) C' ?configuration. Refer to the user's manual for more detail ^^

0918429587

CAB_BS    LX28
CAB_BD   LX29
- v. w) f. L$ p+ N' e, `& u( v/ h
/ P6 g6 x8 g( q: t+ s, h其他我找不到
, b+ o. Z7 j' X& y6 ]Cgd Cgs Cgb 可由 lx(19) lx(20) lx(21) 分別 print out
這是 CGDBO  CGSBO CBGBO
3 }4 q* i6 [/ B
2 Z( a2 i' Z/ Z! S( R& ]" P7 l/ V不一樣

yalon

您得隨手  查一下 manual .
8 [  v4 s3 l2 E8 w! o# B
Cgd Cgs Cgb 可由 lx(19) lx(20) lx(21) 分別 print out.

1 [6 c- ^' B9 [/ h+ s1 ^* W# G
0 \8 F( S8 O4 M: P8 @% `) OFor your reference.

小朱仔

直接下.op及.probe
找*.lis檔(模擬產生出來的檔)裡的MOS就可以看到您要的C值了