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標題:
op設計
[打印本頁]
作者:
stevenzhou
時間:
2007-12-30 08:36 PM
標題:
op設計
我想請問
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我最近把以前模擬過的一顆op
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想由.35換成.18的製程
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可是有幾顆電晶體都一直無法調整至saturation region 他都工作在triode region
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想請問spice模擬的電晶體 工作在saturation region 的條件為何
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有什麼技巧可以讓電晶體工作在saturation region ?
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folded-cascade opamp
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.prot
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.lib 'mm018.l' TT
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.unprot
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VDD vdd 0 DC 3.3v
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VIN+ vin+ 0 DC 1v AC 1V
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VIN- vin- 0 DC 1v
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VBIASP vbiasp 1 DC 0v
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VBIASN vbiasn 0 DC 1v
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m1 7 vin- 1 vdd pch w=15u l=1u m=1
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m2 6 vin+ 1 vdd pch w=15u l=1u m=1
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M9 7 vbiasn 0 0 nch W=5u L=1u m=1
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M10 6 vbiasn 0 0 nch W=5u L=1u m=1
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M11 1 vbiasp vdd vdd pch W=10u L=1u m=30
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.op
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.end
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//
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//1 ****** HSPICE -- U-2003.09-SP1 (20031115) 20:34:49 12/30/2007 pcnt
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******
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folded-cascade opamp
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****** operating point information tnom= 25.000 temp= 25.000
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******
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***** operating point status is all simulation time is 0.
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node =voltage node =voltage node =voltage
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+0:1 = 2.6291 0:6 = 2.1972 0:7 = 2.1972
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+0:vbiasn = 1.0000 0:vbiasp = 2.6291 0:vdd = 3.3000
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+0:vin+ = 1.0000 0:vin- = 1.0000
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**** voltage sources
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subckt
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element 0:vdd 0:vin+ 0:vin- 0:vbiasp 0:vbiasn
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volts 3.3000 1.0000 1.0000 0. 1.0000
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current -481.6364u 0. 0. 0. 0.
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power 1.5894m 0. 0. 0. 0.
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total voltage source power dissipation= 1.5894m watts
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**** mosfets
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subckt
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element 0:m1 0:m2 0:m9 0:m10 0:m11
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model 0:pch.2 0:pch.2 0:nch.5 0:nch.5 0:pch.5
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region Linear Linear Saturati Saturati Saturati
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id -240.8182u -240.8182u 240.7856u 240.7856u -481.6363u
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ibs 27.7495f 27.7495f -4.826e-19 -4.826e-19 50.5859a
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ibd 27.7495f 27.7495f -32.5594n -32.5594n 562.1908f
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vgs -1.6291 -1.6291 1.0000 1.0000 -670.8606m
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vds -431.9608m -431.9608m 2.1972 2.1972 -670.8606m
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vbs 670.8606m 670.8606m 0. 0. 0.
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vth -648.2058m -648.2058m 483.1962m 483.1962m -458.6354m
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vdsat -809.0935m -809.0935m 476.0168m 476.0168m -204.2288m
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beta 798.1469u 798.1469u 1.8916m 1.8916m 21.3671m
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gam eff 471.4654m 471.4654m 517.3875m 517.3875m 497.9476m
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gm 267.1075u 267.1075u 765.1671u 765.1671u 3.8578m
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gds 363.5742u 363.5742u 3.1814u 3.1814u 22.5359u
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gmb 99.4698u 99.4698u 228.8685u 228.8685u 1.2749m
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cdtot 96.5215f 96.5215f 4.7983f 4.7983f 371.1814f
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cgtot 129.8446f 129.8446f 33.1464f 33.1464f 1.9566p
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cstot 123.3593f 123.3593f 41.7131f 41.7131f 2.5406p
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cbtot 52.6108f 52.6108f 18.6504f 18.6504f 1.3034p
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cgs 77.8780f 77.8780f 28.1644f 28.1644f 1.6472p
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cgd 50.9572f 50.9572f 1.8252f 1.8252f 98.1048f
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//
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[
本帖最後由 stevenzhou 於 2007-12-30 09:07 PM 編輯
]
作者:
stevenzhou
時間:
2007-12-30 11:34 PM
folded-cascade opamp
% C0 R( u% x+ E; O8 X
+ V8 ^5 `, z0 ?: ~9 X* b5 F1 o
.prot
/ ^6 o& C% a9 C
.lib 'mm018.l' TT
: ~9 H/ ~5 G2 c8 c) I4 N: c! I
.unprot
( ]/ H! H# M6 `1 G! |
% B6 y6 Y) \* s, i" E
VDD vdd 0 DC 3.3v
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VIN+ vin+ 0 DC 0.5v AC 1V
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VIN- vin- 0 DC 0.5v
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VBIASP vbiasp 1 DC 0v
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VBIASN vbiasn 0 DC 0.88v
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m1 7 vin- 1 vdd pch w=15u l=1u m=1
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m2 6 vin+ 1 vdd pch w=15u l=1u m=1
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M9 7 vbiasn 0 0 nch W=5u L=1u m=1
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M10 6 vbiasn 0 0 nch W=5u L=1u m=1
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M11 1 vbiasp vdd vdd pch W=15u L=1u m=1
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.op
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.end
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//
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1 ****** HSPICE -- U-2003.09-SP1 (20031115) 23:20:01 12/30/2007 pcnt
