hspice 問題 有關mos內部電容指令

0918429587

mos內部電容要看Cgs Cgd Cdb Cbs
& n- o* {8 v4 j, `
要怎麼定義用
plot LX??
2 V, [: l" u$ C
, E" b1 Y/ D- I' w# K; G/ c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...
+ k( a+ ^4 S4 n
5 v# H1 h" b6 G$ Y  z----------------------------------------------------------------
***** Gate Capacitance Plots *****
.lib 'your_component_model' lib_corner
.temp operational_temp
' W5 ?+ L" ]. `# A.option dccap=1 post
0 {5 n7 d" I. H4 J( t0 Em1 n_drain n_gate gnd n_bulk l=0.8u w=100u ad=200e-12 as=200e-12
vd n_drain gnd 0
vg n_gate gnd 5
vb n_bulk gnd 0
* l2 |1 S9 J" Q1 j- `- [* D9 ~.dc vd 0 5.0 0.1
.print   CGG=lx18(m1)
+ g- Q/ F9 q; k* N+        CGD=par('-lx19(m1)')
+        CGS=par('-lx20(m1)')
+        CDG=par('-lx32(m1)')
+        CSG=par('lx18(m1) + lx21(m1) + lx32(m1)')
' a1 U9 a. l. D: s& D. R+ |/ S+        CGB=par('lx18(m1) + lx19(m1) + lx20(m1)')
# K. W( }; W! X1 f.ends

0 N3 a1 m' Y' ?# }8 I----------------------------------------------------------------
3 t# `5 P- L9 H0 G: m% ?Six capacitance are reported in the operating point printout
    cd_total = dQD/dVD
    cg_total = dQG/dVG
    cs_total = dQS/dVS
    cb_total = dQB/dVB
; w2 T: b( N4 r. J& C6 c- i    cgs = -dQG/dVS
    cgd = -dQG/dVD
There capcitances include gate-drain, gate-source, and gate-bulk
9 k! f0 }" {; s" c$ _3 ~7 C6 Roverlap capacitance, and drain-bulk and source-bulk diode capacitance.

CGG = dQg/dVG
( ]" [+ L+ ^. v! z0 I* l# h8 D( XCGD = -dQg/dVD
CDG = -dQD/dVG
: [; u  I0 p; M6 c; D; f
The MOS element template printouts for gate capacitance are LX18~LX23
and LX32~LX34.
4 \  t$ e" o+ k+ h6 n
% a5 I, x8 Q5 }- n; ?7 h+ v/ M" i4 hLX18(m) = dQG/dVGB = CGGBO
+ a' T2 p. R7 E0 h. N5 CLX19(m) = dQG/dVDB = CGDBO
  |+ ?1 [* h1 `- Y: |8 LLX20(m) = dQG/dVSB = CGSBO

LX21(m) = dQB/dVGB = CGGBO
LX22(m) = dQB/dVDB = CGGBO
$ E1 v# f# M- t$ K1 A0 ~LX23(m) = dQB/dVSB = CGGBO
* C9 v& y- {8 x7 W, @
LX32(m) = dQD/dVG = CDGBO
LX33(m) = dQD/dVD = CDDBO
, ~* u8 O. t: {$ {LX34(m) = dQD/dVS = CDSBO
+ A$ v0 U) b' {! B1 p9 [& M! H) a
8 y( Y, Y0 t8 B+ I% k7 R, ^! c* `# J3 xThe equation shown above is for an NMOS with source-bulk grounded
  _) x- P1 l. X) Zconfiguration. Refer to the user's manual for more detail ^^

0918429587

CAB_BS    LX28
; K" N5 k7 C6 j; OCAB_BD   LX29

其他我找不到
Cgd Cgs Cgb 可由 lx(19) lx(20) lx(21) 分別 print out
0 C+ p. K0 f& i: d# l, m  i! u這是 CGDBO  CGSBO CBGBO

不一樣

yalon

您得隨手  查一下 manual .

Cgd Cgs Cgb 可由 lx(19) lx(20) lx(21) 分別 print out.
! z: W0 ~) @$ {/ P% g% y) e
  y9 M& B& t+ i+ I
9 L, G. u4 h* T6 I! v% iFor 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