( T0 ?0 F% |; m" O0 `
******
}6 o: ~3 [$ d1 P$ q
folded-cascade opamp
_& f+ ?9 b. {: c0 O* q) _, R
****** operating point information tnom= 25.000 temp= 25.000
$ t6 ]/ _* J4 W H3 A& b$ E" Q
******
$ S! O z- R! w+ f% P
***** operating point status is all simulation time is 0.
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node =voltage node =voltage node =voltage
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+0:1 = 1.9514 0:6 = 572.9837m 0:7 = 572.9837m
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+0:vbiasn = 880.0000m 0:vbiasp = 1.9514 0:vdd = 3.3000
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+0:vin+ = 500.0000m 0:vin- = 500.0000m
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**** voltage sources
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subckt
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element 0:vdd 0:vin+ 0:vin- 0:vbiasp 0:vbiasn
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volts 3.3000 500.0000m 500.0000m 0. 880.0000m
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current -298.0119u 0. 0. 0. 0.
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power 983.4394u 0. 0. 0. 0.
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total voltage source power dissipation= 983.4394u watts
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**** mosfets
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- a5 |( y u6 N0 [
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subckt
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element 0:m1 0:m2 0:m9 0:m10 0:m11
x! E- t" [& U+ D" J- `0 E9 T/ d
model 0:pch.2 0:pch.2 0:nch.5 0:nch.5 0:pch.2
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region Saturati Saturati Saturati Saturati Saturati
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id -149.0060u -149.0060u 149.0060u 149.0060u -298.0119u
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ibs 27.7495f 27.7495f -2.988e-19 -2.988e-19 30.8833a
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ibd 27.8713f 27.8713f -189.5634a -189.5634a 27.7498f
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vgs -1.4514 -1.4514 880.0000m 880.0000m -1.3486
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vds -1.3784 -1.3784 572.9837m 572.9837m -1.3486
! \% g, Q2 A; d: m2 Z- W
vbs 1.3486 1.3486 0. 0. 0.
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vth -804.9352m -804.9352m 483.5635m 483.5635m -458.4947m
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vdsat -562.7348m -562.7348m 384.0604m 384.0604m -707.9220m
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beta 786.5353u 786.5353u 1.9473m 1.9473m 908.9518u
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gam eff 455.9316m 455.9316m 517.3876m 517.3876m 490.7250m
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gm 399.4882u 399.4882u 626.4651u 626.4651u 567.1552u
) F7 ]: R9 |4 P+ y* e
gds 3.3727u 3.3727u 13.5609u 13.5609u 7.0085u
; \1 w2 s9 k7 O* s
gmb 104.1632u 104.1632u 183.7342u 183.7342u 204.2159u
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cdtot 14.6309f 14.6309f 5.7615f 5.7615f 16.6723f
0 p1 a% r5 X1 f+ B0 {; e; o
cgtot 97.3463f 97.3463f 33.1397f 33.1397f 98.6312f
# U1 e0 y6 m% Y m# f% Z) g1 }
cstot 114.2711f 114.2711f 41.7018f 41.7018f 128.3842f
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cbtot 43.1833f 43.1833f 19.6812f 19.6812f 61.7252f
+ ^6 @( c8 a4 F) O4 t6 x& v
cgs 85.8953f 85.8953f 28.0877f 28.0877f 84.7928f
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cgd 4.9102f 4.9102f 1.8252f 1.8252f 4.9102f
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//
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發現是我的bias電壓不對 導致在triode region 看過這個論壇其他有關OP的文章 果然有幫助ㄋ
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[
本帖最後由 stevenzhou 於 2007-12-30 11:39 PM 編輯
]
作者:
andywu
時間:
2007-12-31 10:16 AM
想請問spice模擬的電晶體 工作在saturation region 的條件為何?
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在VGS>Vth的條件下,當VDS=VGS-Vth時,MOS剛好達到飽和狀態的條件,若VDS>VGS-Vth,MOS就進入飽和區工作。如果VDS<VGS-Vth,那麼MOS便在線性區工作。反過來說,若VGS<Vth,MOS就工作在截止區,此時通道截止且無電流通過,可視為開關在開路的狀態。
作者:
et2234
時間:
2007-12-31 07:13 PM
請加共模回授 就可以了
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因為你用的是全差動對的
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下次請附圖
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